p_mobj.cpp

//-----------------------------------------------------------------------------
//
// Copyright 1993-1996 id Software
// Copyright 1994-1996 Raven Software
// Copyright 1998-1998 Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
// Copyright 1999-2016 Randy Heit
// Copyright 2002-2017 Christoph Oelckers
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see http://www.gnu.org/licenses/
//
//-----------------------------------------------------------------------------
//
// DESCRIPTION:
//		Moving object handling. Spawn functions.
//
//-----------------------------------------------------------------------------

/* For code that originates from ZDoom the following applies:
**
**---------------------------------------------------------------------------
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/

// HEADER FILES ------------------------------------------------------------
#include <float.h>


#include "m_random.h"
#include "doomdef.h"
#include "p_local.h"
#include "p_maputl.h"
#include "p_lnspec.h"
#include "p_effect.h"
#include "p_terrain.h"
#include "hu_stuff.h"
#include "v_video.h"
#include "c_dispatch.h"
#include "b_bot.h"	//Added by MC:
#include "a_sharedglobal.h"
#include "gi.h"
#include "sbar.h"
#include "p_acs.h"
#include "cmdlib.h"
#include "decallib.h"
#include "a_keys.h"
#include "p_conversation.h"
#include "g_game.h"
#include "teaminfo.h"
#include "r_sky.h"
#include "d_event.h"
#include "p_enemy.h"
#include "gstrings.h"
#include "po_man.h"
#include "p_spec.h"
#include "p_checkposition.h"
#include "serializer_doom.h"
#include "serialize_obj.h"
#include "r_utility.h"
#include "thingdef.h"
#include "d_player.h"
#include "g_levellocals.h"
#include "a_morph.h"
#include "events.h"
#include "actorinlines.h"
#include "a_dynlight.h"
#include "fragglescript/t_fs.h"
#include "shadowinlines.h"

// MACROS ------------------------------------------------------------------

#define WATER_SINK_FACTOR		0.125
#define WATER_SINK_SMALL_FACTOR	0.25
#define WATER_SINK_SPEED		0.5
#define WATER_JUMP_SPEED		3.5

// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------

// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------

static void PlayerLandedOnThing (AActor *mo, AActor *onmobj);

// EXTERNAL DATA DECLARATIONS ----------------------------------------------

EXTERN_CVAR (Int,  cl_rockettrails)

// PRIVATE DATA DEFINITIONS ------------------------------------------------

static FRandom pr_explodemissile ("ExplodeMissile");
static FRandom pr_reflect ("Reflect");
static FRandom pr_nightmarerespawn ("NightmareRespawn");
static FRandom pr_botspawnmobj ("BotSpawnActor");
static FRandom pr_spawnmapthing ("SpawnMapThing");
static FRandom pr_spawnpuff ("SpawnPuff");
static FRandom pr_spawnblood ("SpawnBlood");
static FRandom pr_splatter ("BloodSplatter");
static FRandom pr_takedamage ("TakeDamage");
static FRandom pr_splat ("FAxeSplatter");
static FRandom pr_ripperblood ("RipperBlood");
static FRandom pr_chunk ("Chunk");
static FRandom pr_checkmissilespawn ("CheckMissileSpawn");
static FRandom pr_missiledamage ("MissileDamage");
static FRandom pr_multiclasschoice ("MultiClassChoice");
static FRandom pr_rockettrail("RocketTrail");
static FRandom pr_uniquetid("UniqueTID");

// PUBLIC DATA DEFINITIONS -------------------------------------------------

FRandom pr_spawnmobj ("SpawnActor");
FRandom pr_bounce("Bounce");
FRandom pr_spawnmissile("SpawnMissile");

CUSTOM_CVAR (Float, sv_gravity, 800.f, CVAR_SERVERINFO|CVAR_NOSAVE|CVAR_NOINITCALL)
{
	for (auto Level : AllLevels())
	{
		Level->gravity = self;
	}
}

CVAR (Bool, cl_missiledecals, true, CVAR_ARCHIVE)
CVAR (Bool, addrocketexplosion, false, CVAR_ARCHIVE)
CVAR (Int, cl_pufftype, 0, CVAR_ARCHIVE);
CVAR (Int, cl_bloodtype, 0, CVAR_ARCHIVE);

// CODE --------------------------------------------------------------------

IMPLEMENT_CLASS(DActorModelData, false, false);
IMPLEMENT_CLASS(AActor, false, true)

IMPLEMENT_POINTERS_START(AActor)
	IMPLEMENT_POINTER(target)
	IMPLEMENT_POINTER(lastenemy)
	IMPLEMENT_POINTER(tracer)
	IMPLEMENT_POINTER(goal)
	IMPLEMENT_POINTER(LastLookActor)
	IMPLEMENT_POINTER(Inventory)
	IMPLEMENT_POINTER(LastHeard)
	IMPLEMENT_POINTER(master)
	IMPLEMENT_POINTER(Poisoner)
	IMPLEMENT_POINTER(alternative)
	IMPLEMENT_POINTER(ViewPos)
	IMPLEMENT_POINTER(modelData)
	IMPLEMENT_POINTER(boneComponentData)
IMPLEMENT_POINTERS_END

//==========================================================================
//
// AActor :: Serialize
//
//==========================================================================

#define A(a,b) ((a), (b), def->b)

void AActor::Serialize(FSerializer &arc)
{
	AActor *def = GetDefault();

	Super::Serialize(arc);

	arc
		.Sprite("sprite", sprite, &def->sprite)
		A("pos", __Pos)
		A("angles", Angles)
		A("frame", frame)
		A("scale", Scale)
		A("renderstyle", RenderStyle)
		A("renderflags", renderflags)
		A("renderflags2", renderflags2)
		A("picnum", picnum)
		A("floorpic", floorpic)
		A("ceilingpic", ceilingpic)
		A("tidtohate", TIDtoHate)
		A("lastlookpn", LastLookPlayerNumber)
		("lastlookactor", LastLookActor)
		A("effects", effects)
		A("fountaincolor", fountaincolor)
		A("alpha", Alpha)
		A("fillcolor", fillcolor)
		A("sector", Sector)
		A("floorz", floorz)
		A("ceilingz", ceilingz)
		A("dropoffz", dropoffz)
		A("floorsector", floorsector)
		A("ceilingsector", ceilingsector)
		A("radius", radius)
		A("renderradius", renderradius)
		A("height", Height)
		A("ppassheight", projectilepassheight)
		A("vel", Vel)
		A("tics", tics)
		A("state", state)
		A("damage", DamageVal)
		A("projectilekickback", projectileKickback)
		A("flags", flags)
		A("flags2", flags2)
		A("flags3", flags3)
		A("flags4", flags4)
		A("flags5", flags5)
		A("flags6", flags6)
		A("flags7", flags7)
		A("flags8", flags8)
		A("flags9", flags9)
		A("weaponspecial", weaponspecial)
		A("special1", special1)
		A("special2", special2)
		A("specialf1", specialf1)
		A("specialf2", specialf2)
		A("health", health)
		A("movedir", movedir)
		A("visdir", visdir)
		A("movecount", movecount)
		A("strafecount", strafecount)
		("target", target)
		("lastenemy", lastenemy)
		("lastheard", LastHeard)
		A("reactiontime", reactiontime)
		A("threshold", threshold)
		A("player", player)
		A("spawnpoint", SpawnPoint)
		A("spawnangle", SpawnAngle)
		A("starthealth", StartHealth)
		A("skillrespawncount", skillrespawncount)
		("tracer", tracer)
		A("floorclip", Floorclip)
		A("tid", tid)
		A("special", special)
		A("accuracy", accuracy)
		A("stamina", stamina)
		("goal", goal)
		A("waterlevel", waterlevel)
		A("boomwaterlevel", boomwaterlevel)
		A("minmissilechance", MinMissileChance)
		A("spawnflags", SpawnFlags)
		("inventory", Inventory)
		A("inventoryid", InventoryID)
		A("floatbobphase", FloatBobPhase)
		A("floatbobstrength", FloatBobStrength)
		A("translation", Translation)
		A("bloodcolor", BloodColor)
		A("bloodtranslation", BloodTranslation)
		A("seesound", SeeSound)
		A("attacksound", AttackSound)
		A("paimsound", PainSound)
		A("deathsound", DeathSound)
		A("activesound", ActiveSound)
		A("usesound", UseSound)
		A("bouncesound", BounceSound)
		A("wallbouncesound", WallBounceSound)
		A("crushpainsound", CrushPainSound)
		A("speed", Speed)
		A("floatspeed", FloatSpeed)
		A("mass", Mass)
		A("painchance", PainChance)
		A("spawnstate", SpawnState)
		A("seestate", SeeState)
		A("meleestate", MeleeState)
		A("missilestate", MissileState)
		A("maxdropoffheight", MaxDropOffHeight)
		A("maxslopesteepness", MaxSlopeSteepness)
		A("maxstepheight", MaxStepHeight)
		A("bounceflags", BounceFlags)
		A("bouncefactor", bouncefactor)
		A("wallbouncefactor", wallbouncefactor)
		A("bouncecount", bouncecount)
		A("maxtargetrange", maxtargetrange)
		A("meleethreshold", meleethreshold)
		A("meleerange", meleerange)
		A("damagetype", DamageType)
		A("damagetypereceived", DamageTypeReceived)
		A("paintype", PainType)
		A("deathtype", DeathType)
		A("gravity", Gravity)
		A("fastchasestrafecount", FastChaseStrafeCount)
		("master", master)
		A("smokecounter", smokecounter)
		("blockingmobj", BlockingMobj)
		A("blockingline", BlockingLine)
		A("movementblockingline", MovementBlockingLine)
		A("blocking3dfloor", Blocking3DFloor)
		A("blockingceiling", BlockingCeiling)
		A("blockingfloor", BlockingFloor)
		A("visibletoteam", VisibleToTeam)
		A("pushfactor", pushfactor)
		A("species", Species)
		A("score", Score)
		A("designatedteam", DesignatedTeam)
		A("lastpush", lastpush)
		A("activationtype", activationtype)
		A("lastbump", lastbump)
		A("painthreshold", PainThreshold)
		A("damagefactor", DamageFactor)
		A("damagemultiply", DamageMultiply)
		A("waveindexxy", WeaveIndexXY)
		A("weaveindexz", WeaveIndexZ)
		A("freezetics", freezetics)
		A("pdmgreceived", PoisonDamageReceived)
		A("pdurreceived", PoisonDurationReceived)
		A("ppreceived", PoisonPeriodReceived)
		("poisoner", Poisoner)
		A("posiondamage", PoisonDamage)
		A("poisonduration", PoisonDuration)
		A("poisonperiod", PoisonPeriod)
		A("poisondamagetype", PoisonDamageType)
		A("poisondmgtypereceived", PoisonDamageTypeReceived)
		A("conversationroot", ConversationRoot)
		A("conversation", Conversation)
		A("friendplayer", FriendPlayer)
		A("telefogsourcetype", TeleFogSourceType)
		A("telefogdesttype", TeleFogDestType)
		A("ripperlevel", RipperLevel)
		A("riplevelmin", RipLevelMin)
		A("riplevelmax", RipLevelMax)
		A("devthreshold", DefThreshold)
		A("spriteangle", SpriteAngle)
		A("spriterotation", SpriteRotation)
		("alternative", alternative)
		A("thrubits", ThruBits)
		A("cameraheight", CameraHeight)
		A("camerafov", CameraFOV)
		A("tag", Tag)
		A("visiblestartangle", VisibleStartAngle)
		A("visibleendangle", VisibleEndAngle)
		A("visiblestartpitch", VisibleStartPitch)
		A("visibleendpitch", VisibleEndPitch)
		A("woundhealth", WoundHealth)
		A("rdfactor", RadiusDamageFactor)
		A("selfdamagefactor", SelfDamageFactor)
		A("stealthalpha", StealthAlpha)
		A("renderhidden", RenderHidden)
		A("renderrequired", RenderRequired)
		A("friendlyseeblocks", friendlyseeblocks)
		A("viewangles", ViewAngles)
		A("spawntime", SpawnTime)
		A("spawnorder", SpawnOrder)
		A("friction", Friction)
		A("SpriteOffset", SpriteOffset)
		("viewpos", ViewPos)
		A("lightlevel", LightLevel)
		A("userlights", UserLights)
		A("WorldOffset", WorldOffset)
		("modelData", modelData);

		SerializeTerrain(arc, "floorterrain", floorterrain, &def->floorterrain);
		SerializeArgs(arc, "args", args, def->args, special);

}

#undef A

//==========================================================================
//
// This must be done after the world is set up.
//
//==========================================================================

void AActor::PostSerialize()
{
	touching_sectorlist = nullptr;
	touching_rendersectors = nullptr;
	LinkToWorld(nullptr, false, Sector);

	AddToHash();
	if (player)
	{
		if (Level->PlayerInGame(player) &&
			player->cls != NULL &&
			!(flags4 & MF4_NOSKIN) &&
			state->sprite == GetDefaultByType(player->cls)->SpawnState->sprite)
		{ // Give player back the skin
			sprite = Skins[player->userinfo.GetSkin()].sprite;
		}
		if (Speed == 0)
		{
			Speed = GetDefault()->Speed;
		}
	}
	ClearInterpolation();
	ClearFOVInterpolation();
	UpdateWaterLevel(false);
}


//==========================================================================
//
// AActor::InStateSequence
//
// Checks whether the current state is in a contiguous sequence that
// starts with basestate
//
//==========================================================================

static int InStateSequence(FState * newstate, FState * basestate)
{
	if (basestate == NULL) return false;

	FState * thisstate = basestate;
	do
	{
		if (newstate == thisstate) return true;
		basestate = thisstate;
		thisstate = thisstate->GetNextState();
	}
	while (thisstate == basestate+1);
	return false;
}

DEFINE_ACTION_FUNCTION_NATIVE(AActor, InStateSequence, InStateSequence)
{
	PARAM_PROLOGUE;
	PARAM_POINTER(newstate, FState);
	PARAM_POINTER(basestate, FState);
	ACTION_RETURN_BOOL(InStateSequence(newstate, basestate));
}

DEFINE_ACTION_FUNCTION_NATIVE(FState, InStateSequence, InStateSequence)
{
	PARAM_SELF_STRUCT_PROLOGUE(FState);
	PARAM_POINTER(basestate, FState);
	ACTION_RETURN_BOOL(InStateSequence(self, basestate));
}


bool AActor::IsMapActor()
{
	// [SP] Don't remove owned inventory objects.
	return (!IsKindOf(NAME_Inventory) || GC::ReadBarrier(PointerVar<AActor>(NAME_Owner)) == nullptr);
}

//==========================================================================
//
// AActor::GetTics
//
// Get the actual duration of the next state
// We are using a state flag now to indicate a state that should be
// accelerated in Fast mode or slowed in Slow mode.
//
//==========================================================================

inline int GetTics(AActor* actor, FState * newstate)
{
	int tics = newstate->GetTics();
	if (actor->isFast() && newstate->GetFast())
	{
		return tics - (tics>>1);
	}
	else if (actor->isSlow() && newstate->GetSlow())
	{
		return tics<<1;
	}
	return tics;
}

//==========================================================================
//
// AActor::SetState
//
// Returns true if the mobj is still present.
//
//==========================================================================

bool AActor::SetState (FState *newstate, bool nofunction)
{
	if (debugfile && player && (player->cheats & CF_PREDICTING))
		fprintf (debugfile, "for pl %d: SetState while predicting!\n", Level->PlayerNum(player));
	
	auto oldstate = state;
	do
	{
		if (newstate == NULL)
		{
			state = NULL;
			Destroy ();
			return false;
		}
		int prevsprite, newsprite;

		if (state != NULL)
		{
			prevsprite = state->sprite;
		}
		else
		{
			prevsprite = -1;
		}
		if (!(newstate->UseFlags & SUF_ACTOR))
		{
			Printf(TEXTCOLOR_RED "State %s in %s not flagged for use as an actor sprite\n", FState::StaticGetStateName(newstate).GetChars(), GetClass()->TypeName.GetChars());
			state = nullptr;
			Destroy();
			return false;
		}
		state = newstate;
		tics = GetTics(this, newstate);
		renderflags = (renderflags & ~RF_FULLBRIGHT) | ActorRenderFlags::FromInt (newstate->GetFullbright());
		newsprite = newstate->sprite;
		if (newsprite != SPR_FIXED)
		{ // okay to change sprite and/or frame
			if (!newstate->GetSameFrame())
			{ // okay to change frame
				frame = newstate->GetFrame();
			}
			if (newsprite != SPR_NOCHANGE)
			{ // okay to change sprite
				if (!(flags4 & MF4_NOSKIN) && newsprite == SpawnState->sprite)
				{ // [RH] If the new sprite is the same as the original sprite, and
				// this actor is attached to a player, use the player's skin's
				// sprite. If a player is not attached, do not change the sprite
				// unless it is different from the previous state's sprite; a
				// player may have been attached, died, and respawned elsewhere,
				// and we do not want to lose the skin on the body. If it wasn't
				// for Dehacked, I would move sprite changing out of the states
				// altogether, since actors rarely change their sprites after
				// spawning.
					if (player != NULL && Skins.Size() > 0)
					{
						sprite = Skins[player->userinfo.GetSkin()].sprite;
					}
					else if (newsprite != prevsprite)
					{
						sprite = newsprite;
					}
				}
				else
				{
					sprite = newsprite;
				}
			}
		}

		if (!nofunction)
		{
			FState *returned_state;
			FStateParamInfo stp = { newstate, STATE_Actor, PSP_WEAPON };
			if (newstate->CallAction(this, this, &stp, &returned_state))
			{
				// Check whether the called action function resulted in destroying the actor
				if (ObjectFlags & OF_EuthanizeMe)
				{
					return false;
				}
				if (returned_state != NULL)
				{ // The action was an A_Jump-style function that wants to change the next state.
					newstate = returned_state;
					tics = 0;		 // make sure we loop and set the new state properly
					continue;
				}
			}
		}
		newstate = newstate->GetNextState();
	} while (tics == 0);

	if (GetInfo()->LightAssociations.Size() || (state && state->Light > 0) || (oldstate && oldstate->Light > 0))
	{
		flags8 |= MF8_RECREATELIGHTS;
		Level->flags3 |= LEVEL3_LIGHTCREATED;
	}
	return true;
}

DEFINE_ACTION_FUNCTION(AActor, SetState)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_POINTER(state, FState);
	PARAM_BOOL(nofunction);
	ACTION_RETURN_BOOL(self->SetState(state, nofunction));
};


//============================================================================
//
// DestroyAllInventory
// Destroys all the inventory the actor is holding.
//
//============================================================================

static void DestroyAllInventory(AActor* actor)
{
	AActor *inv = PARAM_NULLCHECK(actor, self)->Inventory;
	if (inv != nullptr)
	{
		TArray<AActor *> toDelete;

		// Delete the list in a two stage approach.
		// This is necessary because an item may destroy another item (e.g. sister weapons)
		// which would break the list and leave parts of it undestroyed, maybe doing bad things later.
		while (inv != nullptr)
		{
			toDelete.Push(inv);
			auto item = inv->Inventory;
			inv->Inventory = nullptr;
			inv->PointerVar<AActor>(NAME_Owner) = nullptr;
			inv = item;
		}
		for (auto p : toDelete)
		{
			// the item may already have been deleted by another one, so check this here to avoid problems.
			if (!(p->ObjectFlags & OF_EuthanizeMe))
			{
				p->Destroy();
			}
		}
	}
}

DEFINE_ACTION_FUNCTION_NATIVE(AActor, DestroyAllInventory, DestroyAllInventory)
{
	PARAM_SELF_PROLOGUE(AActor);
	DestroyAllInventory(self);
	return 0;
}
//============================================================================
//
// AActor :: UseInventory
//
// Attempts to use an item. If the use succeeds, one copy of the item is
// removed from the inventory. If all copies are removed, then the item is
// destroyed.
//
//============================================================================

bool AActor::UseInventory (AActor *item)
{
	IFVIRTUAL(AActor, UseInventory)
	{
		VMValue params[] = { this, item };
		int retval = 0;
		VMReturn ret(&retval);
		VMCall(func, params, 2, &ret, 1);
		return !!retval;
	}
	return false;
}

//===========================================================================
//
// AActor :: DropInventory
//
// Removes a single copy of an item and throws it out in front of the actor.
//
//===========================================================================

AActor *AActor::DropInventory (AActor *item, int amt)
{
	IFVM(Actor, DropInventory)
	{
		VMValue params[] = { this, item, amt };
		AActor *retval = 0;
		VMReturn ret((void**)&retval);
		VMCall(func, params, 3, &ret, 1);
		return retval;
	}
	return nullptr;
}

//============================================================================
//
// AActor :: FindInventory
//
//============================================================================

AActor *AActor::FindInventory (PClassActor *type, bool subclass)
{
	AActor *item;

	if (type == NULL)
	{
		return NULL;
	}
	for (item = Inventory; item != NULL; item = item->Inventory)
	{
		if (!subclass)
		{
			if (item->GetClass() == type)
			{
				break;
			}
		}
		else
		{
			if (item->IsKindOf(type))
			{
				break;
			}
		}
	}
	return item;
}

AActor *AActor::FindInventory (FName type, bool subclass)
{
	return FindInventory(PClass::FindActor(type), subclass);
}

DEFINE_ACTION_FUNCTION(AActor, FindInventory)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_CLASS(type, AActor);
	PARAM_BOOL(subclass);
	ACTION_RETURN_OBJECT(self->FindInventory(type, subclass));
}

//============================================================================
//
// AActor :: GiveInventoryType
//
//============================================================================

AActor *AActor::GiveInventoryType (PClassActor *type)
{
	if (type != nullptr)
	{
		auto item = Spawn (Level, type);
		if (!CallTryPickup (item, this))
		{
			item->Destroy ();
			return nullptr;
		}
		return item;
	}
	return nullptr;
}

DEFINE_ACTION_FUNCTION(AActor, GiveInventoryType)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_CLASS(type, AActor);
	ACTION_RETURN_OBJECT(self->GiveInventoryType(type));
}

//============================================================================
//
// AActor :: CopyFriendliness
//
// Makes this actor hate (or like) the same things another actor does.
//
//============================================================================

void AActor::CopyFriendliness (AActor *other, bool changeTarget, bool resetHealth)
{
	Level->total_monsters -= CountsAsKill();
	TIDtoHate = other->TIDtoHate;
	LastLookActor = other->LastLookActor;
	LastLookPlayerNumber = other->LastLookPlayerNumber;
	flags  = (flags & ~MF_FRIENDLY) | (other->flags & MF_FRIENDLY);
	flags3 = (flags3 & ~(MF3_NOSIGHTCHECK | MF3_HUNTPLAYERS)) | (other->flags3 & (MF3_NOSIGHTCHECK | MF3_HUNTPLAYERS));
	flags4 = (flags4 & ~(MF4_NOHATEPLAYERS | MF4_BOSSSPAWNED)) | (other->flags4 & (MF4_NOHATEPLAYERS | MF4_BOSSSPAWNED));
	FriendPlayer = other->FriendPlayer;
	DesignatedTeam = other->DesignatedTeam;
	if (changeTarget && other->target != NULL && !(other->target->flags3 & MF3_NOTARGET) && !(other->target->flags7 & MF7_NEVERTARGET))
	{
		// LastHeard must be set as well so that A_Look can react to the new target if called
		LastHeard = target = other->target;
	}	
	if (resetHealth) health = SpawnHealth();	
	Level->total_monsters += CountsAsKill();
}

DEFINE_ACTION_FUNCTION(AActor, CopyFriendliness)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT_NOT_NULL(other, AActor);
	PARAM_BOOL(changetarget);
	PARAM_BOOL(resethealth);
	self->CopyFriendliness(other, changetarget, resethealth);
	return 0;
}
//---------------------------------------------------------------------------
//
// FUNC P_GetRealMaxHealth
//
// Taken out of P_GiveBody so that the bot code can also use it to decide
// whether to pick up an item or not.
//
//---------------------------------------------------------------------------

int P_GetRealMaxHealth(AActor *actor, int max)
{
	// Max is 0 by default, preserving default behavior for P_GiveBody()
	// calls while supporting health pickups.
	auto player = actor->player;
	if (max <= 0)
	{
		max = actor->GetMaxHealth(true);
		// [MH] First step in predictable generic morph effects
		if (player->morphTics)
		{
			if (player->MorphStyle & MORPH_FULLHEALTH)
			{
				if (!(player->MorphStyle & MORPH_ADDSTAMINA))
				{
					max -= actor->stamina + actor->IntVar(NAME_BonusHealth);
				}
			}
			else // old health behaviour
			{
				max = MAXMORPHHEALTH;
				if (player->MorphStyle & MORPH_ADDSTAMINA)
				{
					max += actor->stamina + actor->IntVar(NAME_BonusHealth);
				}
			}
		}
	}
	else
	{
		// Bonus health should be added on top of the item's limit.
		if (player->morphTics == 0 || (player->MorphStyle & MORPH_ADDSTAMINA))
		{
			max += actor->IntVar(NAME_BonusHealth);
		}
	}
	return max;
}

//---------------------------------------------------------------------------
//
// FUNC P_GiveBody
//
// Returns false if the body isn't needed at all.
//
//---------------------------------------------------------------------------

bool P_GiveBody(AActor *actor, int num, int max)
{
	if (actor->health <= 0 || (actor->player != NULL && actor->player->playerstate == PST_DEAD))
	{ // Do not heal dead things.
		return false;
	}

	player_t *player = actor->player;

	num = clamp(num, -65536, 65536);	// prevent overflows for bad values
	if (player != NULL)
	{
		max = P_GetRealMaxHealth(player->mo, max);	// do not pass voodoo dolls in here.
		// [RH] For Strife: A negative value sets you up with a percentage of your full health.
		if (num < 0)
		{
			num = max * -num / 100;
			if (player->health < num)
			{
				player->health = num;
				actor->health = num;
				return true;
			}
		}
		else if (num > 0)
		{
			if (player->health < max)
			{
				num = int(num * G_SkillProperty(SKILLP_HealthFactor));
				if (num < 1) num = 1;
				player->health += num;
				if (player->health > max)
				{
					player->health = max;
				}
				actor->health = player->health;
				return true;
			}
		}
	}
	else
	{
		// Parameter value for max is ignored on monsters, preserving original
		// behaviour of health as well as on existing calls to P_GiveBody().
		max = actor->SpawnHealth();
		if (num < 0)
		{
			num = max * -num / 100;
			if (actor->health < num)
			{
				actor->health = num;
				return true;
			}
		}
		else if (actor->health < max)
		{
			actor->health += num;
			if (actor->health > max)
			{
				actor->health = max;
			}
			return true;
		}
	}
	return false;
}

DEFINE_ACTION_FUNCTION(AActor, GiveBody)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_INT(num);
	PARAM_INT(max);
	ACTION_RETURN_BOOL(P_GiveBody(self, num, max));
}

//============================================================================
//
// AActor :: CheckLocalView
//
// Returns true if this actor is local for the player. Here, local means the
// player is either looking out this actor's eyes, or this actor is the player
// and the player is looking out the eyes of something non-"sentient."
//
//============================================================================

bool AActor::CheckLocalView() const
{
	auto p = Level->GetConsolePlayer();
	if (p == nullptr)
	{
		return false;
	}
	if (p->camera == this)
	{
		return true;
	}
	if (p->mo != this || p->camera == nullptr)
	{
		return false;
	}
	if (p->camera->player == NULL &&
		!(p->camera->flags3 & MF3_ISMONSTER))
	{
		return true;
	}
	return false;
}

DEFINE_ACTION_FUNCTION(AActor, CheckLocalView)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_INT(cp);
	ACTION_RETURN_BOOL(self->CheckLocalView());
}

void AActor::DisableLocalRendering(const unsigned int pNum, const bool disable)
{
	if (pNum == consoleplayer)
		NoLocalRender = disable;
}

static void DisableLocalRendering(AActor* const self, const unsigned int pNum, const int disable)
{
	self->DisableLocalRendering(pNum, disable);
}

DEFINE_ACTION_FUNCTION_NATIVE(AActor, DisableLocalRendering, DisableLocalRendering)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_UINT(pNum);
	PARAM_INT(disable);

	DisableLocalRendering(self, pNum, disable);
}

bool AActor::ShouldRenderLocally() const
{
	return !NoLocalRender;
}

static int ShouldRenderLocally(const AActor* const self)
{
	return self->ShouldRenderLocally();
}

DEFINE_ACTION_FUNCTION_NATIVE(AActor, ShouldRenderLocally, ShouldRenderLocally)
{
	PARAM_SELF_PROLOGUE(AActor);

	ACTION_RETURN_INT(ShouldRenderLocally(self));
}

//============================================================================
//
// AActor :: IsInsideVisibleAngles
//
// Returns true if this actor is within viewing angle/pitch visibility. 
//
//============================================================================

bool AActor::IsInsideVisibleAngles() const
{
	// Don't bother masking if not wanted.
	if (!(renderflags & RF_MASKROTATION))
		return true;
	
	auto p = Level->GetConsolePlayer();

	if (p == nullptr || p->camera == nullptr)
		return true;
	
	DAngle anglestart = DAngle::fromDeg(VisibleStartAngle.Degrees());
	DAngle angleend = DAngle::fromDeg(VisibleEndAngle.Degrees());
	DAngle pitchstart = DAngle::fromDeg(VisibleStartPitch.Degrees());
	DAngle pitchend = DAngle::fromDeg(VisibleEndPitch.Degrees());
	
	if (anglestart > angleend)
	{
		DAngle temp = anglestart;
		anglestart = angleend;
		angleend = temp;
	}

	if (pitchstart > pitchend)
	{
		DAngle temp = pitchstart;
		pitchstart = pitchend;
		pitchend = temp;
	}
	

	AActor *mo = p->camera;

	if (mo != nullptr)
	{
		DVector2 offset = Level->Displacements.getOffset(r_viewpoint.sector->PortalGroup, Sector->PortalGroup);
		DVector3 diffang = r_viewpoint.Pos + offset - Pos();
		DAngle to = diffang.Angle();

		if (!(renderflags & RF_ABSMASKANGLE)) 
			to = deltaangle(Angles.Yaw, to);

		if ((to >= anglestart && to <= angleend))
		{
			to = diffang.Pitch();
			if (!(renderflags & RF_ABSMASKPITCH))
				to = deltaangle(Angles.Pitch, to);

			return !!(to >= pitchstart && to <= pitchend);
		}
		else return false;
	}
	return true;
}

//============================================================================
//
// AActor :: IsVisibleToPlayer
//
// Returns true if this actor should be seen by the console player.
//
// Not that even for secondary maps this must check the real player!
//
//============================================================================

bool AActor::IsVisibleToPlayer() const
{
	auto p = Level->GetConsolePlayer();
	// [BB] Safety check. This should never be NULL. Nevertheless, we return true to leave the default ZDoom behavior unaltered.
	if (p == nullptr || p->camera == nullptr )
		return true;

	if (!ShouldRenderLocally())
		return false;
 
	if (VisibleToTeam != 0 && teamplay &&
		(signed)(VisibleToTeam-1) != p->userinfo.GetTeam() )
		return false;

	auto &vis = GetInfo()->VisibleToPlayerClass;
	if (vis.Size() == 0) return true;	// early out for the most common case.

	const player_t* pPlayer = p->camera->player;

	if (pPlayer)
	{
		for(auto cls : vis)
		{
			if (cls && pPlayer->mo->GetClass()->IsDescendantOf(cls))
			{
				return true;
			}
		}
		return false;
	}

	// [BB] Passed all checks.
	return true;
}

//============================================================================
//
// AActor :: ConversationAnimation
//
// Plays a conversation-related animation:
//	 0 = greeting
//   1 = "yes"
//   2 = "no"
//
//============================================================================

void AActor::ConversationAnimation (int animnum)
{
	FState * state = NULL;
	switch (animnum)
	{
	case 0:
		state = FindState(NAME_Greetings);
		break;
	case 1:
		state = FindState(NAME_Yes);
		break;
	case 2:
		state = FindState(NAME_No);
		break;
	}
	if (state != NULL) SetState(state);
}

//============================================================================
//
// AActor :: Touch
//
// Something just touched this actor. Normally used only for inventory items,
// but some Strife monsters also use it.
//
//============================================================================

void AActor::CallTouch(AActor *toucher)
{
	IFVIRTUAL(AActor, Touch)
	{
		VMValue params[2] = { (DObject*)this, toucher };
		VMCall(func, params, 2, nullptr, 0);
	}
}

//============================================================================
//
// AActor :: Grind
//
// Handles the an actor being crushed by a door, crusher or polyobject.
// Originally part of P_DoCrunch(), it has been made into its own actor
// function so that it could be called from a polyobject without hassle.
// Bool items is true if it should destroy() dropped items, false otherwise.
//============================================================================

static int Grind(AActor* actor, int items)
{
	PARAM_NULLCHECK(actor, actor);
	// crunch bodies to giblets
	if ((actor->flags & MF_CORPSE) && !(actor->flags3 & MF3_DONTGIB) && (actor->health <= 0))
	{
		FState * state = actor->FindState(NAME_Crush);

		// In Heretic and Chex Quest we don't change the actor's sprite, just its size.
		if (state == NULL && gameinfo.dontcrunchcorpses)
		{
			actor->flags &= ~MF_SOLID;
			actor->flags3 |= MF3_DONTGIB;
			actor->Height = 0;
			actor->radius = 0;
			actor->Vel.Zero();
			return false;
		}

		bool isgeneric = false;
		// ZDoom behavior differs from standard as crushed corpses cannot be raised.
		// The reason for the change was originally because of a problem with players,
		// see rh_log entry for February 21, 1999. Don't know if it is still relevant.
		if (state == NULL 									// Only use the default crushed state if:
			&& !(actor->flags & MF_NOBLOOD)						// 1. the monster bleeeds,
			&& actor->player == NULL)								// 3. and the thing isn't a player.
		{
			isgeneric = true;
			state = actor->FindState(NAME_GenericCrush);
			if (state != NULL && (sprites[state->sprite].numframes <= 0))
				state = NULL; // If one of these tests fails, do not use that state.
		}
		if (state != NULL && !(actor->flags & MF_ICECORPSE))
		{
			if (actor->flags4 & MF4_BOSSDEATH)
			{
				A_BossDeath(actor);
			}
			actor->flags &= ~MF_SOLID;
			actor->flags3 |= MF3_DONTGIB;
			actor->Height = 0;
			actor->radius = 0;
			actor->Vel.Zero();
			actor->SetState (state);
			if (isgeneric)	// Not a custom crush state, so colorize it appropriately.
			{
				S_Sound (actor, CHAN_BODY, 0, "misc/fallingsplat", 1, ATTN_IDLE);
				actor->Translation = actor->BloodTranslation;
			}
			actor->Level->localEventManager->WorldThingGround(actor, state);
			return false;
		}
		if (!(actor->flags & MF_NOBLOOD))
		{
			if (actor->flags4 & MF4_BOSSDEATH)
			{
				A_BossDeath(actor);
			}

			PClassActor *i = PClass::FindActor("RealGibs");

			if (i != NULL)
			{
				i = i->GetReplacement(actor->Level);

				const AActor *defaults = GetDefaultByType (i);
				if (defaults->SpawnState == NULL ||
					sprites[defaults->SpawnState->sprite].numframes == 0)
				{ 
					i = NULL;
				}
			}
			if (i == NULL)
			{
				// if there's no gib sprite don't crunch it.
				actor->flags &= ~MF_SOLID;
				actor->flags3 |= MF3_DONTGIB;
				actor->Height = 0;
				actor->radius = 0;
				actor->Vel.Zero();
				return false;
			}

			AActor *gib = Spawn (actor->Level, i, actor->Pos(), ALLOW_REPLACE);
			if (gib != NULL)
			{
				gib->RenderStyle = actor->RenderStyle;
				gib->Alpha = actor->Alpha;
				gib->Height = 0;
				gib->radius = 0;
				gib->Translation = actor->BloodTranslation;
			}
			S_Sound (actor, CHAN_BODY, 0, "misc/fallingsplat", 1, ATTN_IDLE);
			actor->Level->localEventManager->WorldThingGround(actor, nullptr);
		}
		if (actor->flags & MF_ICECORPSE)
		{
			actor->tics = 1;
			actor->Vel.Zero();
		}
		else if (actor->player)
		{
			actor->flags |= MF_NOCLIP;
			actor->flags3 |= MF3_DONTGIB;
			actor->renderflags |= RF_INVISIBLE;
		}
		else
		{
			actor->Destroy ();
		}
		return false;		// keep checking
	}

	// killough 11/98: kill touchy things immediately
	if (actor->flags6 & MF6_TOUCHY && (actor->flags6 & MF6_ARMED || actor->IsSentient()))
    {
		actor->flags6 &= ~MF6_ARMED; // Disarm
		P_DamageMobj (actor, NULL, NULL, actor->health, NAME_Crush, DMG_FORCED);  // kill object
		return true;   // keep checking
    }

	if (!(actor->flags & MF_SOLID) || (actor->flags & MF_NOCLIP))
	{
		return false;
	}

	if (!(actor->flags & MF_SHOOTABLE))
	{
		return false;		// assume it is bloody gibs or something
	}
	return true;
}

DEFINE_ACTION_FUNCTION_NATIVE(AActor, Grind, Grind)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_BOOL(items);
	ACTION_RETURN_BOOL(Grind(self, items));
}

bool AActor::CallGrind(bool items)
{
	IFVIRTUAL(AActor, Grind)
	{
		VMValue params[] = { (DObject*)this, items };
		int retv;
		VMReturn ret(&retv);
		VMCall(func, params, 2, &ret, 1);
		return !!retv;
	}
	return false;
}

//============================================================================
//
// AActor :: Massacre
//
// Called by the massacre cheat to kill monsters. Returns true if the monster
// was killed and false if it was already dead.
//============================================================================

bool AActor::Massacre ()
{
	int prevhealth;

	if (health > 0)
	{
		auto f = flags;
		auto f2 = flags2;

		flags |= MF_SHOOTABLE;
		flags2 &= ~(MF2_DORMANT|MF2_INVULNERABLE);
		do
		{
			prevhealth = health;
			P_DamageMobj (this, NULL, NULL, TELEFRAG_DAMAGE, NAME_Massacre);
		}
		while (health != prevhealth && health > 0);	//abort if the actor wasn't hurt.
		if (health > 0)
		{
			// restore flags if this did not kill the monster.
			flags = f;
			flags2 = f2;
		}
		return health <= 0;
	}
	return false;
}

//----------------------------------------------------------------------------
//
// Serialize DActorModelData
//
//----------------------------------------------------------------------------

FSerializer &Serialize(FSerializer &arc, const char *key, ModelOverride &mo, ModelOverride *def)
{
	arc.BeginObject(key);
	arc("modelID", mo.modelID);
	arc("surfaceSkinIDs", mo.surfaceSkinIDs);
	arc.EndObject();
	return arc;
}

FSerializer &Serialize(FSerializer &arc, const char *key, struct AnimOverride &ao, struct AnimOverride *def)
{
	//TODO
	arc.BeginObject(key);
	arc("firstFrame", ao.firstFrame);
	arc("lastFrame", ao.lastFrame);
	arc("loopFrame", ao.loopFrame);
	arc("startFrame", ao.startFrame);
	arc("flags", ao.flags);
	arc("framerate", ao.framerate);
	arc("startTic", ao.startTic);
	arc("switchTic", ao.switchTic);
	arc.EndObject();
	return arc;
}

void DActorModelData::Serialize(FSerializer& arc)
{
	Super::Serialize(arc);
	arc("modelDef", modelDef)
		("models", models)
		("skinIDs", skinIDs)
		("animationIDs", animationIDs)
		("modelFrameGenerators", modelFrameGenerators)
		("flags", flags)
		("overrideFlagsSet", overrideFlagsSet)
		("overrideFlagsClear", overrideFlagsClear)
		("curAnim", curAnim)
		("prevAnim", prevAnim);
}

void DActorModelData::OnDestroy()
{
	models.Reset();
	modelFrameGenerators.Reset();
	skinIDs.Reset();
	//surfaceSkinIDs.Reset();
	animationIDs.Reset();
}

//----------------------------------------------------------------------------
//
// PROC P_ExplodeMissile
//
//----------------------------------------------------------------------------

void P_ExplodeMissile (AActor *mo, line_t *line, AActor *target, bool onsky, FName damageType)
{
	// [ZZ] line damage callback
	if (line)
	{
		P_ProjectileHitLinedef(mo, line);
	}

	if (mo->flags3 & MF3_EXPLOCOUNT)
	{
		if (++mo->threshold < mo->DefThreshold)
		{
			return;
		}
	}
	mo->Vel.Zero();
	mo->effects = 0;		// [RH]
	mo->flags &= ~MF_SHOOTABLE;
	
	FState *nextstate = nullptr;
	
	if (target != nullptr)
	{
		if (mo->flags7 & MF7_HITTARGET)	mo->target = target;
		if (mo->flags7 & MF7_HITMASTER)	mo->master = target;
		if (mo->flags7 & MF7_HITTRACER)	mo->tracer = target;
		if ((target->flags & (MF_SHOOTABLE | MF_CORPSE)) || (target->flags6 & MF6_KILLED))
		{
			if (target->flags & MF_NOBLOOD) nextstate = mo->FindState(NAME_Crash);
			if (nextstate == NULL) nextstate = mo->FindState(NAME_Death, NAME_Extreme);
		}
	}
	if (nextstate == NULL) nextstate = mo->FindState(NAME_Death, damageType);
	
	if (onsky || (line != NULL && line->special == Line_Horizon))
	{
		if (!(mo->flags3 & MF3_SKYEXPLODE))
		{
			// [RH] Don't explode missiles on horizon lines.
			mo->Destroy();
			return;
		}
		nextstate = mo->FindState(NAME_Death, NAME_Sky);
	}

	if (line != NULL && cl_missiledecals)
	{
		DVector3 pos = mo->PosRelative(line);
		int side = P_PointOnLineSidePrecise (pos, line);
		if (line->sidedef[side] == NULL)
			side ^= 1;
		if (line->sidedef[side] != NULL)
		{
			FDecalBase *base = mo->DecalGenerator;
			if (base != NULL)
			{
				// Find the nearest point on the line, and stick a decal there
				DVector3 linepos;
				double den, frac;

				den = line->Delta().LengthSquared();
				if (den != 0)
				{
					frac = clamp<double>((mo->Pos().XY() - line->v1->fPos()) | line->Delta(), 0, den) / den;

					linepos = DVector3(line->v1->fPos() + line->Delta() * frac, pos.Z);

					F3DFloor * ffloor=NULL;
					if (line->sidedef[side^1] != NULL)
					{
						sector_t * backsector = line->sidedef[side^1]->sector;
						extsector_t::xfloor &xf = backsector->e->XFloor;
						// find a 3D-floor to stick to
						for(unsigned int i=0;i<xf.ffloors.Size();i++)
						{
							F3DFloor * rover=xf.ffloors[i];

							if ((rover->flags&(FF_EXISTS|FF_SOLID|FF_RENDERSIDES))==(FF_EXISTS|FF_SOLID|FF_RENDERSIDES))
							{
								if (pos.Z <= rover->top.plane->ZatPoint(linepos) && pos.Z >= rover->bottom.plane->ZatPoint(linepos))
								{
									ffloor = rover;
									break;
								}
							}
						}
					}

					DImpactDecal::StaticCreate(mo->Level, base->GetDecal(), linepos, line->sidedef[side], ffloor);
				}
			}
		}
	}

	// play the sound before changing the state, so that AActor::OnDestroy can call S_RelinkSounds on it and the death state can override it.
	if (mo->DeathSound.isvalid())
	{
		S_Sound (mo, CHAN_VOICE, 0, mo->DeathSound, 1,
			(mo->flags3 & MF3_FULLVOLDEATH) ? ATTN_NONE : ATTN_NORM);
	}

	mo->SetState (nextstate);
	if (!(mo->ObjectFlags & OF_EuthanizeMe))
	{
		// The rest only applies if the missile actor still exists.
		// [RH] Change render style of exploding rockets
		if (mo->flags5 & MF5_DEHEXPLOSION)
		{
			if (deh.ExplosionStyle == 255)
			{
				if (addrocketexplosion)
				{
					mo->RenderStyle = STYLE_Add;
					mo->Alpha = 1.;
				}
				else
				{
					mo->RenderStyle = STYLE_Translucent;
					mo->Alpha = 0.6666;
				}
			}
			else
			{
				mo->RenderStyle = ERenderStyle(deh.ExplosionStyle);
				mo->Alpha = deh.ExplosionAlpha;
			}
		}

		if (mo->flags4 & MF4_RANDOMIZE)
		{
			mo->tics -= (pr_explodemissile() & 3) * TICRATE / 35;
			if (mo->tics < 1)
				mo->tics = 1;
		}

		mo->flags &= ~MF_MISSILE;

	}
}

DEFINE_ACTION_FUNCTION(AActor, ExplodeMissile)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_POINTER(line, line_t);
	PARAM_OBJECT(target, AActor);
	P_ExplodeMissile(self, line, target);
	return 0;
}


void AActor::PlayBounceSound(bool onfloor)
{
	if (!onfloor && (BounceFlags & BOUNCE_NoWallSound))
	{
		return;
	}

	if (!(BounceFlags & BOUNCE_Quiet))
	{
		if (BounceFlags & BOUNCE_UseSeeSound)
		{
			S_Sound (this, CHAN_VOICE, 0, SeeSound, 1, ATTN_IDLE);
		}
		else if (onfloor || !WallBounceSound.isvalid())
		{
			S_Sound (this, CHAN_VOICE, 0, BounceSound, 1, ATTN_IDLE);
		}
		else
		{
			S_Sound (this, CHAN_VOICE, 0, WallBounceSound, 1, ATTN_IDLE);
		}
	}
}

//----------------------------------------------------------------------------
//
// PROC P_FloorBounceMissile
//
// Returns true if the missile was destroyed
//----------------------------------------------------------------------------

bool AActor::FloorBounceMissile (secplane_t &plane)
{
	if (flags & MF_MISSILE)
	{
		switch (SpecialBounceHit(nullptr, nullptr, &plane))
		{
			// This one is backwards for some reason...
			case 1:		return false;
			case 0:		return true;
			default:	break;
		}
	}

	// [ZZ] if bouncing missile hits a damageable sector(plane), it dies
	if (P_ProjectileHitPlane(this, -1) && bouncecount > 0)
	{
		Vel.Zero();
		Speed = 0;
		bouncecount = 0;
		if (flags & MF_MISSILE)
			P_ExplodeMissile(this, nullptr, nullptr);
		else CallDie(nullptr, nullptr);
		return true;
	}

	if (Z() <= floorz && P_HitFloor (this))
	{
		// Landed in some sort of liquid
		if (BounceFlags & BOUNCE_ExplodeOnWater)
		{
			if (flags & MF_MISSILE)
				P_ExplodeMissile(this, NULL, NULL);
			else
				CallDie(NULL, NULL);
			return true;
		}
		if (!(BounceFlags & BOUNCE_CanBounceWater))
		{
			Destroy ();
			return true;
		}
	}

	bool onsky;

	if (plane.fC() < 0)
	{ // on ceiling
		if (!(BounceFlags & BOUNCE_Ceilings))
			return true;

		onsky = ceilingpic == skyflatnum;
	}
	else
	{ // on floor
		if (!(BounceFlags & BOUNCE_Floors))
			return true;

		onsky = floorpic == skyflatnum;
	}

	if (onsky && (BounceFlags & BOUNCE_NotOnSky))
	{
		Destroy();
		return true;
	}

	// The amount of bounces is limited
	if (bouncecount>0 && --bouncecount==0)
	{
		if (flags & MF_MISSILE)
			P_ExplodeMissile(this, NULL, NULL);
		else
			CallDie(NULL, NULL);
		return true;
	}

	double dot = (Vel | plane.Normal()) * 2;

	if (BounceFlags & (BOUNCE_HereticType | BOUNCE_MBF))
	{
		Vel -= plane.Normal() * dot;
		AngleFromVel();
		if (!(BounceFlags & BOUNCE_MBF)) // Heretic projectiles die, MBF projectiles don't.
		{
			flags |= MF_INBOUNCE;
			SetState (FindState(NAME_Death));
			flags &= ~MF_INBOUNCE;
			return false;
		}
		else Vel.Z *= GetMBFBounceFactor(this);
	}
	else // Don't run through this for MBF-style bounces
	{
		// The reflected velocity keeps only about 70% of its original speed
		Vel = (Vel - plane.Normal() * dot) * bouncefactor;
		AngleFromVel();
	}

	PlayBounceSound(true);

	// Set bounce state
	if (BounceFlags & BOUNCE_UseBounceState)
	{
		FName names[2] = { NAME_Bounce, plane.fC() < 0 ? NAME_Ceiling : NAME_Floor };
		FState *bouncestate = FindState(2, names);
		if (bouncestate != nullptr)
		{
			SetState(bouncestate);
		}
	}

	if (BounceFlags & BOUNCE_MBF) // Bring it to rest below a certain speed
	{
		if (fabs(Vel.Z) < Mass * GetGravity() / 64)
			Vel.Z = 0;
	}
	else if (BounceFlags & (BOUNCE_AutoOff|BOUNCE_AutoOffFloorOnly))
	{
		if (plane.fC() > 0 || (BounceFlags & BOUNCE_AutoOff))
		{
			// AutoOff only works when bouncing off a floor, not a ceiling (or in compatibility mode.)
			if (!(flags & MF_NOGRAVITY) && (Vel.Z < 3))
				BounceFlags &= ~BOUNCE_TypeMask;
		}
	}
	return false;
}

//----------------------------------------------------------------------------
//
// FUNC P_FaceMobj
//
// Returns 1 if 'source' needs to turn clockwise, or 0 if 'source' needs
// to turn counter clockwise.  'delta' is set to the amount 'source'
// needs to turn.
//
//----------------------------------------------------------------------------

static int P_FaceMobj (AActor *source, AActor *target, DAngle *delta)
{
	DAngle diff;

	diff = deltaangle(source->Angles.Yaw, source->AngleTo(target));
	if (diff > nullAngle)
	{
		*delta = diff;
		return 1;
	}
	else
	{
		*delta = -diff;
		return 0;
	}
}

//----------------------------------------------------------------------------
//
// CanSeek
//
// Checks if a seeker missile can home in on its target
//
//----------------------------------------------------------------------------

bool AActor::CanSeek(AActor *target) const
{
	if (target->flags5 & MF5_CANTSEEK) return false;
	if ((flags2 & MF2_DONTSEEKINVISIBLE) && 
		((target->flags & MF_SHADOW) || 
		 (target->renderflags & RF_INVISIBLE) || 
		 (target->flags8 & MF8_MINVISIBLE) ||
		 !target->RenderStyle.IsVisible(target->Alpha)
		)
	   ) return false;
	return true;
}

DEFINE_ACTION_FUNCTION(AActor, CanSeek)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT_NOT_NULL(target, AActor);
	ACTION_RETURN_BOOL(self->CanSeek(target));
}

//----------------------------------------------------------------------------
//
// FUNC P_SeekerMissile
//
// The missile's tracer field must be the target.  Returns true if
// target was tracked, false if not.
//
//----------------------------------------------------------------------------

bool P_SeekerMissile (AActor *actor, DAngle thresh, DAngle turnMax, bool precise, bool usecurspeed)
{
	int dir;
	DAngle delta;
	AActor *target;
	double speed;

	speed = !usecurspeed ? actor->Speed : actor->VelToSpeed();
	target = actor->tracer;
	if (target == NULL || !actor->CanSeek(target))
	{
		return false;
	}
	if (!(target->flags & MF_SHOOTABLE))
	{ // Target died
		actor->tracer = nullptr;
		return false;
	}
	if (speed == 0)
	{ // Technically, we're not seeking since our speed is 0, but the target *is* seekable.
		return true;
	}
	dir = P_FaceMobj (actor, target, &delta);
	if (delta > thresh)
	{
		delta /= 2;
		if (delta > turnMax)
		{
			delta = turnMax;
		}
	}
	if (dir)
	{ // Turn clockwise
		actor->Angles.Yaw += delta;
	}
	else
	{ // Turn counter clockwise
		actor->Angles.Yaw -= delta;
	}
	
	if (!precise)
	{
		actor->VelFromAngle(speed);

		if (!(actor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER)))
		{
			if (actor->Top() < target->Z() ||
				target->Top() < actor->Z())
			{ // Need to seek vertically
				actor->Vel.Z = (target->Center() - actor->Center()) / actor->DistanceBySpeed(target, speed);
			}
		}
	}
	else
	{
		DAngle pitch = nullAngle;
		if (!(actor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER)))
		{ // Need to seek vertically
			double dist = max(1., actor->Distance2D(target));
			// Aim at a player's eyes and at the middle of the actor for everything else.
			double aimheight = target->Height/2;
			if (target->player)
			{
				aimheight = target->player->DefaultViewHeight();
			}
			pitch = DVector2(dist, target->Z() + aimheight - actor->Center()).Angle();
		}
		actor->Vel3DFromAngle(-pitch, speed);
	}

	return true;
}


//
// P_XYMovement
//
// Returns the actor's old floorz.
//
#define STOPSPEED			(0x1000/65536.)
#define CARRYSTOPSPEED		((0x1000*32/3)/65536.)

static double P_XYMovement (AActor *mo, DVector2 scroll) 
{
	static int pushtime = 0;
	bool bForceSlide = !scroll.isZero();
	DVector2 ptry;
	player_t *player;
	DVector2 move;
	const secplane_t * walkplane;
	static const double windTab[3] = { 5 / 32., 10 / 32., 25 / 32. };
	int steps, step, totalsteps;
	DVector2 start;
	double Oldfloorz = mo->floorz;
	double oldz = mo->Z();

	double maxmove = (mo->waterlevel < 1) || (mo->flags & MF_MISSILE) || 
					  (mo->player && mo->player->crouchoffset<-10) ? MAXMOVE : MAXMOVE/4;

	if (mo->flags2 & MF2_WINDTHRUST && mo->waterlevel < 2 && !(mo->flags & MF_NOCLIP))
	{
		int special = mo->Sector->special;
		switch (special)
		{
			case 40: case 41: case 42: // Wind_East
				mo->Thrust(DAngle::fromDeg(0.), windTab[special-40]);
				break;
			case 43: case 44: case 45: // Wind_North
				mo->Thrust(DAngle::fromDeg(90.), windTab[special-43]);
				break;
			case 46: case 47: case 48: // Wind_South
				mo->Thrust(DAngle::fromDeg(270.), windTab[special-46]);
				break;
			case 49: case 50: case 51: // Wind_West
				mo->Thrust(DAngle::fromDeg(180.), windTab[special-49]);
				break;
		}
	}

	// [RH] No need to clamp these now. However, wall running needs it so
	// that large thrusts can't propel an actor through a wall, because wall
	// running depends on the player's original movement continuing even after
	// it gets blocked.
	//
	// [anon] When friction is turned off, turn off the crouching and water
	//  speed caps as well, since it is a sort of friction, and the modders
	//  most likely want to deal with that themselves.
	if ((mo->player != NULL && (mo->Level->i_compatflags & COMPATF_WALLRUN)) || ((mo->waterlevel >= 1 ||
		(mo->player != NULL && mo->player->crouchfactor < 0.75)) && !(mo->flags8 & MF8_NOFRICTION)))
	{
		// preserve the direction instead of clamping x and y independently.
		double cx = mo->Vel.X == 0 ? 1. : clamp(mo->Vel.X, -maxmove, maxmove) / mo->Vel.X;
		double cy = mo->Vel.Y == 0 ? 1. : clamp(mo->Vel.Y, -maxmove, maxmove) / mo->Vel.Y;
		double fac = min(cx, cy);

		mo->Vel.X *= fac;
		mo->Vel.Y *= fac;
	}
	const double VELOCITY_THRESHOLD = 5000;	// don't let it move faster than this. Fixed point overflowed at 32768 but that's too much to make this safe.
	if (mo->Vel.LengthSquared() >= VELOCITY_THRESHOLD*VELOCITY_THRESHOLD)
	{
		mo->Vel.MakeResize(VELOCITY_THRESHOLD);
	}
	move = mo->Vel.XY();
	// [RH] Carrying sectors didn't work with low speeds in BOOM. This is
	// because BOOM relied on the speed being fast enough to accumulate
	// despite friction. If the speed is too low, then its movement will get
	// cancelled, and it won't accumulate to the desired speed.
	mo->flags4 &= ~MF4_SCROLLMOVE;
	if (fabs(scroll.X) > CARRYSTOPSPEED)
	{
		scroll.X *= CARRYFACTOR;
		mo->Vel.X += scroll.X;
		mo->flags4 |= MF4_SCROLLMOVE;
	}
	if (fabs(scroll.Y) > CARRYSTOPSPEED)
	{
		scroll.Y *= CARRYFACTOR;
		mo->Vel.Y += scroll.Y;
		mo->flags4 |= MF4_SCROLLMOVE;
	}
	move += scroll;

	if (move.isZero())
	{
		if (mo->flags & MF_SKULLFLY)
		{
			// the skull slammed into something
			mo->flags &= ~MF_SKULLFLY;
			mo->Vel.Zero();
			if (!(mo->flags2 & MF2_DORMANT))
			{
				if (mo->SeeState != NULL) mo->SetState (mo->SeeState);
				else mo->SetIdle();
			}
			else
			{
				mo->SetIdle();
				mo->tics = -1;
			}
		}
		return Oldfloorz;
	}

	player = mo->player;

	// [RH] Adjust player movement on sloped floors
	DVector2 startmove = move;
	walkplane = P_CheckSlopeWalk (mo, move);

	// [RH] Take smaller steps when moving faster than the object's size permits.
	// Moving as fast as the object's "diameter" is bad because it could skip
	// some lines because the actor could land such that it is just touching the
	// line. For Doom to detect that the line is there, it needs to actually cut
	// through the actor.

	{
		double maxmove = mo->radius - 1;

		if (maxmove <= 0)
		{ // gibs can have radius 0, so don't divide by zero below!
			maxmove = MAXMOVE;
		}

		const double xspeed = fabs (move.X);
		const double yspeed = fabs (move.Y);

		steps = 1;

		if (xspeed > yspeed)
		{
			if (xspeed > maxmove)
			{
				steps = int(1 + xspeed / maxmove);
			}
		}
		else
		{
			if (yspeed > maxmove)
			{
				steps = int(1 + yspeed / maxmove);
			}
		}
	}

	// P_SlideMove needs to know the step size before P_CheckSlopeWalk
	// because it also calls P_CheckSlopeWalk on its clipped steps.
	DVector2 onestep = startmove / steps;

	start = mo->Pos().XY();
	step = 1;
	totalsteps = steps;

	// [RH] Instead of doing ripping damage each step, do it each tic.
	// This makes it compatible with Heretic and Hexen, which only did
	// one step for their missiles with ripping damage (excluding those
	// that don't use P_XYMovement). It's also more intuitive since it
	// makes the damage done dependant on the amount of time the projectile
	// spends inside a target rather than on the projectile's size. The
	// last actor ripped through is recorded so that if the projectile
	// passes through more than one actor this tic, each one takes damage
	// and not just the first one.
	pushtime++;

	FCheckPosition tm(!!(mo->flags2 & MF2_RIP));

	DAngle oldangle = mo->Angles.Yaw;
	do
	{
		if (mo->Level->i_compatflags & COMPATF_WALLRUN) pushtime++;
		tm.PushTime = pushtime;

		ptry = start + move * step / steps;

		DVector2 startvel = mo->Vel.XY();

		// killough 3/15/98: Allow objects to drop off
		// [RH] If walking on a slope, stay on the slope
		if (!P_TryMove (mo, ptry, true, walkplane, tm))
		{
			// blocked move
			AActor *BlockingMobj = mo->BlockingMobj;
			line_t *BlockingLine = mo->MovementBlockingLine = mo->BlockingLine;

			// [ZZ] 
			if (!BlockingLine && !BlockingMobj) // hit floor or ceiling while XY movement - sector actions
			{
				int hitpart = -1;
				sector_t* hitsector = nullptr;
				secplane_t* hitplane = nullptr;
				if (tm.ceilingsector && mo->Z() + mo->Height > tm.ceilingsector->ceilingplane.ZatPoint(tm.pos.XY()))
					mo->BlockingCeiling = tm.ceilingsector;
				if (tm.floorsector && mo->Z() < tm.floorsector->floorplane.ZatPoint(tm.pos.XY()))
					mo->BlockingFloor = tm.floorsector;
				// the following two only set the appropriate field - to avoid issues caused by running actions right in the middle of XY movement
				P_CheckFor3DFloorHit(mo, mo->floorz, false);
				P_CheckFor3DCeilingHit(mo, mo->ceilingz, false);
			}

			if (!(mo->flags & MF_MISSILE) && (mo->BounceFlags & BOUNCE_MBF) 
				&& (BlockingMobj != NULL ? P_BounceActor(mo, BlockingMobj, false) : P_BounceWall(mo)))
			{
				// Do nothing, relevant actions already done in the condition.
				// This allows to avoid setting velocities to 0 in the final else of this series.
			}
			else if ((mo->flags2 & (MF2_SLIDE|MF2_BLASTED) || bForceSlide) && !(mo->flags&MF_MISSILE))
			{	// try to slide along it
				if (BlockingMobj == NULL)
				{ // slide against wall
					if (BlockingLine != NULL &&
						mo->player && mo->waterlevel && mo->waterlevel < 3 &&
						(mo->player->cmd.ucmd.forwardmove | mo->player->cmd.ucmd.sidemove) &&
						mo->BlockingLine->sidedef[1] != NULL)
					{
						double spd = mo->FloatVar(NAME_WaterClimbSpeed);
						if (fabs(spd) >= EQUAL_EPSILON)
							mo->Vel.Z = spd;
					}
					// If the blocked move executed any push specials that changed the
					// actor's velocity, do not attempt to slide.
					if (mo->Vel.XY() == startvel)
					{
						if (player && (mo->Level->i_compatflags & COMPATF_WALLRUN))
						{
						// [RH] Here is the key to wall running: The move is clipped using its full speed.
						// If the move is done a second time (because it was too fast for one move), it
						// is still clipped against the wall at its full speed, so you effectively
						// execute two moves in one tic.
							P_SlideMove (mo, mo->Vel.XY(), 1);
						}
						else
						{
							P_SlideMove (mo, onestep, totalsteps);
						}
						if (mo->Vel.XY().isZero())
						{
							steps = 0;
						}
						else
						{
							if (!player || !(mo->Level->i_compatflags & COMPATF_WALLRUN))
							{
								move = mo->Vel.XY();
								onestep = move / steps;
								P_CheckSlopeWalk (mo, move);
							}
							start = mo->Pos().XY() - move * step / steps;
						}
					}
					else
					{
						steps = 0;
					}
				}
				else
				{ // slide against another actor
					DVector2 t;
					t.X = 0, t.Y = onestep.Y;
					walkplane = P_CheckSlopeWalk (mo, t);
					if (P_TryMove (mo, mo->Pos().XY() + t, true, walkplane, tm))
					{
						mo->Vel.X = 0;
					}
					else
					{
						t.X = onestep.X, t.Y = 0;
						walkplane = P_CheckSlopeWalk (mo, t);
						if (P_TryMove (mo, mo->Pos().XY() + t, true, walkplane, tm))
						{
							mo->Vel.Y = 0;
						}
						else
						{
							mo->Vel.X = mo->Vel.Y = 0;
						}
					}
					if (player && player->mo == mo)
					{
						if (mo->Vel.X == 0)
							player->Vel.X = 0;
						if (mo->Vel.Y == 0)
							player->Vel.Y = 0;
					}
					steps = 0;
				}
			}
			else if (mo->flags & MF_MISSILE)
			{
				steps = 0;
				if (BlockingMobj)
				{
					if (mo->BounceFlags & BOUNCE_Actors)
					{
						// Bounce test and code moved to P_BounceActor
						if (!P_BounceActor(mo, BlockingMobj, false))
						{	// Struck a player/creature
							P_ExplodeMissile (mo, NULL, BlockingMobj);
						}
						return Oldfloorz;
					}
				}
				else
				{
					// Struck a wall
					if (P_BounceWall (mo))
					{
						mo->PlayBounceSound(false);
						return Oldfloorz;
					}
				}
				if (BlockingMobj && P_ReflectOffActor(mo, BlockingMobj))
				{
					return Oldfloorz;
				}

				// explode a missile
				bool onsky = false;
				if (tm.ceilingline && tm.ceilingline->hitSkyWall(mo))
				{
					if (!(mo->flags3 & MF3_SKYEXPLODE))
					{
						// Hack to prevent missiles exploding against the sky.
						// Does not handle sky floors.
						mo->Destroy();
						return Oldfloorz;
					}
					else onsky = true;
				}
				// [RH] Don't explode on horizon lines.
				if (mo->BlockingLine != NULL && mo->BlockingLine->special == Line_Horizon)
				{
					if (!(mo->flags3 & MF3_SKYEXPLODE))
					{
						mo->Destroy();
						return Oldfloorz;
					}
					else onsky = true;
				}
				if (mo->BlockingCeiling) // hit floor or ceiling while XY movement
				{
					P_ProjectileHitPlane(mo, SECPART_Ceiling);
				}
				if (mo->BlockingFloor)
				{
					P_ProjectileHitPlane(mo, SECPART_Floor);
				}
				P_ExplodeMissile (mo, mo->BlockingLine, BlockingMobj, onsky);
				return Oldfloorz;
			}
			else
			{
				mo->Vel.X = mo->Vel.Y = 0;
				steps = 0;
			}
		}
		else
		{
			if (mo->Pos().XY() != ptry)
			{
				// If the new position does not match the desired position, the player
				// must have gone through a teleporter or portal.
				
				if (mo->Vel.X == 0 && mo->Vel.Y == 0)
				{
					// Stop moving right now if it was a regular teleporter.
					step = steps;
				}
				else
				{
					// It was a portal, line-to-line or fogless teleporter, so the move should continue.
					// For that we need to adjust the start point, and the movement vector.
					DAngle anglediff = deltaangle(oldangle, mo->Angles.Yaw);

					if (anglediff != nullAngle)
					{
						move = move.Rotated(anglediff);
						oldangle = mo->Angles.Yaw;
					}
					start = mo->Pos().XY() - move * step / steps;
				}
			}
		}
	} while (++step <= steps);

	// Friction

	if (player && player->mo == mo && player->cheats & CF_NOVELOCITY)
	{ // debug option for no sliding at all
		mo->Vel.X = mo->Vel.Y = 0;
		player->Vel.X = player->Vel.Y = 0;
		return Oldfloorz;
	}

	if (mo->flags & (MF_MISSILE | MF_SKULLFLY) || mo->flags8 & MF8_NOFRICTION)
	{ // no friction for missiles
		return Oldfloorz;
	}

	if (mo->Z() > mo->floorz && !(mo->flags2 & MF2_ONMOBJ) &&
		!mo->IsNoClip2() &&
		(!(mo->flags2 & MF2_FLY) || !(mo->flags & MF_NOGRAVITY)) &&
		!mo->waterlevel)
	{ // [RH] Friction when falling is available for larger aircontrols
		auto airfriction = mo->Level->airfriction;
		if (player != NULL && airfriction != 1.)
		{
			mo->Vel.X *= airfriction;
			mo->Vel.Y *= airfriction;

			if (player->mo == mo)		//  Not voodoo dolls
			{
				player->Vel.X *= airfriction;
				player->Vel.Y *= airfriction;
			}
		}
		return Oldfloorz;
	}

	// killough 8/11/98: add bouncers
	// killough 9/15/98: add objects falling off ledges
	// killough 11/98: only include bouncers hanging off ledges
	if ((mo->flags & MF_CORPSE) || (mo->BounceFlags & BOUNCE_MBF && mo->Z() > mo->dropoffz) || (mo->flags6 & MF6_FALLING))
	{ // Don't stop sliding if halfway off a step with some velocity
		if (fabs(mo->Vel.X) > 0.25 || fabs(mo->Vel.Y) > 0.25)
		{
			if (mo->floorz > mo->Sector->floorplane.ZatPoint(mo))
			{
				if (mo->dropoffz != mo->floorz) // 3DMidtex or other special cases that must be excluded
				{
					unsigned i;
					for(i=0;i<mo->Sector->e->XFloor.ffloors.Size();i++)
					{
						// Sliding around on 3D floors looks extremely bad so
						// if the floor comes from one in the current sector stop sliding the corpse!
						F3DFloor * rover=mo->Sector->e->XFloor.ffloors[i];
						if (!(rover->flags&FF_EXISTS)) continue;
						if (rover->flags&FF_SOLID && rover->top.plane->ZatPoint(mo) == mo->floorz) break;
					}
					if (i==mo->Sector->e->XFloor.ffloors.Size()) 
						return Oldfloorz;
				}
			}
		}
	}

	// killough 11/98:
	// Stop voodoo dolls that have come to rest, despite any
	// moving corresponding player:
	if (fabs(mo->Vel.X) < STOPSPEED && fabs(mo->Vel.Y) < STOPSPEED
		&& (!player || (player->mo != mo)
			|| !(player->cmd.ucmd.forwardmove | player->cmd.ucmd.sidemove)))
	{
		// if in a walking frame, stop moving
		// killough 10/98:
		// Don't affect main player when voodoo dolls stop:
		if (player && player->mo == mo && !(player->cheats & CF_PREDICTING))
		{
			PlayIdle (player->mo);
		}

		mo->Vel.X = mo->Vel.Y = 0;
		mo->flags4 &= ~MF4_SCROLLMOVE;

		// killough 10/98: kill any bobbing velocity too (except in voodoo dolls)
		if (player && player->mo == mo)
			player->Vel.X = player->Vel.Y = 0;
	}
	else
	{
		// phares 3/17/98
		// Friction will have been adjusted by friction thinkers for icy
		// or muddy floors. Otherwise it was never touched and
		// remained set at ORIG_FRICTION
		//
		// killough 8/28/98: removed inefficient thinker algorithm,
		// instead using touching_sectorlist in P_GetFriction() to
		// determine friction (and thus only when it is needed).
		//
		// killough 10/98: changed to work with new bobbing method.
		// Reducing player velocity is no longer needed to reduce
		// bobbing, so ice works much better now.

		double friction = P_GetFriction (mo, NULL);

		mo->Vel.X *= friction;
		mo->Vel.Y *= friction;

		// killough 10/98: Always decrease player bobbing by ORIG_FRICTION.
		// This prevents problems with bobbing on ice, where it was not being
		// reduced fast enough, leading to all sorts of kludges being developed.

		if (player && player->mo == mo)		//  Not voodoo dolls
		{
			player->Vel.X *= ORIG_FRICTION;
			player->Vel.Y *= ORIG_FRICTION;
		}

		// Don't let the velocity become less than the smallest representable fixed point value.
		if (fabs(mo->Vel.X) < MinVel) mo->Vel.X = 0;
		if (fabs(mo->Vel.Y) < MinVel) mo->Vel.Y = 0;
		if (player && player->mo == mo)		//  Not voodoo dolls
		{
			if (fabs(player->Vel.X) < MinVel) player->Vel.X = 0;
			if (fabs(player->Vel.Y) < MinVel) player->Vel.Y = 0;
		}
	}
	return Oldfloorz;
}


static void P_MonsterFallingDamage (AActor *mo)
{
	int damage;
	double vel;

	if (!(mo->Level->flags2 & LEVEL2_MONSTERFALLINGDAMAGE) && !(mo->flags8 & MF8_FALLDAMAGE))
		return;
	if (mo->floorsector->Flags & SECF_NOFALLINGDAMAGE)
		return;

	vel = fabs(mo->Vel.Z);
	if (vel > 35)
	{ // automatic death
		damage = TELEFRAG_DAMAGE;
	}
	else
	{
		damage = int((vel - 23)*6);
	}
	if (!(mo->Level->flags3 & LEVEL3_PROPERMONSTERFALLINGDAMAGE)) damage = TELEFRAG_DAMAGE;
	P_DamageMobj (mo, NULL, NULL, damage, NAME_Falling);
}

//
// P_ZMovement
//

static void P_ZMovement (AActor *mo, double oldfloorz)
{
	double dist;
	double delta;
	double oldz = mo->Z();
	double grav = mo->GetGravity();

//
// check for smooth step up
//
	if (mo->player && mo->player->mo == mo && mo->Z() < mo->floorz)
	{
		mo->player->viewheight -= mo->floorz - mo->Z();
		mo->player->deltaviewheight = mo->player->GetDeltaViewHeight();
	}

	mo->AddZ(mo->Vel.Z);

	mo->CallFallAndSink(grav, oldfloorz);

	// Hexen compatibility handling for floatbobbing. Ugh...
	// Hexen yanked all items to the floor, except those being spawned at map start in the air.
	// Those were kept at their original height.
	// Do this only if the item was actually spawned by the map above ground to avoid problems.
	if (mo->specialf1 > 0 && (mo->flags2 & MF2_FLOATBOB) && (mo->Level->ib_compatflags & BCOMPATF_FLOATBOB))
	{
		mo->SetZ(mo->floorz + mo->specialf1);
	}


//
// adjust height
//
	if ((mo->flags & MF_FLOAT) && !(mo->flags2 & MF2_DORMANT) && mo->target)
	{	// float down towards target if too close
		if (!(mo->flags & (MF_SKULLFLY | MF_INFLOAT)))
		{
			dist = mo->Distance2D (mo->target);
			delta = (mo->target->Center()) - mo->Z();
			if (delta < 0 && dist < -(delta*3))
				mo->AddZ(-mo->FloatSpeed);
			else if (delta > 0 && dist < (delta*3))
				mo->AddZ(mo->FloatSpeed);
		}
	}
	if (mo->player && (mo->flags & MF_NOGRAVITY) && (mo->Z() > mo->floorz))
	{
		FBaseCVar* const fViewBobCvar = G_GetUserCVar(int(mo->player - players),"FViewBob");
		bool const fViewBob = fViewBobCvar->GetGenericRep(fViewBobCvar->GetRealType()).Bool;

		if (!mo->IsNoClip2() && fViewBob)
		{
			mo->AddZ(DAngle::fromDeg(360 / 80.f * mo->Level->maptime).Sin() / 8 * mo->FloatVar(NAME_FlyBob));
		}

		if (!(mo->flags8 & MF8_NOFRICTION))
		{
			mo->Vel.Z *= FRICTION_FLY;
		}
	}
	if (mo->waterlevel && !(mo->flags & MF_NOGRAVITY) && !(mo->flags8 & MF8_NOFRICTION))
	{
		double friction = -1;

		// Check 3D floors -- might be the source of the waterlevel
		for (auto rover : mo->Sector->e->XFloor.ffloors)
		{
			if (!(rover->flags & FF_EXISTS)) continue;
			if (!(rover->flags & FF_SWIMMABLE)) continue;

			if (mo->Z() >= rover->top.plane->ZatPoint(mo) ||
				mo->Center() < rover->bottom.plane->ZatPoint(mo))
				continue;

			friction = rover->model->GetFriction(rover->top.isceiling);
			break;
		}
		if (friction < 0)
			friction = mo->Sector->GetFriction();	// get real friction, even if from a terrain definition

		mo->Vel.Z *= friction;
	}

//
// clip movement
//
	if (mo->Z() <= mo->floorz)
	{	// Hit the floor
		if ((!mo->player || !(mo->player->cheats & CF_PREDICTING)) &&
			mo->Sector->SecActTarget != NULL &&
			mo->Sector->floorplane.ZatPoint(mo) == mo->floorz)
		{ // [RH] Let the sector do something to the actor
			mo->Sector->TriggerSectorActions(mo, SECSPAC_HitFloor);
		}
		P_CheckFor3DFloorHit(mo, mo->floorz, true);
		// [RH] Need to recheck this because the sector action might have
		// teleported the actor so it is no longer below the floor.
		if (mo->Z() <= mo->floorz)
		{
			mo->BlockingFloor = mo->Sector;
			if ((mo->flags & MF_MISSILE) && !(mo->flags & MF_NOCLIP))
			{
				mo->SetZ(mo->floorz);
				if (mo->BounceFlags & BOUNCE_Floors)
				{
					mo->FloorBounceMissile (mo->floorsector->floorplane);
					/* if (!CanJump(mo)) */ return;
				}
				else if (mo->flags3 & MF3_NOEXPLODEFLOOR)
				{
					P_HitFloor (mo);
					mo->Vel.Z = 0;
					return;
				}
				else if ((mo->flags3 & MF3_FLOORHUGGER) && !(mo->flags5 & MF5_NODROPOFF))
				{ // Floor huggers can go up steps
					return;
				}
				else
				{
					bool onsky = false;
					if (mo->floorpic == skyflatnum)
					{
						if (!(mo->flags3 & MF3_SKYEXPLODE))
						{
							// [RH] Just remove the missile without exploding it
							//		if this is a sky floor.
							mo->Destroy();
							return;
						}
						else onsky = true;
					}
					P_HitFloor (mo);
					// hit floor: direct damage callback
					P_ProjectileHitPlane(mo, SECPART_Floor);
					P_ExplodeMissile (mo, NULL, NULL, onsky);
					return;
				}
			}
			else if (mo->BounceFlags & BOUNCE_MBF && mo->Vel.Z) // check for MBF-like bounce on non-missiles
			{
				mo->FloorBounceMissile(mo->floorsector->floorplane);
			}
			if (mo->flags3 & MF3_ISMONSTER)		// Blasted mobj falling
			{
				if (mo->Vel.Z < -23)
				{
					P_MonsterFallingDamage (mo);
				}
			}
			mo->SetZ(mo->floorz);
			if (mo->Vel.Z < 0)
			{
				const double minvel = -8;	// landing speed from a jump with normal gravity

				// Spawn splashes, etc.
				P_HitFloor (mo);
				if (mo->DamageType == NAME_Ice && mo->Vel.Z < minvel)
				{
					mo->tics = 1;
					mo->Vel.Zero();
					return;
				}
				// Let the actor do something special for hitting the floor
				if (mo->flags7 & MF7_SMASHABLE)
				{
					P_DamageMobj(mo, nullptr, nullptr, mo->health, NAME_Smash);
				}
				if (mo->player)
				{
					if (mo->player->jumpTics < 0 || mo->Vel.Z < minvel)
					{ // delay any jumping for a short while
						mo->player->jumpTics = 7;
					}
					if (mo->Vel.Z < minvel && !(mo->flags & MF_NOGRAVITY))
					{
						// Squat down.
						// Decrease viewheight for a moment after hitting the ground (hard),
						// and utter appropriate sound.
						PlayerLandedOnThing (mo, NULL);
					}
				}
				mo->Vel.Z = 0;
			}
			if (mo->flags & MF_SKULLFLY)
			{ // The skull slammed into something
				mo->Vel.Z = -mo->Vel.Z;
			}
			mo->Crash();
		}
	}

	if (mo->flags2 & MF2_FLOORCLIP)
	{
		mo->AdjustFloorClip ();
	}

	if (mo->Top() > mo->ceilingz)
	{ // hit the ceiling
		if ((!mo->player || !(mo->player->cheats & CF_PREDICTING)) &&
			mo->Sector->SecActTarget != NULL &&
			mo->Sector->ceilingplane.ZatPoint(mo) == mo->ceilingz)
		{ // [RH] Let the sector do something to the actor
			mo->Sector->TriggerSectorActions (mo, SECSPAC_HitCeiling);
		}
		P_CheckFor3DCeilingHit(mo, mo->ceilingz, true);
		// [RH] Need to recheck this because the sector action might have
		// teleported the actor so it is no longer above the ceiling.
		if (mo->Top() > mo->ceilingz)
		{
			mo->BlockingCeiling = mo->Sector;
			mo->SetZ(mo->ceilingz - mo->Height);
			if (mo->BounceFlags & BOUNCE_Ceilings)
			{	// ceiling bounce
				mo->FloorBounceMissile (mo->ceilingsector->ceilingplane);
				/* if (!CanJump(mo)) */ return;
			}
			if (mo->flags & MF_SKULLFLY)
			{	// the skull slammed into something
				mo->Vel.Z = -mo->Vel.Z;
			}
			if (mo->Vel.Z > 0)
				mo->Vel.Z = 0;
			if ((mo->flags & MF_MISSILE) && !(mo->flags & MF_NOCLIP))
			{
				if (mo->flags3 & MF3_CEILINGHUGGER)
				{
					return;
				}
				bool onsky = false;
				if (mo->ceilingpic == skyflatnum)
				{
					if (!(mo->flags3 & MF3_SKYEXPLODE))
					{
						mo->Destroy();
						return;
					}
					else onsky = true;
				}
				// hit ceiling: direct damage callback
				P_ProjectileHitPlane(mo, SECPART_Ceiling);
				P_ExplodeMissile (mo, NULL, NULL, onsky);
				return;
			}
		}
	}
	P_CheckFakeFloorTriggers (mo, oldz);
}

void P_CheckFakeFloorTriggers (AActor *mo, double oldz, bool oldz_has_viewheight)
{
	if (mo->player && (mo->player->cheats & CF_PREDICTING))
	{
		return;
	}
	sector_t *sec = mo->Sector;
	assert (sec != NULL);
	if (sec == NULL)
	{
		return;
	}
	if (sec->heightsec != NULL && sec->SecActTarget != NULL)
	{
		sector_t *hs = sec->heightsec;
		double waterz = hs->floorplane.ZatPoint(mo);
		double newz;
		double viewheight;

		if (mo->player != NULL)
		{
			viewheight = mo->player->viewheight;
		}
		else
		{
			viewheight = mo->Height;
		}

		if (oldz > waterz && mo->Z() <= waterz)
		{ // Feet hit fake floor
			sec->TriggerSectorActions (mo, SECSPAC_HitFakeFloor);
		}

		newz = mo->Z() + viewheight;
		if (!oldz_has_viewheight)
		{
			oldz += viewheight;
		}

		if (oldz <= waterz && newz > waterz)
		{ // View went above fake floor
			sec->TriggerSectorActions (mo, SECSPAC_EyesSurface);
		}
		else if (oldz > waterz && newz <= waterz)
		{ // View went below fake floor
			sec->TriggerSectorActions (mo, SECSPAC_EyesDive);
		}

		if (!(hs->MoreFlags & SECMF_FAKEFLOORONLY))
		{
			waterz = hs->ceilingplane.ZatPoint(mo);
			if (oldz <= waterz && newz > waterz)
			{ // View went above fake ceiling
				sec->TriggerSectorActions (mo, SECSPAC_EyesAboveC);
			}
			else if (oldz > waterz && newz <= waterz)
			{ // View went below fake ceiling
				sec->TriggerSectorActions (mo, SECSPAC_EyesBelowC);
			}
		}
	}
}

DEFINE_ACTION_FUNCTION(AActor, CheckFakeFloorTriggers)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(oldz);
	PARAM_BOOL(oldz_has_viewh);
	P_CheckFakeFloorTriggers(self, oldz, oldz_has_viewh);
	return 0;
}
//===========================================================================
//
// PlayerLandedOnThing
//
//===========================================================================

static void PlayerLandedMakeGruntSound(AActor* self, AActor *onmobj)
{
	IFVIRTUALPTR(self, AActor, PlayerLandedMakeGruntSound)
	{
		VMValue params[2] = { self, onmobj };
		VMCall(func, params, 2, nullptr, 0);
	}
}

static void PlayerLandedOnThing (AActor *mo, AActor *onmobj)
{
	if (!mo->player)
		return;

	if (mo->player->mo == mo)
	{
		mo->player->deltaviewheight = mo->Vel.Z / 8.;
	}

	if (mo->player->cheats & CF_PREDICTING)
		return;

	P_FallingDamage (mo);

	PlayerLandedMakeGruntSound(mo, onmobj);

//	mo->player->centering = true;
}

//==========================================================================
//
// AActor :: FallAndSink
//
//==========================================================================

void AActor::FallAndSink(double grav, double oldfloorz)
{
	if (Z() > floorz && !(flags & MF_NOGRAVITY))
	{
		double startvelz = Vel.Z;

		if (waterlevel == 0 || (player &&
			!(player->cmd.ucmd.forwardmove | player->cmd.ucmd.sidemove)))
		{
			// [RH] Double gravity only if running off a ledge. Coming down from
			// an upward thrust (e.g. a jump) should not double it.
			if (Vel.Z == 0 && oldfloorz > floorz && Z() == oldfloorz)
			{
				Vel.Z -= grav + grav;
			}
			else
			{
				Vel.Z -= grav;
			}
		}
		if (player == NULL)
		{
			if (waterlevel >= 1)
			{
				double sinkspeed;

				if ((flags & MF_SPECIAL) && !(flags3 & MF3_ISMONSTER))
				{ // Pickup items don't sink if placed and drop slowly if dropped
					sinkspeed = (flags & MF_DROPPED) ? -WATER_SINK_SPEED / 8 : 0;
				}
				else
				{
					sinkspeed = -WATER_SINK_SPEED;

					// If it's not a player, scale sinkspeed by its mass, with
					// 100 being equivalent to a player.
					if (player == NULL)
					{
						sinkspeed = sinkspeed * clamp(Mass, 1, 4000) / 100;
					}
				}
				if (Vel.Z < sinkspeed)
				{ // Dropping too fast, so slow down toward sinkspeed.
					Vel.Z -= max(sinkspeed * 2, -8.);
					if (Vel.Z > sinkspeed)
					{
						Vel.Z = sinkspeed;
					}
				}
				else if (Vel.Z > sinkspeed)
				{ // Dropping too slow/going up, so trend toward sinkspeed.
					Vel.Z = startvelz + max(sinkspeed / 3, -8.);
					if (Vel.Z < sinkspeed)
					{
						Vel.Z = sinkspeed;
					}
				}
			}
		}
		else
		{
			if (waterlevel > 1)
			{
				double sinkspeed = -WATER_SINK_SPEED;

				if (Vel.Z < sinkspeed)
				{
					Vel.Z = (startvelz < sinkspeed) ? startvelz : sinkspeed;
				}
				else
				{
					Vel.Z = startvelz + ((Vel.Z - startvelz) *
						(waterlevel == 1 ? WATER_SINK_SMALL_FACTOR : WATER_SINK_FACTOR));
				}
			}
		}
	}
}

DEFINE_ACTION_FUNCTION(AActor, FallAndSink)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(grav);
	PARAM_FLOAT(oldfloorz);
	self->FallAndSink(grav, oldfloorz);
	return 0;
}

void AActor::CallFallAndSink(double grav, double oldfloorz)
{
	IFVIRTUAL(AActor, FallAndSink)
	{
		VMValue params[3] = { (DObject*)this, grav, oldfloorz };
		VMCall(func, params, 3, nullptr, 0);
	}
	else
	{
	FallAndSink(grav, oldfloorz);
	}
}

//
// P_NightmareRespawn
//
void P_NightmareRespawn (AActor *mobj)
{
	double z;
	AActor *mo;
	AActor *info = mobj->GetDefault();

	mobj->skillrespawncount++;

	// spawn the new monster (assume the spawn will be good)
	if (info->flags & MF_SPAWNCEILING)
		z = ONCEILINGZ;
	else if (info->flags2 & MF2_SPAWNFLOAT)
		z = FLOATRANDZ;
	else
		z = ONFLOORZ;

	// spawn it
	mo = AActor::StaticSpawn(mobj->Level, mobj->GetClass(), DVector3(mobj->SpawnPoint.X, mobj->SpawnPoint.Y, z), NO_REPLACE, true);
	mo->health = mobj->SpawnHealth();

	if (z == ONFLOORZ)
	{
		mo->AddZ(mobj->SpawnPoint.Z);
		if (mo->Z() < mo->floorz)
		{ // Do not respawn monsters in the floor, even if that's where they
		  // started. The initial P_ZMovement() call would have put them on
		  // the floor right away, but we need them on the floor now so we
		  // can use P_CheckPosition() properly.
			mo->SetZ(mo->floorz);
		}
		if (mo->Top() > mo->ceilingz)
		{
			mo->SetZ(mo->ceilingz- mo->Height);
		}
	}
	else if (z == ONCEILINGZ)
	{
		mo->AddZ(-mobj->SpawnPoint.Z);
	}

	// If there are 3D floors, we need to find floor/ceiling again.
	P_FindFloorCeiling(mo, FFCF_SAMESECTOR | FFCF_ONLY3DFLOORS | FFCF_3DRESTRICT);

	if (z == ONFLOORZ)
	{
		if (mo->Z() < mo->floorz)
		{ // Do not respawn monsters in the floor, even if that's where they
		  // started. The initial P_ZMovement() call would have put them on
		  // the floor right away, but we need them on the floor now so we
		  // can use P_CheckPosition() properly.
			mo->SetZ(mo->floorz);
		}
		if (mo->Top() > mo->ceilingz)
		{ // Do the same for the ceiling.
			mo->SetZ(mo->ceilingz - mo->Height);
		}
	}

	// something is occupying its position?
	if (!P_CheckPosition(mo, mo->Pos().XY(), true))
	{
		//[GrafZahl] MF_COUNTKILL still needs to be checked here.
		mo->ClearCounters();
		mo->Destroy ();
		return;		// no respawn
	}

	z = mo->Z();

	// inherit attributes from deceased one
	mo->SpawnPoint = mobj->SpawnPoint;
	mo->SpawnAngle = mobj->SpawnAngle;
	mo->SpawnFlags = mobj->SpawnFlags & ~MTF_DORMANT;	// It wasn't dormant when it died, so it's not dormant now, either.
	mo->Angles.Yaw = DAngle::fromDeg(mobj->SpawnAngle);

	mo->HandleSpawnFlags ();
	mo->reactiontime = 18;
	mo->CopyFriendliness (mobj, false);
	mo->Translation = mobj->Translation;

	mo->skillrespawncount = mobj->skillrespawncount;

	mo->Prev.Z = z;		// Do not interpolate Z position if we changed it since spawning.

	// spawn a teleport fog at old spot because of removal of the body?
	P_SpawnTeleportFog(mobj, mobj->Pos(), true, true);

	// spawn a teleport fog at the new spot
	P_SpawnTeleportFog(mobj, DVector3(mobj->SpawnPoint.XY(), z), false, true);

	// remove the old monster
	mobj->Destroy ();
}


//
// P_AddMobjToHash
//
// Inserts an mobj into the correct chain based on its tid.
// If its tid is 0, this function does nothing.
//
void AActor::AddToHash ()
{
	assert(!(ObjectFlags & OF_EuthanizeMe));

	if (tid == 0)
	{
		iprev = NULL;
		inext = NULL;
		return;
	}
	else
	{
		int hash = TIDHASH (tid);
		auto &slot = Level->TIDHash[hash];

		inext = slot;
		iprev = &slot;
		slot = this;
		if (inext)
		{
			inext->iprev = &inext;
		}
	}
}

//
// P_RemoveMobjFromHash
//
// Removes an mobj from its hash chain.
//
void AActor::RemoveFromHash ()
{
	if (tid != 0 && iprev)
	{
		*iprev = inext;
		if (inext)
		{
			inext->iprev = iprev;
		}
		iprev = NULL;
		inext = NULL;
	}
	tid = 0;
}

void AActor::SetTID (int newTID)
{
	RemoveFromHash();

	if (ObjectFlags & OF_EuthanizeMe)
	{
		// Do not assign TID and do not link actor into the hash
		// if it was already destroyed and will be freed by GC
		return;
	}

	tid = newTID;

	AddToHash();
}


//==========================================================================
//
// P_IsTIDUsed
//
// Returns true if there is at least one actor with the specified TID
// (dead or alive).
//
//==========================================================================

bool FLevelLocals::IsTIDUsed(int tid)
{
	AActor *probe = TIDHash[tid & 127];
	while (probe != NULL)
	{
		if (probe->tid == tid)
		{
			return true;
		}
		probe = probe->inext;
	}
	return false;
}

//==========================================================================
//
// P_FindUniqueTID
//
// Returns an unused TID. If start_tid is 0, then a random TID will be
// chosen. Otherwise, it will perform a linear search starting from
// start_tid. If limit is non-0, then it will not check more than <limit>
// number of TIDs. Returns 0 if no suitable TID was found.
//
//==========================================================================

int FLevelLocals::FindUniqueTID(int start_tid, int limit)
{
	int tid;

	if (start_tid != 0)
	{ // Do a linear search.
		if (start_tid > INT_MAX-limit+1)
		{ // If 'limit+start_tid-1' overflows, clamp 'limit' to INT_MAX
			limit = INT_MAX;
		}
		else
		{
			limit += start_tid-1;
		}
		for (tid = start_tid; tid <= limit; ++tid)
		{
			if (tid != 0 && !IsTIDUsed(tid))
			{
				return tid;
			}
		}
		// Nothing free found.
		return 0;
	}
	// Do a random search. To try and be a bit more performant, this
	// actually does several linear searches. In the case of *very*
	// dense TID usage, this could potentially perform worse than doing
	// a complete linear scan starting at 1. However, you would need
	// to use an absolutely ridiculous number of actors before this
	// becomes a real concern.
	if (limit == 0)
	{
		limit = INT_MAX;
	}
	for (int i = 0; i < limit; i += 5)
	{
		// Use a positive starting TID.
		tid = pr_uniquetid.GenRand32() & INT_MAX;
		tid = FindUniqueTID(tid == 0 ? 1 : tid, 5);
		if (tid != 0)
		{
			return tid;
		}
	}
	// Nothing free found.
	return 0;
}


CCMD(utid)
{
	for (auto Level : AllLevels())
	{
		Printf("%s, %d\n", Level->MapName.GetChars(), Level->FindUniqueTID(argv.argc() > 1 ? atoi(argv[1]) : 0,
			(argv.argc() > 2 && atoi(argv[2]) >= 0) ? atoi(argv[2]) : 0));
	}
}

//==========================================================================
//
// AActor :: GetMissileDamage
//
// If the actor's damage amount is an expression, evaluate it and return
// the result. Otherwise, return ((random() & mask) + add) * damage.
//
//==========================================================================

int AActor::GetMissileDamage (int mask, int add)
{
	if (DamageVal >= 0)
	{
		if (mask == 0)
		{
			return add * DamageVal;
		}
		else
		{
			return ((pr_missiledamage() & mask) + add) * DamageVal;
		}
	}
	if (DamageFunc == nullptr)
	{
		// This should never happen
		assert(false && "No damage function found");
		return 0;
	}
	VMValue param = this;
	VMReturn result;

	int amount;

	result.IntAt(&amount);

	if (VMCall(DamageFunc, &param, 1, &result, 1) < 1)
	{ // No results
		return 0;
	}
	return amount;
}

void AActor::Howl ()
{
	FSoundID howl = SoundVar(NAME_HowlSound);
	if (!S_IsActorPlayingSomething(this, CHAN_BODY, howl))
	{
		S_Sound (this, CHAN_BODY, 0, howl, 1, ATTN_NORM);
	}
}

DEFINE_ACTION_FUNCTION(AActor, Howl)
{
	PARAM_SELF_PROLOGUE(AActor);
	self->Howl();
	return 0;
}

bool AActor::Slam (AActor *thing)
{
	if ((flags8 & MF8_ONLYSLAMSOLID)
		&& !(thing->flags & MF_SOLID) && !(thing->flags & MF_SHOOTABLE))
	{
		return true;
	}

	flags &= ~MF_SKULLFLY;
	Vel.Zero();
	if (health > 0)
	{
		if (!(flags2 & MF2_DORMANT))
		{
			int dam = GetMissileDamage (7, 1);
			int newdam = P_DamageMobj (thing, this, this, dam, NAME_Melee);
			P_TraceBleed (newdam > 0 ? newdam : dam, thing, this);
			// The charging monster may have died by the target's actions here.
			if (health > 0)
			{
				FState *slam = FindState(NAME_Slam);
				if (slam != NULL)
					SetState(slam);
				else if (SeeState != NULL && !(flags8 & MF8_RETARGETAFTERSLAM))
					SetState (SeeState);
				else
					SetIdle();
			}
		}
		else
		{
			SetIdle();
			tics = -1;
		}
	}
	return false;			// stop moving
}

DEFINE_ACTION_FUNCTION(AActor, Slam)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT(thing, AActor);
	ACTION_RETURN_BOOL(self->Slam(thing));
}

bool AActor::CallSlam(AActor *thing)
{
	IFVIRTUAL(AActor, Slam)
	{
		VMValue params[2] = { (DObject*)this, thing };
		VMReturn ret;
		int retval;
		ret.IntAt(&retval);
		VMCall(func, params, 2, &ret, 1);
		return !!retval;

	}
	else return Slam(thing);
}



// This virtual method only exists on the script side.
int AActor::SpecialMissileHit (AActor *victim)
{
	IFVIRTUAL(AActor, SpecialMissileHit)
	{
		VMValue params[2] = { (DObject*)this, victim };
		VMReturn ret;
		int retval;
		ret.IntAt(&retval);
		VMCall(func, params, 2, &ret, 1);
		return retval;
	}
	else return -1;
}

// This virtual method only exists on the script side.
int AActor::SpecialBounceHit(AActor* bounceMobj, line_t* bounceLine, secplane_t* bouncePlane)
{
	IFVIRTUAL(AActor, SpecialBounceHit)
	{
		VMValue params[4] = { (DObject*)this, bounceMobj, bounceLine, bouncePlane };
		VMReturn ret;
		int retval;
		ret.IntAt(&retval);
		VMCall(func, params, 4, &ret, 1);
		return retval;
	}
	else return -1;
}

bool AActor::AdjustReflectionAngle (AActor *thing, DAngle &angle)
{
	if (flags2 & MF2_DONTREFLECT) return true;
	if (thing->flags7 & MF7_THRUREFLECT) return false;
	// Change angle for reflection
	if (thing->flags4&MF4_SHIELDREFLECT)
	{
		// Shield reflection (from the Centaur)
		if ((flags7 & MF7_NOSHIELDREFLECT) || absangle(angle, thing->Angles.Yaw) > DAngle::fromDeg(45))
			return true;	// Let missile explode

		if (pr_reflect () < 128)
			angle += DAngle::fromDeg(45);
		else
			angle -= DAngle::fromDeg(45);

	}
	else if (thing->flags4&MF4_DEFLECT)
	{
		// deflect (like the Heresiarch)
		if(pr_reflect() < 128) 
			angle += DAngle::fromDeg(45);
		else 
			angle -= DAngle::fromDeg(45);
	}
	else
	{
		angle += DAngle::fromDeg((pr_reflect() % 16) - 8);
	}
	//Always check for AIMREFLECT, no matter what else is checked above.
	if (thing->flags7 & MF7_AIMREFLECT)
	{
		if (this->target != NULL)
		{
			A_Face(this, this->target);
		}
		else if (thing->target != NULL)
		{
			A_Face(this, thing->target);
		}
	}
	
	return false;
}

int AActor::AbsorbDamage(int damage, FName dmgtype, AActor *inflictor, AActor *source, int flags)
{
	AActor *next;
	for (AActor *item = Inventory; item != nullptr; item = next)
	{
		// [Player701] Remember the next item now in case the current item is destroyed later
		next = item->Inventory;
		IFVIRTUALPTRNAME(item, NAME_Inventory, AbsorbDamage)
		{
			VMValue params[7] = { item, damage, dmgtype.GetIndex(), &damage, inflictor, source, flags };
			VMCall(func, params, 7, nullptr, 0);
		}
	}
	return damage;
}

void AActor::AlterWeaponSprite(visstyle_t *vis)
{
	int changed = 0;
	TArray<AActor *> items;
	// This needs to go backwards through the items but the list has no backlinks.
	for (AActor *item = Inventory; item != nullptr; item = item->Inventory)
	{
		items.Push(item);
	}
	for(int i=items.Size()-1;i>=0;i--)
	{
		IFVIRTUALPTRNAME(items[i], NAME_Inventory, AlterWeaponSprite)
		{
			VMValue params[3] = { items[i], vis, &changed };
			VMCall(func, params, 3, nullptr, 0);
		}
	}
}

void AActor::PlayActiveSound ()
{
	if (ActiveSound.isvalid() && !S_IsActorPlayingSomething(this, CHAN_VOICE))
	{
		S_Sound (this, CHAN_VOICE, 0, ActiveSound, 1,
			(flags3 & MF3_FULLVOLACTIVE) ? ATTN_NONE : ATTN_IDLE);
	}
}

DEFINE_ACTION_FUNCTION(AActor, PlayActiveSound)
{
	PARAM_SELF_PROLOGUE(AActor);
	self->PlayActiveSound();
	return 0;
}

void AActor::PlayPushSound()
{
	FSoundID push = SoundVar(NAME_PushSound);
	if (!S_IsActorPlayingSomething(this, CHAN_BODY, push))
	{
		S_Sound(this, CHAN_BODY, 0, push, 1, ATTN_NORM);
	}
}

DEFINE_ACTION_FUNCTION(AActor, PlayPushSound)
{
	PARAM_SELF_PROLOGUE(AActor);
	self->PlayPushSound();
	return 0;
}

bool AActor::IsOkayToAttack (AActor *link)
{
	// Standard things to eliminate: an actor shouldn't attack itself,
	// or a non-shootable, dormant, non-player-and-non-monster actor.
	if (link == this)									return false;
	if (!(link->player||(link->flags3 & MF3_ISMONSTER)))return false;
	if (!(link->flags & MF_SHOOTABLE))					return false;
	if (link->flags2 & MF2_DORMANT)						return false;
	if (link->flags7 & MF7_NEVERTARGET)					return false; // NEVERTARGET means just that.

	// An actor shouldn't attack friendly actors. The reference depends
	// on the type of actor: for a player's actor, itself; for a projectile,
	// its target; and for a summoned minion, its tracer.
	AActor * Friend;
	if (flags5 & MF5_SUMMONEDMONSTER)					Friend = tracer;
	else if (flags & MF_MISSILE)						Friend = target;
	else if ((flags & MF_FRIENDLY) && FriendPlayer)		Friend = Level->Players[FriendPlayer-1]->mo;
	else												Friend = this;

	// Friend checks
	if (link == Friend)									return false;
	if (Friend == NULL)									return false;
	if (Friend->IsFriend(link))							return false;
	if ((link->flags5 & MF5_SUMMONEDMONSTER)			// No attack against minions on the same side
		&& (link->tracer == Friend))					return false;
	if (multiplayer && !deathmatch						// No attack against fellow players in coop
		&& link->player && Friend->player)				return false;
	if (((flags & link->flags) & MF_FRIENDLY)			// No friendly infighting amongst minions
		&& IsFriend(link))								return false;

	// Now that all the actor checks are made, the line of sight can be checked
	if (P_CheckSight (this, link))
	{
		// AMageStaffFX2::IsOkayToAttack had an extra check here, generalized with a flag,
		// to only allow the check to succeed if the enemy was in a ~84  FOV of the player
		if (flags3 & MF3_SCREENSEEKER)
		{
			DAngle angle = absangle(Friend->AngleTo(link), Friend->Angles.Yaw);
			if (angle < DAngle::fromDeg(30 * (256./360.)))
			{
				return true;
			}
		}
		// Other actors are not concerned by this check
		else return true;
	}
	// The sight check was failed, or the angle wasn't right for a screenseeker
	return false;
}

void AActor::SetShade (uint32_t rgb)
{
	PalEntry *entry = (PalEntry *)&rgb;
	fillcolor = (rgb & 0xffffff) | (ColorMatcher.Pick (entry->r, entry->g, entry->b) << 24);
}

void AActor::SetShade (int r, int g, int b)
{
	fillcolor = MAKEARGB(ColorMatcher.Pick (r, g, b), r, g, b);
}

DEFINE_ACTION_FUNCTION(AActor, SetShade)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_INT(color);
	self->SetShade(color);
	return 0;
}

// [MC] Helper function for Set(View)Pitch. 
DAngle AActor::ClampPitch(DAngle p)
{	
	// clamp the pitch we set
	DAngle min, max;

	if (player != nullptr)
	{
		min = player->MinPitch;
		max = player->MaxPitch;
	}
	else
	{
		min = DAngle::fromDeg(-89.);
		max = DAngle::fromDeg(89.);
	}
	p = clamp(p, min, max);
	return p;
}

void AActor::SetPitch(DAngle p, int fflags)
{
	if (player != nullptr || (fflags & SPF_FORCECLAMP))
	{
		p = ClampPitch(p);
	}

	if (p != Angles.Pitch)
	{
		if (player != nullptr)
		{
			const bool mustLerp = !P_NoInterpolation(player, this);

			if ((fflags & SPF_INTERPOLATE) || ((fflags & SPF_SCALEDNOLERP) && mustLerp))
			{
				Angles.Pitch = p;
				player->cheats |= CF_INTERPVIEW;
			}
			else if ((fflags & SPF_SCALEDNOLERP) && !mustLerp)
			{
				player->angleTargets.Pitch = deltaangle(Angles.Pitch, p);
				player->angleAppliedAmounts.Pitch = nullAngle;
				player->cheats |= CF_SCALEDNOLERP;
			}
			else
			{
				Angles.Pitch = p;
			}
		}
		else
		{
			Angles.Pitch = p;
		}
	}
	
}

void AActor::SetAngle(DAngle ang, int fflags)
{
	if (ang != Angles.Yaw)
	{
		if (player != nullptr)
		{
			const bool mustLerp = !P_NoInterpolation(player, this);

			if ((fflags & SPF_INTERPOLATE) || ((fflags & SPF_SCALEDNOLERP) && mustLerp))
			{
				Angles.Yaw = ang;
				player->cheats |= CF_INTERPVIEW;
			}
			else if ((fflags & SPF_SCALEDNOLERP) && !mustLerp)
			{
				player->angleTargets.Yaw = deltaangle(Angles.Yaw, ang);
				player->angleAppliedAmounts.Yaw = nullAngle;
				player->cheats |= CF_SCALEDNOLERP;
			}
			else
			{
				Angles.Yaw = ang;
			}
		}
		else
		{
			Angles.Yaw = ang;
		}
	}
	
}

void AActor::SetRoll(DAngle r, int fflags)
{
	if (r != Angles.Roll)
	{
		if (player != nullptr)
		{
			const bool mustLerp = !P_NoInterpolation(player, this);

			if ((fflags & SPF_INTERPOLATE) || ((fflags & SPF_SCALEDNOLERP) && mustLerp))
			{
				Angles.Roll = r;
				player->cheats |= CF_INTERPVIEW;
			}
			else if ((fflags & SPF_SCALEDNOLERP) && !mustLerp)
			{
				player->angleTargets.Roll = deltaangle(Angles.Roll, r);
				player->angleAppliedAmounts.Roll = nullAngle;
				player->cheats |= CF_SCALEDNOLERP;
			}
			else
			{
				Angles.Roll = r;
			}
		}
		else
		{
			Angles.Roll = r;
		}
	}
}

void AActor::SetViewPitch(DAngle p, int fflags)
{
	if (player != NULL || (fflags & SPF_FORCECLAMP))
	{
		p = ClampPitch(p);
	}

	if (p != ViewAngles.Pitch)
	{
		ViewAngles.Pitch = p;
		if (player != nullptr && (fflags & SPF_INTERPOLATE))
		{
			player->cheats |= CF_INTERPVIEWANGLES;
		}
	}

}

void AActor::SetViewAngle(DAngle ang, int fflags)
{
	if (ang != ViewAngles.Yaw)
	{
		ViewAngles.Yaw = ang;
		if (player != nullptr && (fflags & SPF_INTERPOLATE))
		{
			player->cheats |= CF_INTERPVIEWANGLES;
		}
	}

}

double AActor::GetFOV(double ticFrac)
{
	// [B] Disable interpolation when playing online, otherwise it gets vomit inducing
	if (netgame)
		return player ? player->FOV : CameraFOV;

	double fov;
	if (player)
	{
		if (player->cheats & CF_NOFOVINTERP)
			return player->FOV;

		fov = player->FOV;
	}
	else
	{
		fov = CameraFOV;
	}

	return PrevFOV.Degrees() * (1 - ticFrac) + fov * ticFrac;
}

void AActor::SetViewRoll(DAngle r, int fflags)
{
	if (r != ViewAngles.Roll)
	{
		ViewAngles.Roll = r;
		if (player != nullptr && (fflags & SPF_INTERPOLATE))
		{
			player->cheats |= CF_INTERPVIEWANGLES;
		}
	}
}

PClassActor *AActor::GetBloodType(int type) const
{
	IFVIRTUAL(AActor, GetBloodType)
	{
		VMValue params[] = { (DObject*)this, type };
		PClassActor *res;
		VMReturn ret((void**)&res);
		VMCall(func, params, countof(params), &ret, 1);
		return res;
	}
	return nullptr;
}


DVector3 AActor::GetPortalTransition(double byoffset, sector_t **pSec)
{
	bool moved = false;
	sector_t *sec = Sector;
	double testz = Z() + byoffset;
	DVector3 pos = Pos();

	while (!sec->PortalBlocksMovement(sector_t::ceiling))
	{
		if (testz >= sec->GetPortalPlaneZ(sector_t::ceiling))
		{
			pos = PosRelative(sec->GetOppositePortalGroup(sector_t::ceiling));
			sec = Level->PointInSector(pos);
			moved = true;
		}
		else break;
	}
	if (!moved)
	{
		while (!sec->PortalBlocksMovement(sector_t::floor))
		{
			if (testz < sec->GetPortalPlaneZ(sector_t::floor))
			{
				pos = PosRelative(sec->GetOppositePortalGroup(sector_t::floor));
				sec = Level->PointInSector(pos);
			}
			else break;
		}
	}
	if (pSec) *pSec = sec;
	return pos;
}



void AActor::CheckPortalTransition(bool islinked)
{
	bool moved = false;
	FLinkContext ctx;
	while (!Sector->PortalBlocksMovement(sector_t::ceiling))
	{
		if (Z() >= Sector->GetPortalPlaneZ(sector_t::ceiling))
		{
			DVector3 oldpos = Pos();
			if (islinked && !moved) UnlinkFromWorld(&ctx);
			SetXYZ(PosRelative(Sector->GetOppositePortalGroup(sector_t::ceiling)));
			Prev += Pos() - oldpos;
			Sector = Level->PointInSector(Pos());
			PrevPortalGroup = Sector->PortalGroup;
			moved = true;
		}
		else break;
	}
	if (!moved)
	{
		while (!Sector->PortalBlocksMovement(sector_t::floor))
		{
			double portalz = Sector->GetPortalPlaneZ(sector_t::floor);
			if (Z() < portalz && floorz < portalz)
			{
				DVector3 oldpos = Pos();
				if (islinked && !moved) UnlinkFromWorld(&ctx);
				SetXYZ(PosRelative(Sector->GetOppositePortalGroup(sector_t::floor)));
				Prev += Pos() - oldpos;
				Sector = Level->PointInSector(Pos());
				PrevPortalGroup = Sector->PortalGroup;
				moved = true;
			}
			else break;
		}
	}
	if (islinked && moved) LinkToWorld(&ctx);
}

DEFINE_ACTION_FUNCTION(AActor, CheckPortalTransition)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_BOOL(linked);
	self->CheckPortalTransition(linked);
	return 0;
}

//
// P_MobjThinker
//
void AActor::Tick ()
{
	// [RH] Data for Heretic/Hexen scrolling sectors
	static const int8_t HexenCompatSpeeds[] = {-25, 0, -10, -5, 0, 5, 10, 0, 25 };
	static const int8_t HexenScrollies[24][2] =
	{
		{  0,  1 }, {  0,  2 }, {  0,  4 },
		{ -1,  0 }, { -2,  0 }, { -4,  0 },
		{  0, -1 }, {  0, -2 }, {  0, -4 },
		{  1,  0 }, {  2,  0 }, {  4,  0 },
		{  1,  1 }, {  2,  2 }, {  4,  4 },
		{ -1,  1 }, { -2,  2 }, { -4,  4 },
		{ -1, -1 }, { -2, -2 }, { -4, -4 },
		{  1, -1 }, {  2, -2 }, {  4, -4 }
	};

	static const uint8_t HereticScrollDirs[4] = { 6, 9, 1, 4 };
	static const uint8_t HereticSpeedMuls[5] = { 5, 10, 25, 30, 35 };

	if (freezetics > 0)
	{
		freezetics--;
		return;
	}

	AActor *onmo;

	//assert (state != NULL);
	if (state == NULL)
	{
		Printf("Actor of type %s at (%f,%f) left without a state\n", GetClass()->TypeName.GetChars(), X(), Y());
		Destroy();
		return;
	}

	if (flags5 & MF5_NOINTERACTION)
	{
		// only do the minimally necessary things here to save time:
		// Check the time freezer
		// apply velocity
		// ensure that the actor is not linked into the blockmap

		//Added by MC: Freeze mode.
		if (isFrozen())
		{
			// Boss cubes shouldn't be accelerated by timefreeze
			if (flags6 & MF6_BOSSCUBE)
			{
				special2++;
			}
			return;
		}

		if (!Vel.isZero() || !(flags & MF_NOBLOCKMAP))
		{
			FLinkContext ctx;
			UnlinkFromWorld(&ctx);
			flags |= MF_NOBLOCKMAP;
			SetXYZ(Vec3Offset(Vel));
			CheckPortalTransition(false);
			LinkToWorld(&ctx);
		}
		flags8 &= ~MF8_INSCROLLSEC;
	}
	else
	{
		if (player)
			player->crossingPortal = false;
		if (!player || !(player->cheats & CF_PREDICTING))
		{
			// Handle powerup effects here so that the order is controlled
			// by the order in the inventory, not the order in the thinker table
			AActor *item = Inventory;
			
			while (item != NULL)
			{
				IFVIRTUALPTRNAME(item, NAME_Inventory, DoEffect)
				{
					VMValue params[1] = { item };
					VMCall(func, params, 1, nullptr, 0);
				}
				item = item->Inventory;
			}
		}

		if (flags & MF_UNMORPHED)
		{
			return;
		}

		if (isFrozen())
		{
			// Boss cubes shouldn't be accelerated by timefreeze
			if (flags6 & MF6_BOSSCUBE)
			{
				special2++;
			}
			return;
		}

		if (effects & FX_ROCKET) 
		{
			if (++smokecounter == 4)
			{
				// add some smoke behind the rocket 
				smokecounter = 0;
				AActor *th = Spawn(Level, "RocketSmokeTrail", Vec3Offset(-Vel), ALLOW_REPLACE);
				if (th)
				{
					th->tics -= pr_rockettrail()&3;
					if (th->tics < 1) th->tics = 1;
					if (!(cl_rockettrails & 2)) th->renderflags |= RF_INVISIBLE;
				}
			}
		}
		else if (effects & FX_GRENADE) 
		{
			if (++smokecounter == 8)
			{
				smokecounter = 0;
				DAngle moveangle = Vel.Angle();
				double xo = -moveangle.Cos() * radius * 2 + pr_rockettrail() / 64.;
				double yo = -moveangle.Sin() * radius * 2 + pr_rockettrail() / 64.;
				double zo = -Height * Vel.Z / 8. + Height * (2 / 3.);
				AActor * th = Spawn(Level, "GrenadeSmokeTrail", Vec3Offset(xo, yo, zo), ALLOW_REPLACE);
				if (th)
				{
					th->tics -= pr_rockettrail()&3;
					if (th->tics < 1) th->tics = 1;
					if (!(cl_rockettrails & 2)) th->renderflags |= RF_INVISIBLE;
				}
			}
		}

		double oldz = Z();

		// [RH] Give the pain elemental vertical friction
		// This used to be in APainElemental::Tick but in order to use
		// A_PainAttack with other monsters it has to be here
		if (flags4 & MF4_VFRICTION)
		{
			if (health >0)
			{
				if (fabs (Vel.Z) < 0.25)
				{
					Vel.Z = 0;
					flags4 &= ~MF4_VFRICTION;
				}
				else
				{
					Vel.Z *= (0xe800 / 65536.);
				}
			}
		}

		// [RH] Pulse in and out of visibility
		if (effects & FX_VISIBILITYPULSE)
		{
			if (visdir > 0)
			{
				Alpha += 1/32.;
				if (Alpha >= 1.)
				{
					Alpha = 1.;
					visdir = -1;
				}
			}
			else
			{
				Alpha -= 1/32.;
				if (Alpha <= 0.25)
				{
					Alpha = 0.25;
					visdir = 1;
				}
			}
		}
		else if (flags & MF_STEALTH)
		{
			// [RH] Fade a stealth monster in and out of visibility
			RenderStyle.Flags &= ~STYLEF_Alpha1;
			if (visdir > 0)
			{
				Alpha += 2./TICRATE;
				if (Alpha > 1.)
				{
					Alpha = 1.;
					visdir = 0;
				}
			}
			else if (visdir < 0)
			{
				Alpha -= 1.5/TICRATE;
				if (Alpha < StealthAlpha)
				{
					Alpha = StealthAlpha;
					visdir = 0;
				}
			}
		}

		if (Level->BotInfo.botnum && !demoplayback &&
			((flags & (MF_SPECIAL|MF_MISSILE)) || (flags3 & MF3_ISMONSTER)))
		{
			Level->BotInfo.BotTick(this);
		}

		// [RH] Consider carrying sectors here
		DVector2 cumm(0, 0);

		if ((((flags8 & MF8_INSCROLLSEC) && Level->Scrolls.Size() > 0) || player != NULL) && !(flags & MF_NOCLIP) && !(flags & MF_NOSECTOR))
		{
			double height, waterheight;	// killough 4/4/98: add waterheight
			const msecnode_t *node;
			int countx, county;

			// Clear the flag for the next frame.
			flags8 &= ~MF8_INSCROLLSEC;

			// killough 3/7/98: Carry things on floor
			// killough 3/20/98: use new sector list which reflects true members
			// killough 3/27/98: fix carrier bug
			// killough 4/4/98: Underwater, carry things even w/o gravity

			// Move objects only if on floor or underwater,
			// non-floating, and clipped.

			countx = county = 0;

			for (node = touching_sectorlist; node; node = node->m_tnext)
			{
				sector_t *sec = node->m_sector;
				DVector2 scrollv;

				if (Level->Scrolls.Size() > unsigned(sec->Index()))
				{
					scrollv = Level->Scrolls[sec->Index()];
				}
				else
				{
					scrollv.Zero();
				}

				if (player != NULL)
				{
					int scrolltype = sec->special;

					if (scrolltype >= Scroll_North_Slow &&
						scrolltype <= Scroll_SouthWest_Fast)
					{ // Hexen scroll special
						scrolltype -= Scroll_North_Slow;
						if (Level->i_compatflags&COMPATF_RAVENSCROLL)
						{
							scrollv.X -= HexenCompatSpeeds[HexenScrollies[scrolltype][0]+4] * (1. / (32 * CARRYFACTOR));
							scrollv.Y += HexenCompatSpeeds[HexenScrollies[scrolltype][1]+4] * (1. / (32 * CARRYFACTOR));

						}
						else
						{
							// Use speeds that actually match the scrolling textures!
							scrollv.X -= HexenScrollies[scrolltype][0] * 0.5;
							scrollv.Y += HexenScrollies[scrolltype][1] * 0.5;
						}
					}
					else if (scrolltype >= Carry_East5 &&
							 scrolltype <= Carry_West35)
					{ // Heretic scroll special
						scrolltype -= Carry_East5;
						uint8_t dir = HereticScrollDirs[scrolltype / 5];
						double carryspeed = HereticSpeedMuls[scrolltype % 5] * (1. / (32 * CARRYFACTOR));
						if (scrolltype < 5 && !(Level->i_compatflags&COMPATF_RAVENSCROLL))
						{
							// Use speeds that actually match the scrolling textures!
							carryspeed = (1 << ((scrolltype % 5) + 15)) / 65536.;
						}
						scrollv.X += carryspeed * ((dir & 3) - 1);
						scrollv.Y += carryspeed * (((dir & 12) >> 2) - 1);
					}
					else if (scrolltype == dScroll_EastLavaDamage)
					{ // Special Heretic scroll special
						if (Level->i_compatflags&COMPATF_RAVENSCROLL)
						{
							scrollv.X += 28. / (32*CARRYFACTOR);
						}
						else
						{
							// Use a speed that actually matches the scrolling texture!
							scrollv.X += 12. / (32 * CARRYFACTOR);
						}
					}
					else if (scrolltype == Scroll_StrifeCurrent)
					{ // Strife scroll special
						int anglespeed = Level->GetFirstSectorTag(sec) - 100;
						double carryspeed = (anglespeed % 10) / (16 * CARRYFACTOR);
						DAngle angle = DAngle::fromDeg(((anglespeed / 10) * 45.));
						scrollv += angle.ToVector(carryspeed);
					}
				}

				if (scrollv.isZero())
				{
					continue;
				}
				sector_t *heightsec = sec->GetHeightSec();
				if (flags & MF_NOGRAVITY && heightsec == NULL)
				{
					continue;
				}
				DVector3 pos = PosRelative(sec);
				height = sec->floorplane.ZatPoint (pos);
				double height2 = sec->floorplane.ZatPoint(this);
				if (isAbove(height))
				{
					if (heightsec == NULL)
					{
						continue;
					}

					waterheight = heightsec->floorplane.ZatPoint (pos);
					if (waterheight > height && Z() >= waterheight)
					{
						continue;
					}
				}

				cumm += scrollv;
				if (scrollv.X) countx++;
				if (scrollv.Y) county++;
			}

			// Some levels designed with Boom in mind actually want things to accelerate
			// at neighboring scrolling sector boundaries. But it is only important for
			// non-player objects.
			if (player != NULL || !(Level->i_compatflags & COMPATF_BOOMSCROLL))
			{
				if (countx > 1)
				{
					cumm.X /= countx;
				}
				if (county > 1)
				{
					cumm.Y /= county;
				}
			}
		}

		// [RH] If standing on a steep slope, fall down it
		if ((flags & MF_SOLID) && !(flags & (MF_NOCLIP|MF_NOGRAVITY)) &&
			!(flags & MF_NOBLOCKMAP) &&
			Vel.Z <= 0 &&
			floorz == Z())
		{
			secplane_t floorplane;

			// Check 3D floors as well
			floorplane = P_FindFloorPlane(floorsector, PosAtZ(floorz));

			if (floorplane.fC() < MaxSlopeSteepness &&
				floorplane.ZatPoint (PosRelative(floorsector)) <= floorz)
			{
				const msecnode_t *node;
				bool dopush = true;

				if (floorplane.fC() > MaxSlopeSteepness*2/3)
				{
					for (node = touching_sectorlist; node; node = node->m_tnext)
					{
						const sector_t *sec = node->m_sector;
						if (sec->floorplane.fC() >= MaxSlopeSteepness)
						{
							if (floorplane.ZatPoint(PosRelative(node->m_sector)) >= Z() - MaxStepHeight)
							{
								dopush = false;
								break;
							}
						}
					}
				}
				if (dopush)
				{
					Vel += floorplane.Normal().XY();
				}
			}
		}

		// [RH] Missiles moving perfectly vertical need some X/Y movement, or they
		// won't hurt anything. Don't do this if damage is 0! That way, you can
		// still have missiles that go straight up and down through actors without
		// damaging anything.
		// (for backwards compatibility this must check for lack of damage function, not for zero damage!)
		if ((flags & MF_MISSILE) && Vel.X == 0 && Vel.Y == 0 && !IsZeroDamage())
		{
			VelFromAngle(MinVel);
		}

		// Handle X and Y velocities
		BlockingMobj = nullptr;
		MovementBlockingLine = nullptr;
		sector_t* oldBlockingCeiling = BlockingCeiling;
		sector_t* oldBlockingFloor = BlockingFloor;
		Blocking3DFloor = nullptr;
		BlockingFloor = nullptr;
		BlockingCeiling = nullptr;
		double oldfloorz = P_XYMovement (this, cumm);
		if (ObjectFlags & OF_EuthanizeMe)
		{ // actor was destroyed
			return;
		}
		// [ZZ] trigger hit floor/hit ceiling actions from XY movement
		if (BlockingFloor && BlockingFloor != oldBlockingFloor && (!player || !(player->cheats & CF_PREDICTING)) && BlockingFloor->SecActTarget)
			BlockingFloor->TriggerSectorActions(this, SECSPAC_HitFloor);
		if (BlockingCeiling && BlockingCeiling != oldBlockingCeiling && (!player || !(player->cheats & CF_PREDICTING)) && BlockingCeiling->SecActTarget)
			BlockingCeiling->TriggerSectorActions(this, SECSPAC_HitCeiling);
		if (Vel.X == 0 && Vel.Y == 0) // Actors at rest
		{
			if (flags2 & MF2_BLASTED)
			{ // Reset to not blasted when velocities are gone
				flags2 &= ~MF2_BLASTED;
			}
			if ((flags6 & MF6_TOUCHY) && !IsSentient())
			{ // Arm a mine which has come to rest
				flags6 |= MF6_ARMED;
			}

		}
		if (Vel.Z != 0 || BlockingMobj || Z() != floorz)
		{	// Handle Z velocity and gravity
			if (((flags2 & MF2_PASSMOBJ) || (flags & MF_SPECIAL)) && !(Level->i_compatflags & COMPATF_NO_PASSMOBJ))
			{
				if (!(onmo = P_CheckOnmobj (this)))
				{
					P_ZMovement (this, oldfloorz);
					flags2 &= ~MF2_ONMOBJ;
				}
				else
				{
					if (player)
					{
						if (Vel.Z < Level->gravity * Sector->gravity * (-1./100)// -655.36f)
							&& !(flags&MF_NOGRAVITY))
						{
							PlayerLandedOnThing (this, onmo);
						}
					}
					if (onmo->Top() - Z() <= MaxStepHeight)
					{
						if (player && player->mo == this)
						{
							player->viewheight -= onmo->Top() - Z();
							double deltaview = player->GetDeltaViewHeight();
							if (deltaview > player->deltaviewheight)
							{
								player->deltaviewheight = deltaview;
							}
						} 
						SetZ(onmo->Top());
					}
					// Check for MF6_BUMPSPECIAL
					// By default, only players can activate things by bumping into them
					// We trigger specials as long as we are on top of it and not just when
					// we land on it. This could be considered as gravity making us continually
					// bump into it, but it also avoids having to worry about walking on to
					// something without dropping and not triggering anything.
					if ((onmo->flags6 & MF6_BUMPSPECIAL) && ((player != NULL)
						|| ((onmo->activationtype & THINGSPEC_MonsterTrigger) && (flags3 & MF3_ISMONSTER))
						|| ((onmo->activationtype & THINGSPEC_MissileTrigger) && (flags & MF_MISSILE))
						) && (Level->maptime > onmo->lastbump)) // Leave the bumper enough time to go away
					{
						if (player == NULL || !(player->cheats & CF_PREDICTING))
						{
							if (P_ActivateThingSpecial(onmo, this))
								onmo->lastbump = Level->maptime + TICRATE;
						}
					}
					if (Vel.Z != 0 && (BounceFlags & BOUNCE_Actors))
					{
						bool res = P_BounceActor(this, onmo, true);
						// If the bouncer is a missile and has hit the other actor it needs to be exploded here
						// to be in line with the case when an actor's side is hit.
						if (!res && (flags & MF_MISSILE))
						{
							P_DoMissileDamage(this, onmo);
							P_ExplodeMissile(this, nullptr, onmo);
						}
					}
					else
					{
						flags2 |= MF2_ONMOBJ;
						Vel.Z = 0;
						Crash();
					}
				}
			}
			else
			{
				P_ZMovement (this, oldfloorz);
			}

			if (ObjectFlags & OF_EuthanizeMe)
				return;		// actor was destroyed
		}
		else if (Z() <= floorz)
		{
			Crash();
			if (ObjectFlags & OF_EuthanizeMe)
				return;		// actor was destroyed
		}

		CheckPortalTransition(true);

		UpdateWaterLevel ();

		// [RH] Don't advance if predicting a player
		if (player && (player->cheats & CF_PREDICTING))
		{
			return;
		}

		// Check for poison damage, but only once per PoisonPeriod tics (or once per second if none).
		if (PoisonDurationReceived && (Level->time % (PoisonPeriodReceived ? PoisonPeriodReceived : TICRATE) == 0))
		{
			P_DamageMobj(this, NULL, Poisoner, PoisonDamageReceived, PoisonDamageTypeReceived != NAME_None ? PoisonDamageTypeReceived : (FName)NAME_Poison, 0);

			--PoisonDurationReceived;

			// Must clear damage when duration is done, otherwise it
			// could be added to with ADDITIVEPOISONDAMAGE.
			if (!PoisonDurationReceived) PoisonDamageReceived = 0;
		}
	}

	assert (state != NULL);
	if (state == NULL)
	{
		Destroy();
		return;
	}
	if (!CheckNoDelay())
		return; // freed itself

	UpdateRenderSectorList();

	if (Sector->Flags & SECF_KILLMONSTERS && Z() == floorz &&
		player == nullptr && (flags & MF_SHOOTABLE) && !(flags & MF_FLOAT))
	{
		P_DamageMobj(this, nullptr, nullptr, TELEFRAG_DAMAGE, NAME_InstantDeath);
		// must have been removed
		if (ObjectFlags & OF_EuthanizeMe) return;
	}

	if (tics != -1)
	{
		// cycle through states, calling action functions at transitions
		// [RH] Use tics <= 0 instead of == 0 so that spawnstates
		// of 0 tics work as expected.
		if (--tics <= 0)
		{
			if (!SetState(state->GetNextState()))
				return; 		// freed itself
		}
	}

	if (tics == -1 || state->GetCanRaise())
	{
		int respawn_monsters = G_SkillProperty(SKILLP_Respawn);
		// check for nightmare respawn
		if (!(flags5 & MF5_ALWAYSRESPAWN))
		{
			if (!respawn_monsters || !(flags3 & MF3_ISMONSTER) || (flags2 & MF2_DORMANT) || (flags5 & MF5_NEVERRESPAWN))
				return;

			int limit = G_SkillProperty (SKILLP_RespawnLimit);
			if (limit > 0 && skillrespawncount >= limit)
				return;
		}

		movecount++;

		if (movecount < respawn_monsters)
			return;

		if (Level->time & 31)
			return;

		if (pr_nightmarerespawn() > 4)
			return;

		P_NightmareRespawn (this);
	}
}

//==========================================================================
//
// AActor :: CheckNoDelay
//
//==========================================================================

bool AActor::CheckNoDelay()
{
	if ((flags7 & MF7_HANDLENODELAY) && !(flags2 & MF2_DORMANT))
	{
		flags7 &= ~MF7_HANDLENODELAY;
		if (state->GetNoDelay())
		{
			// For immediately spawned objects with the NoDelay flag set for their
			// Spawn state, explicitly call the current state's function.
			FState *newstate;
			FStateParamInfo stp = { state, STATE_Actor, PSP_WEAPON };
			if (state->CallAction(this, this, &stp, &newstate))
			{
				if (ObjectFlags & OF_EuthanizeMe)
				{
					return false;		// freed itself
				}
				if (newstate != NULL)
				{
					return SetState(newstate);
				}
			}
		}
	}
	return true;
}

DEFINE_ACTION_FUNCTION(AActor, CheckNoDelay)
{
	PARAM_SELF_PROLOGUE(AActor);
	ACTION_RETURN_BOOL(self->CheckNoDelay());
}

//==========================================================================
//
// AActor :: CheckSectorTransition
//
// Fire off some sector triggers if the actor has changed sectors.
//
//==========================================================================

void AActor::CheckSectorTransition(sector_t *oldsec)
{
	if (oldsec != Sector)
	{
		if (oldsec->SecActTarget != NULL)
		{
			oldsec->TriggerSectorActions(this, SECSPAC_Exit);
		}
		if (Sector->SecActTarget != NULL)
		{
			int act = SECSPAC_Enter;
			if (Z() <= Sector->floorplane.ZatPoint(this))
			{
				act |= SECSPAC_HitFloor;
			}
			if (Top() >= Sector->ceilingplane.ZatPoint(this))
			{
				act |= SECSPAC_HitCeiling;
			}
			if (Sector->heightsec != NULL && Z() == Sector->heightsec->floorplane.ZatPoint(this))
			{
				act |= SECSPAC_HitFakeFloor;
			}
			Sector->TriggerSectorActions(this, act);
		}
		if (Z() == floorz)
		{
			P_CheckFor3DFloorHit(this, Z(), true);
		}
		if (Top() == ceilingz)
		{
			P_CheckFor3DCeilingHit(this, Top(), true);
		}
	}
}

//==========================================================================
//
// UpdateWaterDepth
//
// Updates the actor's current waterlevel and waterdepth.
// Consolidates common code in UpdateWaterLevel and SplashCheck.
//
// Returns the floor height used for the depth check, or -FLT_MAX
// if the actor wasn't in a sector.
//
//==========================================================================

static double UpdateWaterDepth(AActor* actor, bool splash)
{
	double fh = -FLT_MAX;
	bool reset = false;

	actor->waterlevel = 0;
	actor->waterdepth = 0;

	if (actor->Sector == NULL)
	{
		return fh;
	}

	if (actor->Sector->MoreFlags & SECMF_UNDERWATER)	// intentionally not SECMF_UNDERWATERMASK
	{
		actor->waterdepth = actor->Height;
	}
	else
	{
		const sector_t *hsec = actor->Sector->GetHeightSec();
		if (hsec != NULL)
		{
			fh = hsec->floorplane.ZatPoint(actor);

			// splash checks also check Boom-style non-swimmable sectors
			//  as well as non-solid, visible 3D floors (below)
			if (splash || hsec->MoreFlags & SECMF_UNDERWATERMASK)
			{
				actor->waterdepth = fh - actor->Z();

				if (actor->waterdepth <= 0 && !(hsec->MoreFlags & SECMF_FAKEFLOORONLY) && (actor->Top() > hsec->ceilingplane.ZatPoint(actor)))
				{
					actor->waterdepth = actor->Height;
				}
			}
		}
		else
		{
			// Check 3D floors as well!
			for (auto rover : actor->Sector->e->XFloor.ffloors)
			{
				if (!(rover->flags & FF_EXISTS)) continue;
				if (rover->flags & FF_SOLID) continue;

				bool reset = !(rover->flags & FF_SWIMMABLE);
				if (splash) { reset &= rover->alpha == 0; }
				if (reset) continue;

				double ff_bottom = rover->bottom.plane->ZatPoint(actor);
				double ff_top = rover->top.plane->ZatPoint(actor);

				if (ff_top <= actor->Z() || ff_bottom > actor->Center()) continue;

				fh = ff_top;
				actor->waterdepth = ff_top - actor->Z();
				break;
			}
		}
	}

	if (actor->waterdepth < 0) { actor->waterdepth = 0; }

	if (actor->waterdepth > (actor->Height / 2))
	{
		// When noclipping around and going from low to high sector, your view height
		//  can go negative, which is why this is nested inside here
		if ((actor->player && (actor->waterdepth >= actor->player->viewheight)) || (actor->waterdepth >= actor->Height))
		{
			actor->waterlevel = 3;
		}
		else
		{
			actor->waterlevel = 2;
		}
	}
	else if (actor->waterdepth > 0)
	{
		actor->waterlevel = 1;
	}

	return fh;
}

//==========================================================================
//
// AActor::SplashCheck
//
// Returns true if actor should splash
//
//==========================================================================

void AActor::SplashCheck()
{
	double fh = UpdateWaterDepth(this, true);

	// some additional checks to make deep sectors like Boom's splash without setting
	// the water flags. 
	if (boomwaterlevel == 0 && waterlevel != 0)
	{
		P_HitWater(this, Sector, PosAtZ(fh), true);
	}
	boomwaterlevel = waterlevel;
	return;
}

//==========================================================================
//
// AActor::UpdateWaterLevel
//
// Returns true if actor should splash
//
//==========================================================================

bool AActor::UpdateWaterLevel(bool dosplash)
{
	int oldlevel = waterlevel;

	if (dosplash) SplashCheck();
	UpdateWaterDepth(this, false);

	// Play surfacing and diving sounds, as appropriate.
	//
	// (used to be that this code was wrapped around a "Sector != nullptr" check,
	//  but actors should always be within a sector, and besides, this is just
	//  sound stuff)

	if (player != nullptr)
	{
		if (oldlevel < 3 && waterlevel == 3)
		{
			// Our head just went under.
			S_Sound(this, CHAN_VOICE, 0, "*dive", 1, ATTN_NORM);
		}
		else if (oldlevel == 3 && waterlevel < 3)
		{
			// Our head just came up.
			if (player->air_finished > Level->maptime)
			{
				// We hadn't run out of air yet.
				S_Sound(this, CHAN_VOICE, 0, "*surface", 1, ATTN_NORM);
			}
			// If we were running out of air, then ResetAirSupply() will play *gasp.
		}
	}

	return false;	// we did the splash ourselves
}

DEFINE_ACTION_FUNCTION(AActor, UpdateWaterLevel)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_BOOL(splash);
	ACTION_RETURN_BOOL(self->UpdateWaterLevel(splash));
}

//==========================================================================
//
// P_SpawnMobj
//
//==========================================================================

void ConstructActor(AActor *actor, const DVector3 &pos, bool SpawningMapThing)
{
	auto Level = actor->Level;
	actor->SpawnTime = Level->totaltime;
	actor->SpawnOrder = Level->spawnindex++;

	// Set default dialogue
	actor->ConversationRoot = Level->GetConversation(actor->GetClass()->TypeName);
	if (actor->ConversationRoot != -1)
	{
		actor->Conversation = Level->StrifeDialogues[actor->ConversationRoot];
	}
	else
	{
		actor->Conversation = NULL;
	}

	actor->SetXYZ(pos);
	actor->OldRenderPos = { FLT_MAX, FLT_MAX, FLT_MAX };
	actor->picnum.SetInvalid();
	actor->health = actor->SpawnHealth();

	// Actors with zero gravity need the NOGRAVITY flag set.
	if (actor->Gravity == 0) actor->flags |= MF_NOGRAVITY;

	FRandom &rng = Level->BotInfo.m_Thinking ? pr_botspawnmobj : pr_spawnmobj;

	if ((!!G_SkillProperty(SKILLP_InstantReaction) || actor->flags5 & MF5_ALWAYSFAST || !!(dmflags & DF_INSTANT_REACTION))
		&& actor->flags3 & MF3_ISMONSTER)
		actor->reactiontime = 0;

	if (actor->flags3 & MF3_ISMONSTER)
	{
		actor->LastLookPlayerNumber = rng() % MAXPLAYERS;
		actor->TIDtoHate = 0;
	}

	// Set the state, but do not use SetState, because action
	// routines can't be called yet.  If the spawnstate has an action
	// routine, it will not be called.
	FState *st = actor->SpawnState;
	actor->state = st;
	actor->tics = st->GetTics();
	
	actor->sprite = st->sprite;
	actor->frame = st->GetFrame();
	actor->renderflags = (actor->renderflags & ~RF_FULLBRIGHT) | ActorRenderFlags::FromInt (st->GetFullbright());
	actor->touching_sectorlist = nullptr;	// NULL head of sector list // phares 3/13/98
	actor->touching_rendersectors = nullptr;
	if (G_SkillProperty(SKILLP_FastMonsters))
	{
		double f = actor->FloatVar(NAME_FastSpeed);
		if (f >= 0) actor->Speed = f;
	}

	// set subsector and/or block links
	actor->LinkToWorld (nullptr, SpawningMapThing);
	actor->ClearInterpolation();
	actor->ClearFOVInterpolation();

	actor->dropoffz = actor->floorz = actor->Sector->floorplane.ZatPoint(pos);
	actor->ceilingz = actor->Sector->ceilingplane.ZatPoint(pos);

	// The z-coordinate needs to be set once before calling P_FindFloorCeiling
	// For FLOATRANDZ just use the floor here.
	if (pos.Z == ONFLOORZ || pos.Z == FLOATRANDZ)
	{
		actor->SetZ(actor->floorz);
	}
	else if (pos.Z == ONCEILINGZ)
	{
		actor->SetZ(actor->ceilingz - actor->Height);
	}

	if (SpawningMapThing || !actor->IsKindOf (NAME_PlayerPawn))
	{
		// Check if there's something solid to stand on between the current position and the
		// current sector's floor. For map spawns this must be delayed until after setting the
		// z-coordinate.
		if (!SpawningMapThing) 
		{
			P_FindFloorCeiling(actor, FFCF_ONLYSPAWNPOS);
		}
		else
		{
			actor->floorsector = actor->Sector;
			actor->floorpic = actor->floorsector->GetTexture(sector_t::floor);
			actor->floorterrain = actor->floorsector->GetTerrain(sector_t::floor);
			actor->ceilingsector = actor->Sector;
			actor->ceilingpic = actor->ceilingsector->GetTexture(sector_t::ceiling);
		}
	}
	else if (!(actor->flags5 & MF5_NOINTERACTION))
	{
		P_FindFloorCeiling (actor);
	}
	else
	{
		actor->floorpic = actor->Sector->GetTexture(sector_t::floor);
		actor->floorterrain = actor->Sector->GetTerrain(sector_t::floor);
		actor->floorsector = actor->Sector;
		actor->ceilingpic = actor->Sector->GetTexture(sector_t::ceiling);
		actor->ceilingsector = actor->Sector;
	}

	actor->SpawnPoint.X = pos.X;
	actor->SpawnPoint.Y = pos.Y;
	// do not copy Z!

	if (pos.Z == ONFLOORZ)
	{
		actor->SetZ(actor->floorz);
	}
	else if (pos.Z == ONCEILINGZ)
	{
		actor->SetZ(actor->ceilingz - actor->Height);
	}
	else if (pos.Z == FLOATRANDZ)
	{
		double space = actor->ceilingz - actor->Height - actor->floorz;
		if (space > 48)
		{
			space -= 40;
			actor->SetZ( space * rng() / 256. + actor->floorz + 40);
		}
		else
		{
			actor->SetZ(actor->floorz);
		}
	}
	else
	{
		actor->SpawnPoint.Z = (actor->Z() - actor->Sector->floorplane.ZatPoint(actor));
	}

	if (actor->FloatBobPhase == (uint8_t)-1) actor->FloatBobPhase = rng();	// Don't make everything bob in sync (unless deliberately told to do)
	if (actor->flags2 & MF2_FLOORCLIP)
	{
		actor->AdjustFloorClip ();
	}
	else
	{
		actor->Floorclip = 0;
	}
	actor->UpdateWaterLevel (false);
	if (!SpawningMapThing)
	{
		actor->CallBeginPlay ();
		if (actor->ObjectFlags & OF_EuthanizeMe)
		{
			return;
		}
	}
	if (Level->flags & LEVEL_NOALLIES && !actor->IsKindOf(NAME_PlayerPawn))
	{
		actor->flags &= ~MF_FRIENDLY;
	}
	// [RH] Count monsters whenever they are spawned.
	if (actor->CountsAsKill())
	{
		Level->total_monsters++;
	}
	// [RH] Same, for items
	if (actor->flags & MF_COUNTITEM)
	{
		Level->total_items++;
	}
	// And for secrets
	if (actor->flags5 & MF5_COUNTSECRET)
	{
		Level->total_secrets++;
	}
	// force scroller check in the first tic.
	actor->flags8 |= MF8_INSCROLLSEC;
}


AActor *AActor::StaticSpawn(FLevelLocals *Level, PClassActor *type, const DVector3 &pos, replace_t allowreplacement, bool SpawningMapThing)
{
	if (type == NULL)
	{
		I_Error("Tried to spawn a class-less actor\n");
	}
	else if (type->bAbstract)
	{
		// [Player701] Abstract actors cannot be spawned by any means
		Printf("Attempt to spawn an instance of abstract actor class %s\n", type->TypeName.GetChars());
		return nullptr;
	}

	if (allowreplacement)
	{
		type = type->GetReplacement(Level);
	}

	AActor *actor;

	actor = static_cast<AActor *>(Level->CreateThinker(type));

	ConstructActor(actor, pos, SpawningMapThing);
	return actor;
}

DEFINE_ACTION_FUNCTION(AActor, Spawn)
{
	PARAM_PROLOGUE;
	PARAM_CLASS_NOT_NULL(type, AActor);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_INT(flags);
	ACTION_RETURN_OBJECT(AActor::StaticSpawn(currentVMLevel, type, DVector3(x, y, z), replace_t(flags)));
}

PClassActor *ClassForSpawn(FName classname)
{
	PClass *cls = PClass::FindClass(classname);
	if (cls == NULL)
	{
		I_Error("Attempt to spawn actor of unknown type '%s'\n", classname.GetChars());
	}
	if (!cls->IsDescendantOf(RUNTIME_CLASS(AActor)))
	{
		I_Error("Attempt to spawn non-actor of type '%s'\n", classname.GetChars());
	}
	return static_cast<PClassActor*>(cls);
}

void AActor::LevelSpawned ()
{
	if (tics > 0 && !(flags4 & MF4_SYNCHRONIZED))
	{
		tics = 1 + (pr_spawnmapthing() % tics);
	}
	// [RH] Clear MF_DROPPED flag if the default version doesn't have it set.
	// (Inventory.BeginPlay() makes all inventory items spawn with it set.)
	if (!(GetDefault()->flags & MF_DROPPED))
	{
		flags &= ~MF_DROPPED;
	}
	HandleSpawnFlags ();
}

void AActor::HandleSpawnFlags ()
{
	if (SpawnFlags & MTF_AMBUSH)
	{
		flags |= MF_AMBUSH;
	}
	if (SpawnFlags & MTF_DORMANT)
	{
		CallDeactivate (NULL);
	}
	if (SpawnFlags & MTF_STANDSTILL)
	{
		flags4 |= MF4_STANDSTILL;
	}
	if (SpawnFlags & MTF_FRIENDLY)
	{
		flags |= MF_FRIENDLY;
		// Friendlies don't count as kills!
		if (flags & MF_COUNTKILL)
		{
			flags &= ~MF_COUNTKILL;
			Level->total_monsters--;
		}
	}
	if (SpawnFlags & MTF_SHADOW)
	{
		flags |= MF_SHADOW;
		RenderStyle = STYLE_Translucent;
		Alpha = 0.25;
	}
	else if (SpawnFlags & MTF_ALTSHADOW)
	{
		RenderStyle = STYLE_None;
	}
	if (SpawnFlags & MTF_SECRET)
	{
		if (!(flags5 & MF5_COUNTSECRET))
		{
			//Printf("Secret %s in sector %i!\n", GetTag(), Sector->sectornum);
			flags5 |= MF5_COUNTSECRET;
			Level->total_secrets++;
		}
	}
	if (SpawnFlags & MTF_NOCOUNT)
	{
		if (flags & MF_COUNTKILL)
		{
			flags &= ~MF_COUNTKILL;
			Level->total_monsters--;
		}
		if (flags & MF_COUNTITEM)
		{
			flags &= ~MF_COUNTITEM;
			Level->total_items--;
		}
	}
}

DEFINE_ACTION_FUNCTION(AActor, HandleSpawnFlags)
{
	PARAM_SELF_PROLOGUE(AActor);
	self->HandleSpawnFlags();
	return 0;
}

void AActor::BeginPlay ()
{
	// If the actor is spawned with the dormant flag set, clear it, and use
	// the normal deactivation logic to make it properly dormant.
	if (flags2 & MF2_DORMANT)
	{
		flags2 &= ~MF2_DORMANT;
		CallDeactivate (NULL);
	}
}

DEFINE_ACTION_FUNCTION(AActor, BeginPlay)
{
	PARAM_SELF_PROLOGUE(AActor);
	self->BeginPlay();
	return 0;
}

void AActor::CallBeginPlay()
{
	IFVIRTUAL(AActor, BeginPlay)
	{
		// Without the type cast this picks the 'void *' assignment...
		VMValue params[1] = { (DObject*)this };
		VMCall(func, params, 1, nullptr, 0);
	}
	else BeginPlay();
}


void AActor::PostBeginPlay ()
{
	PrevAngles = Angles;
	flags7 |= MF7_HANDLENODELAY;
	if (GetInfo()->LightAssociations.Size() || (state && state->Light > 0))
	{
		flags8 |= MF8_RECREATELIGHTS;
		Level->flags3 |= LEVEL3_LIGHTCREATED;
	}
}

void AActor::CallPostBeginPlay()
{
	Super::CallPostBeginPlay();
	Level->localEventManager->WorldThingSpawned(this);
}

bool AActor::isFast()
{
	if (flags5&MF5_ALWAYSFAST) return true;
	if (flags5&MF5_NEVERFAST) return false;
	return !!G_SkillProperty(SKILLP_FastMonsters);
}

bool AActor::isSlow()
{
	return !!G_SkillProperty(SKILLP_SlowMonsters);
}

//===========================================================================
//
// Activate
//
//===========================================================================

void AActor::Activate (AActor *activator)
{
	if ((flags3 & MF3_ISMONSTER) && (health > 0 || (flags & MF_ICECORPSE)))
	{
		if (flags2 & MF2_DORMANT)
		{
			flags2 &= ~MF2_DORMANT;
			FState *state = FindState(NAME_Active);
			if (state != NULL) 
			{
				SetState(state);
			}
			else
			{
				tics = 1;
			}
		}
	}
}

DEFINE_ACTION_FUNCTION(AActor, Activate)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT(activator, AActor);
	self->Activate(activator);
	return 0;
}

void AActor::CallActivate(AActor *activator)
{
	IFVIRTUAL(AActor, Activate)
	{
		// Without the type cast this picks the 'void *' assignment...
		VMValue params[2] = { (DObject*)this, (DObject*)activator };
		VMCall(func, params, 2, nullptr, 0);
	}
	else Activate(activator);
}


//===========================================================================
//
// Deactivate
//
//===========================================================================

void AActor::Deactivate (AActor *activator)
{
	if ((flags3 & MF3_ISMONSTER) && (health > 0 || (flags & MF_ICECORPSE)))
	{
		if (!(flags2 & MF2_DORMANT))
		{
			flags2 |= MF2_DORMANT;
			FState *state = FindState(NAME_Inactive);
			if (state != NULL) 
			{
				SetState(state);
			}
			else
			{
				tics = -1;
			}
		}
	}
}

DEFINE_ACTION_FUNCTION(AActor, Deactivate)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT(activator, AActor);
	self->Deactivate(activator);
	return 0;
}

void AActor::CallDeactivate(AActor *activator)
{
	IFVIRTUAL(AActor, Deactivate)
	{
		// Without the type cast this picks the 'void *' assignment...
		VMValue params[2] = { (DObject*)this, (DObject*)activator };
		VMCall(func, params, 2, nullptr, 0);
	}
	else Deactivate(activator);
}

//===========================================================================
//
// Destroy
//
//===========================================================================

void AActor::OnDestroy ()
{
	// [ZZ] call destroy event hook.
	//      note that this differs from ThingSpawned in that you can actually override OnDestroy to avoid calling the hook.
	//      but you can't really do that without utterly breaking the game, so it's ok.
	//      note: if OnDestroy is ever made optional, E_WorldThingDestroyed should still be called for ANY thing.
	if (Level != nullptr)
	{
		Level->localEventManager->WorldThingDestroyed(this);
	}

	DeleteAttachedLights();
	ClearRenderSectorList();
	ClearRenderLineList();

	// [RH] Destroy any inventory this actor is carrying
	DestroyAllInventory (this);

	// [RH] Unlink from tid chain
	RemoveFromHash ();

	// unlink from sector and block lists
	UnlinkFromWorld (nullptr);
	flags |= MF_NOSECTOR|MF_NOBLOCKMAP;

	if (ViewPos != nullptr)
	{
		ViewPos->Destroy();
		ViewPos = nullptr;
	}

	// Transform any playing sound into positioned, non-actor sounds.
	S_RelinkSound (this, NULL);

	Super::OnDestroy();
}

//===========================================================================
//
// AdjustFloorClip
//
//===========================================================================

void AActor::AdjustFloorClip ()
{
	if (flags3 & MF3_SPECIALFLOORCLIP)
	{
		return;
	}

	double oldclip = Floorclip;
	double shallowestclip = INT_MAX;
	const msecnode_t *m;

	// [RH] clip based on shallowest floor player is standing on
	// If the sector has a deep water effect, then let that effect
	// do the floorclipping instead of the terrain type.
	for (m = touching_sectorlist; m; m = m->m_tnext)
	{
		DVector3 pos = PosRelative(m->m_sector);
		sector_t* hsec = m->m_sector->GetHeightSec();
		if (hsec == NULL)
		{
			if (m->m_sector->floorplane.ZatPoint(pos) == Z())
			{
				double clip = Terrains[m->m_sector->GetTerrain(sector_t::floor)].FootClip;
				if (clip < shallowestclip)
				{
					shallowestclip = clip;
				}
			}
			else
			{
				for (auto& ff : m->m_sector->e->XFloor.ffloors)
				{
					if ((ff->flags & FF_SOLID) && (ff->flags & FF_EXISTS) && ff->top.plane->ZatPoint(pos) == Z())
					{
						double clip = Terrains[ff->top.model->GetTerrain(ff->top.isceiling)].FootClip;
						if (clip < shallowestclip)
						{
							shallowestclip = clip;
						}
					}
				}

			}
		}
	}
	if (shallowestclip == INT_MAX)
	{
		Floorclip = 0;
	}
	else
	{
		Floorclip = shallowestclip;
	}
	if (player && player->mo == this && oldclip != Floorclip)
	{
		player->viewheight -= (oldclip - Floorclip);
		player->deltaviewheight = player->GetDeltaViewHeight();
	}
}

DEFINE_ACTION_FUNCTION(AActor, AdjustFloorClip)
{
	PARAM_SELF_PROLOGUE(AActor);
	self->AdjustFloorClip();
	return 0;
}

//
// P_SpawnPlayer
// Called when a player is spawned on the level.
// Most of the player structure stays unchanged between levels.
//
EXTERN_CVAR (Bool, chasedemo)
EXTERN_CVAR(Bool, sv_singleplayerrespawn)
EXTERN_CVAR(Float, fov)

extern bool demonew;

//==========================================================================
//
// This once was the main method for pointer cleanup, but
// nowadays its only use is swapping out PlayerPawns.
// This requires pointer fixing throughout all objects and a few
// global variables, but it only needs to look at pointers that
// can point to a player.
//
//==========================================================================

void StaticPointerSubstitution(AActor* old, AActor* notOld)
{
	DObject* probe;
	size_t changed = 0;
	int i;

	if (old == nullptr) return;

	// This is only allowed to replace players or swap out morphed monsters
	if (!old->IsKindOf(NAME_PlayerPawn) || (notOld != nullptr && !notOld->IsKindOf(NAME_PlayerPawn)))
	{
		if (notOld == nullptr) return;
		if (!old->IsKindOf(NAME_MorphedMonster) && !notOld->IsKindOf(NAME_MorphedMonster)) return;
	}
	// Go through all objects.
	i = 0; DObject* last = 0;
	for (probe = GC::Root; probe != NULL; probe = probe->ObjNext)
	{
		i++;
		changed += probe->PointerSubstitution(old, notOld);
		last = probe;
	}

	// Go through players.
	for (i = 0; i < MAXPLAYERS; i++)
	{
		if (playeringame[i])
		{
			AActor* replacement = notOld;
			auto& p = players[i];

			if (p.mo == old)					p.mo = replacement, changed++;
			if (p.poisoner.ForceGet() == old)			p.poisoner = replacement, changed++;
			if (p.attacker.ForceGet() == old)			p.attacker = replacement, changed++;
			if (p.camera.ForceGet() == old)				p.camera = replacement, changed++;
			if (p.ConversationNPC.ForceGet() == old)	p.ConversationNPC = replacement, changed++;
			if (p.ConversationPC.ForceGet() == old)		p.ConversationPC = replacement, changed++;
		}
	}

	// Go through sectors. Only the level this actor belongs to is relevant.
	for (auto& sec : old->Level->sectors)
	{
		if (sec.SoundTarget == old) sec.SoundTarget = notOld;
	}
}

void FLevelLocals::PlayerSpawnPickClass (int playernum)
{
	auto p = Players[playernum];

	if (p->cls == NULL)
	{
		// [GRB] Pick a class from player class list
		if (PlayerClasses.Size () > 1)
		{
			int type;

			if (!deathmatch || !multiplayer)
			{
				type = SinglePlayerClass[playernum];
			}
			else
			{
				type = p->userinfo.GetPlayerClassNum();
				if (type < 0)
				{
					type = pr_multiclasschoice() % PlayerClasses.Size ();
				}
			}
			p->CurrentPlayerClass = type;
		}
		else
		{
			p->CurrentPlayerClass = 0;
		}
		p->cls = PlayerClasses[p->CurrentPlayerClass].Type;
	}
}

AActor *FLevelLocals::SpawnPlayer (FPlayerStart *mthing, int playernum, int flags)
{
	player_t *p;
	AActor *mobj, *oldactor;
	uint8_t	  state;
	DVector3 spawn;
	DAngle SpawnAngle;

	if (mthing == NULL)
	{
		return NULL;
	}
	// not playing?
	if ((unsigned)playernum >= (unsigned)MAXPLAYERS || !PlayerInGame(playernum) )
		return NULL;

	// Old lerp data needs to go
	if (playernum == consoleplayer)
	{
		P_PredictionLerpReset();
	}

	p = Players[playernum];

	PlayerSpawnPickClass(playernum);

	if (( dmflags2 & DF2_SAME_SPAWN_SPOT ) &&
		( p->playerstate == PST_REBORN ) &&
		( deathmatch == false ) &&
		( gameaction != ga_worlddone ) &&
		( p->mo != NULL ) && 
		( !(p->mo->Sector->Flags & SECF_NORESPAWN) ) &&
		( NULL != p->attacker ) &&							// don't respawn on damaging floors
		( p->mo->Sector->damageamount < TELEFRAG_DAMAGE ))	// this really should be a bit smarter...
	{
		spawn = p->mo->Pos();
		SpawnAngle = p->mo->Angles.Yaw;
	}
	else
	{
		spawn.X = mthing->pos.X;
		spawn.Y = mthing->pos.Y;

		// Allow full angular precision
		SpawnAngle = DAngle::fromDeg(mthing->angle);
		if (i_compatflags2 & COMPATF2_BADANGLES)
		{
			SpawnAngle += DAngle::fromDeg(0.01);
		}

		if (GetDefaultByType(p->cls)->flags & MF_SPAWNCEILING)
			spawn.Z = ONCEILINGZ;
		else if (GetDefaultByType(p->cls)->flags2 & MF2_SPAWNFLOAT)
			spawn.Z = FLOATRANDZ;
		else
			spawn.Z = ONFLOORZ;
	}

	mobj = Spawn (this, p->cls, spawn, NO_REPLACE);

	if (this->flags & LEVEL_USEPLAYERSTARTZ)
	{
		if (spawn.Z == ONFLOORZ)
			mobj->AddZ(mthing->pos.Z);
		else if (spawn.Z == ONCEILINGZ)
			mobj->AddZ(-mthing->pos.Z);
		P_FindFloorCeiling(mobj, FFCF_SAMESECTOR | FFCF_ONLY3DFLOORS | FFCF_3DRESTRICT);
	}

	mobj->FriendPlayer = playernum + 1;	// [RH] players are their own friends
	oldactor = p->mo;
	p->mo = mobj;
	mobj->player = p;
	state = p->playerstate;
	if (state == PST_REBORN || state == PST_ENTER)
	{
		PlayerReborn (playernum);
	}
	else if (oldactor != NULL && oldactor->player == p && !(flags & SPF_TEMPPLAYER))
	{
		// Move the voodoo doll's inventory to the new player.
		IFVM(Actor, ObtainInventory)
		{
			VMValue params[] = { mobj, oldactor };
			VMCall(func, params, 2, nullptr, 0);
		}
		Behaviors.StopMyScripts (oldactor);	// cancel all ENTER/RESPAWN scripts for the voodoo doll
	}

	// [GRB] Reset skin
	p->userinfo.SkinNumChanged(R_FindSkin (Skins[p->userinfo.GetSkin()].Name.GetChars(), p->CurrentPlayerClass));

	if (!(mobj->flags2 & MF2_DONTTRANSLATE))
	{
		// [RH] Be sure the player has the right translation
		R_BuildPlayerTranslation (playernum);

		// [RH] set color translations for player sprites
		mobj->Translation = TRANSLATION(TRANSLATION_Players,playernum);
	}

	mobj->Angles.Yaw = SpawnAngle;
	mobj->Angles.Pitch = mobj->Angles.Roll = nullAngle;
	mobj->health = p->health;

	// [RH] Set player sprite based on skin
	if (!(mobj->flags4 & MF4_NOSKIN))
	{
		mobj->sprite = Skins[p->userinfo.GetSkin()].sprite;
	}

	p->DesiredFOV = p->FOV = fov;
	p->camera = p->mo;
	p->playerstate = PST_LIVE;
	p->refire = 0;
	p->damagecount = 0;
	p->bonuscount = 0;
	p->morphTics = 0;
	p->MorphedPlayerClass = 0;
	p->MorphStyle = 0;
	p->MorphExitFlash = NULL;
	p->extralight = 0;
	p->fixedcolormap = NOFIXEDCOLORMAP;
	p->fixedlightlevel = -1;
	p->viewheight = p->DefaultViewHeight();
	p->inconsistant = 0;
	p->attacker = nullptr;
	p->spreecount = 0;
	p->multicount = 0;
	p->lastkilltime = 0;
	p->BlendR = p->BlendG = p->BlendB = p->BlendA = 0.f;
	p->Uncrouch();
	p->MinPitch = p->MaxPitch = nullAngle;	// will be filled in by PostBeginPlay()/netcode
	p->MUSINFOactor = nullptr;
	p->MUSINFOtics = -1;
	p->Vel.Zero();	// killough 10/98: initialize bobbing to 0.

	IFVIRTUALPTRNAME(p->mo, NAME_PlayerPawn, ResetAirSupply)
	{
		VMValue params[] = { p->mo, false };
		VMCall(func, params, 2, nullptr, 0);
	}

	for (int ii = 0; ii < MAXPLAYERS; ++ii)
	{
		if (PlayerInGame(ii) && Players[ii]->camera == oldactor)
		{
			Players[ii]->camera = mobj;
		}
	}

	// [RH] Allow chasecam for demo watching
	if ((demoplayback || demonew) && chasedemo)
		p->cheats = CF_CHASECAM;

	// setup gun psprite
	if (!(flags & SPF_TEMPPLAYER))
	{ // This can also start a script so don't do it for the dummy player.
		P_SetupPsprites (p, !!(flags & SPF_WEAPONFULLYUP));
	}

	if (deathmatch)
	{ // Give all cards in death match mode.
		IFVIRTUALPTRNAME(p->mo, NAME_PlayerPawn, GiveDeathmatchInventory)
		{
			VMValue params[1] = { p->mo };
			VMCall(func, params, 1, nullptr, 0);
		}
	}
	else if ((multiplayer || (flags2 & LEVEL2_ALLOWRESPAWN) || sv_singleplayerrespawn ||
		!!G_SkillProperty(SKILLP_PlayerRespawn)) && state == PST_REBORN && oldactor != NULL)
	{ // Special inventory handling for respawning in coop
		IFVM(PlayerPawn, FilterCoopRespawnInventory)
		{
			VMValue params[] = { p->mo, oldactor };
			VMCall(func, params, 2, nullptr, 0);
		}
	}
	if (oldactor != NULL)
	{ // Remove any inventory left from the old actor. Coop handles
	  // it above, but the other modes don't.
		DestroyAllInventory(oldactor);
	}
	// [BC] Handle temporary invulnerability when respawned
	if (state == PST_REBORN || state == PST_ENTER)
	{
		IFVIRTUALPTRNAME(p->mo, NAME_PlayerPawn, OnRespawn)
		{
			VMValue param = p->mo;
			VMCall(func, &param, 1, nullptr, 0);
		}
	}

	if (StatusBar != NULL && (playernum == consoleplayer || StatusBar->GetPlayer() == playernum))
	{
		StatusBar->AttachToPlayer (p);
	}

	if (multiplayer)
	{
		P_SpawnTeleportFog(mobj, mobj->Vec3Angle(20., mobj->Angles.Yaw, 0.), false, true);
	}

	// "Fix" for one of the starts on exec.wad MAP01: If you start inside the ceiling,
	// drop down below it, even if that means sinking into the floor.
	if (mobj->Top() > mobj->ceilingz)
	{
		mobj->SetZ(mobj->ceilingz - mobj->Height, false);
	}

	// [BC] Do script stuff
	if (!(flags & SPF_TEMPPLAYER))
	{
		if (state == PST_ENTER || (state == PST_LIVE && !savegamerestore))
		{
			Behaviors.StartTypedScripts (SCRIPT_Enter, p->mo, true);
			localEventManager->PlayerSpawned(PlayerNum(p));
		}
		else if (state == PST_REBORN)
		{
			assert (oldactor != NULL);

			// before relocating all pointers to the player all sound targets
			// pointing to the old actor have to be NULLed. Otherwise all
			// monsters who last targeted this player will wake up immediately
			// after the player has respawned.
			AActor *th;
			auto it = GetThinkerIterator<AActor>();
			while ((th = it.Next()))
			{
				if (th->LastHeard == oldactor) th->LastHeard = nullptr;
			}
			for(auto &sec : sectors)
			{
				if (sec.SoundTarget == oldactor) sec.SoundTarget = nullptr;
			}

			StaticPointerSubstitution (oldactor, p->mo);

			localEventManager->PlayerRespawned(PlayerNum(p));
			Behaviors.StartTypedScripts (SCRIPT_Respawn, p->mo, true);
		}
	}
	return mobj;
}

//
// P_SpawnMapThing
// The fields of the mapthing should
// already be in host byte order.
//
// [RH] position is used to weed out unwanted start spots
AActor *FLevelLocals::SpawnMapThing (FMapThing *mthing, int position)
{
	PClassActor *i;
	int mask;
	AActor *mobj;

	bool spawnmulti = G_SkillProperty(SKILLP_SpawnMulti) || !!(dmflags2 & DF2_ALWAYS_SPAWN_MULTI);

	if (mthing->EdNum == 0 || mthing->EdNum == -1)
		return NULL;

	// find which type to spawn
	FDoomEdEntry *mentry = mthing->info;

	if (mentry == NULL)
	{
		// [RH] Don't die if the map tries to spawn an unknown thing
		Printf("Unknown type %i at (%.1f, %.1f)\n",
			mthing->EdNum, mthing->pos.X, mthing->pos.Y);
		mentry = DoomEdMap.CheckKey(0);
		if (mentry == NULL)	// we need a valid entry for the rest of this function so if we can't find a default, let's exit right away.
		{
		return NULL;
	}
	}
	if (mentry->Type == NULL && mentry->Special <= 0)
	{
		// has been explicitly set to not spawning anything.
		return NULL;
	}

	// copy args to mapthing so that we have them in one place for the rest of this function	
	if (mentry->ArgsDefined > 0)
	{
		if (mentry->Type!= NULL) mthing->special = mentry->Special;
		memcpy(mthing->args, mentry->Args, sizeof(mthing->args[0]) * mentry->ArgsDefined);
	}

	int pnum = -1;
	if (mentry->Type == NULL)
	{

		switch (mentry->Special)
		{
		case SMT_DeathmatchStart:
		{
			// count deathmatch start positions
			FPlayerStart start(mthing, 0);
			deathmatchstarts.Push(start);
			return NULL;
		}

		case SMT_PolyAnchor:
		case SMT_PolySpawn:
		case SMT_PolySpawnCrush:
		case SMT_PolySpawnHurt:
			return nullptr;

		case SMT_Player1Start:
		case SMT_Player2Start:
		case SMT_Player3Start:
		case SMT_Player4Start:
		case SMT_Player5Start:
		case SMT_Player6Start:
		case SMT_Player7Start:
		case SMT_Player8Start:
			pnum = mentry->Special - SMT_Player1Start;
			break;

		// Sound sequence override will be handled later
		default:
			break;

	}
		}

	if (pnum == -1 || (flags & LEVEL_FILTERSTARTS))
	{
		// check for appropriate game type
		if (deathmatch) 
		{
			mask = MTF_DEATHMATCH;
		}
		else if (multiplayer)
		{
			mask = MTF_COOPERATIVE;
		}
		else if (spawnmulti)
		{
			mask = MTF_COOPERATIVE|MTF_SINGLE;
		}
		else
		{
			mask = MTF_SINGLE;
		}
		if (!(mthing->flags & mask))
		{
			return NULL;
		}

		mask = G_SkillProperty(SKILLP_SpawnFilter);
		if (!(mthing->SkillFilter & mask) && !mentry->NoSkillFlags)
		{
			return NULL;
		}

		// Check class spawn masks. Now with player classes available
		// this is enabled for all games.
		if (!multiplayer)
		{ // Single player
			auto p = GetConsolePlayer();
			if (p)
			{
				int spawnmask = p->GetSpawnClass();
				if (spawnmask != 0 && (mthing->ClassFilter & spawnmask) == 0)
				{ // Not for current class
					return nullptr;
				}
			}
		}
		else if (!deathmatch)
		{ // Cooperative
			mask = 0;
			for (int i = 0; i < MAXPLAYERS; i++)
			{
				if (PlayerInGame(i))
				{
					int spawnmask = Players[i]->GetSpawnClass();
					if (spawnmask != 0)
						mask |= spawnmask;
					else 
						mask = -1;
				}
			}
			if (mask != -1 && (mthing->ClassFilter & mask) == 0)
			{
				return NULL;
			}
		}
	}

	if (pnum != -1)
	{
		// [RH] Only spawn spots that match position.
		if (mthing->args[0] != position)
			return NULL;

		// save spots for respawning in network games
		FPlayerStart start(mthing, pnum+1);
		playerstarts[pnum] = start;
		if (flags2 & LEVEL2_RANDOMPLAYERSTARTS)
		{ // When using random player starts, all starts count
			AllPlayerStarts.Push(start);
		}
		else
		{ // When not using random player starts, later single player
		  // starts should override earlier ones, since the earlier
		  // ones are for voodoo dolls and not likely to be ideal for
		  // spawning regular players.
			unsigned i;
			for (i = 0; i < AllPlayerStarts.Size(); ++i)
			{
				if (AllPlayerStarts[i].type == pnum+1)
				{
					AllPlayerStarts[i] = start;
					break;
				}
			}
			if (i == AllPlayerStarts.Size())
			{
				AllPlayerStarts.Push(start);
			}
		}
		if (!deathmatch && !(flags2 & LEVEL2_RANDOMPLAYERSTARTS))
		{
			return SpawnPlayer(&start, pnum, (flags2 & LEVEL2_PRERAISEWEAPON) ? SPF_WEAPONFULLYUP : 0);
		}
		return NULL;
	}

	// [RH] sound sequence overriders
	if (mentry->Type == NULL && mentry->Special == SMT_SSeqOverride)
	{
		int type = mthing->args[0];
		if (type == 255) type = -1;
		if (type > 63)
		{
			Printf ("Sound sequence %d out of range\n", type);
		}
		else
		{
			PointInSector (mthing->pos)->seqType = type;
		}
		return NULL;
	}

	// [RH] If the thing's corresponding sprite has no frames, also map
	//		it to the unknown thing.
		// Handle decorate replacements explicitly here
		// to check for missing frames in the replacement object.
	i = mentry->Type->GetReplacement(this);

		const AActor *defaults = GetDefaultByType (i);
		if (defaults->SpawnState == NULL ||
			sprites[defaults->SpawnState->sprite].numframes == 0)
		{
			// We don't load mods for shareware games so we'll just ignore
			// missing actors. Heretic needs this since the shareware includes
			// the retail weapons in Deathmatch.
			if (gameinfo.flags & GI_SHAREWARE)
				return NULL;

			Printf ("%s at (%.1f, %.1f) has no frames\n",
					i->TypeName.GetChars(), mthing->pos.X, mthing->pos.Y);
			i = PClass::FindActor("Unknown");
			assert(i->IsDescendantOf(RUNTIME_CLASS(AActor)));
		}

	const AActor *info = GetDefaultByType (i);

	// Don't spawn keycards and players in deathmatch.
	if (deathmatch && (info->flags & MF_NOTDMATCH))
		return nullptr;

	// Don't spawn extra things in co-op if desired.
	if (multiplayer && !deathmatch)
	{
		// Don't spawn DM-only things in co-op.
		if ((dmflags2 & DF2_NO_COOP_THING_SPAWN) && (mthing->flags & (MTF_DEATHMATCH|MTF_SINGLE)) == MTF_DEATHMATCH)
			return nullptr;
		// Having co-op only functionality is a bit odd, but you never know.
		if (!mthing->special && !mthing->thingid && (mthing->flags & (MTF_COOPERATIVE | MTF_SINGLE)) == MTF_COOPERATIVE)
		{
			// Don't spawn co-op only things in general.
			if (dmflags3 & DF3_NO_COOP_ONLY_THINGS)
				return nullptr;
			// Don't spawn co-op only items.
			if ((dmflags3 & DF3_NO_COOP_ONLY_ITEMS) && i->IsDescendantOf(NAME_Inventory))
				return nullptr;
		}
	}

	// [RH] don't spawn extra weapons in coop if so desired
	if (multiplayer && !deathmatch && (dmflags & DF_NO_COOP_WEAPON_SPAWN))
	{
		if (GetDefaultByType(i)->flags7 & MF7_WEAPONSPAWN)
		{
			if ((mthing->flags & (MTF_DEATHMATCH|MTF_SINGLE)) == MTF_DEATHMATCH)
				return NULL;
		}
	}

	// don't spawn any monsters if -nomonsters
	if (((flags2 & LEVEL2_NOMONSTERS) || (dmflags & DF_NO_MONSTERS)) && info->flags3 & MF3_ISMONSTER )
	{
		return NULL;
	}
	auto it = GetDefaultByType(i);

	IFVIRTUALPTR(it, AActor, ShouldSpawn)
	{
		int ret;
		VMValue param = it;
		VMReturn rett(&ret);
		VMCall(func, &param, 1, &rett, 1);
		if (!ret) return nullptr;
	}

	// spawn it
	double sz;

	if (info->flags & MF_SPAWNCEILING)
		sz = ONCEILINGZ;
	else if (info->flags2 & MF2_SPAWNFLOAT)
		sz = FLOATRANDZ;
	else
		sz = ONFLOORZ;

	mobj = AActor::StaticSpawn (this, i, DVector3(mthing->pos.XY(), sz), NO_REPLACE, true);

	if (sz == ONFLOORZ)
	{
		mobj->AddZ(mthing->pos.Z);
		if ((mobj->flags2 & MF2_FLOATBOB) && (mobj->Level->ib_compatflags & BCOMPATF_FLOATBOB))
		{
			mobj->specialf1 = mthing->pos.Z;
		}
	}
	else if (sz == ONCEILINGZ)
		mobj->AddZ(-mthing->pos.Z);

	if (mobj->flags2 & MF2_FLOORCLIP)
	{
		mobj->AdjustFloorClip();
	}

	mobj->SpawnPoint = mthing->pos;
	mobj->SpawnAngle = mthing->angle;
	mobj->SpawnFlags = mthing->flags;
	if (mthing->friendlyseeblocks > 0)
		mobj->friendlyseeblocks = mthing->friendlyseeblocks;
	if (mthing->FloatbobPhase >= 0 && mthing->FloatbobPhase < 64) mobj->FloatBobPhase = mthing->FloatbobPhase;
	if (mthing->Gravity < 0) mobj->Gravity = -mthing->Gravity;
	else if (mthing->Gravity > 0) mobj->Gravity *= mthing->Gravity;
	else 
	{
		mobj->flags |= MF_NOGRAVITY;
		mobj->Gravity = 0;
	}

	// For Hexen floatbob 'compatibility' we do not really want to alter the floorz.
	if (mobj->specialf1 == 0 || !(mobj->flags2 & MF2_FLOATBOB) || !(mobj->Level->ib_compatflags & BCOMPATF_FLOATBOB))
	{
		P_FindFloorCeiling(mobj, FFCF_SAMESECTOR | FFCF_ONLY3DFLOORS | FFCF_3DRESTRICT);
	}

	// if the actor got args defined either in DECORATE or MAPINFO we must ignore the map's properties.
	if (!(mobj->flags2 & MF2_ARGSDEFINED))
	{
		// [RH] Set the thing's special
		mobj->special = mthing->special;
		for(int j=0;j<5;j++) mobj->args[j]=mthing->args[j];
	}

	// [RH] Add ThingID to mobj and link it in with the others
	mobj->SetTID(mthing->thingid);

	mobj->PrevAngles.Yaw = mobj->Angles.Yaw = DAngle::fromDeg(mthing->angle);

	// Check if this actor's mapthing has a conversation defined
	if (mthing->Conversation > 0)
	{
		// Make sure that this does not partially overwrite the default dialogue settings.
		int root = GetConversation(mthing->Conversation);
		if (root != -1)
		{
			mobj->ConversationRoot = root;
			mobj->Conversation = StrifeDialogues[mobj->ConversationRoot];
		}
	}

	// Set various UDMF options
	if (mthing->Alpha >= 0)
		mobj->Alpha = mthing->Alpha;
	if (mthing->RenderStyle != STYLE_Count)
		mobj->RenderStyle = (ERenderStyle)mthing->RenderStyle;
	if (mthing->Scale.X != 0)
		mobj->Scale.X = mthing->Scale.X * mobj->Scale.X;
	if (mthing->Scale.Y != 0)
		mobj->Scale.Y = mthing->Scale.Y * mobj->Scale.Y;
	if (mthing->pitch)
		mobj->Angles.Pitch = DAngle::fromDeg(mthing->pitch);
	if (mthing->roll)
		mobj->Angles.Roll = DAngle::fromDeg(mthing->roll);
	if (mthing->score)
		mobj->Score = mthing->score;
	if (mthing->fillcolor)
		mobj->fillcolor = (mthing->fillcolor & 0xffffff) | (ColorMatcher.Pick((mthing->fillcolor & 0xff0000) >> 16,
			(mthing->fillcolor & 0xff00) >> 8, (mthing->fillcolor & 0xff)) << 24);

	// allow color strings for lights and reshuffle the args for spot lights
	if (i->IsDescendantOf(NAME_DynamicLight))
	{
		if (mthing->arg0str != NAME_None)
		{
			PalEntry color = V_GetColor(mthing->arg0str.GetChars());
			mobj->args[0] = color.r;
			mobj->args[1] = color.g;
			mobj->args[2] = color.b;
		}
		else if (mobj->IntVar(NAME_lightflags) & LF_SPOT)
		{
			mobj->args[0] = RPART(mthing->args[0]);
			mobj->args[1] = GPART(mthing->args[0]);
			mobj->args[2] = BPART(mthing->args[0]);
		}

		if (mobj->IntVar(NAME_lightflags) & LF_SPOT)
		{
			mobj->AngleVar(NAME_SpotInnerAngle) = DAngle::fromDeg(mthing->args[1]);
			mobj->AngleVar(NAME_SpotOuterAngle) = DAngle::fromDeg(mthing->args[2]);
		}
	}

	mobj->CallBeginPlay ();
	if (!(mobj->ObjectFlags & OF_EuthanizeMe))
	{
		mobj->LevelSpawned ();
	}

	if (mthing->Health > 0)
		mobj->health = int(mobj->health * mthing->Health);
	else
		mobj->health = -int(mthing->Health);
	if (mthing->Health == 0)
	{
		// We cannot call 'Die' here directly because the level is not yet fully set up.
		// This needs to be delayed by one tic.
		auto state = mobj->FindState(NAME_DieFromSpawn);
		if (state) mobj->SetState(state, true);
	}
	else if (mthing->Health != 1)
		mobj->StartHealth = mobj->health;

	return mobj;
}

//===========================================================================
//
// SpawnMapThing
//
//===========================================================================
CVAR(Bool, dumpspawnedthings, false, 0)

AActor *FLevelLocals::SpawnMapThing(int index, FMapThing *mt, int position)
{
	AActor *spawned = SpawnMapThing(mt, position);
	if (dumpspawnedthings)
	{
		Printf("%5d: (%5f, %5f, %5f), doomednum = %5d, flags = %04x, type = %s\n",
			index, mt->pos.X, mt->pos.Y, mt->pos.Z, mt->EdNum, mt->flags,
			spawned ? spawned->GetClass()->TypeName.GetChars() : "(none)");
	}
	T_AddSpawnedThing(this, spawned);
	return spawned;
}



//
// GAME SPAWN FUNCTIONS
//


//
// P_SpawnPuff
//

AActor *P_SpawnPuff (AActor *source, PClassActor *pufftype, const DVector3 &pos1, DAngle hitdir, DAngle particledir, int updown, int flags, AActor *vict)
{
	AActor *puff;
	DVector3 pos = pos1;

	if (pufftype == nullptr) return nullptr;

	if (!(flags & PF_NORANDOMZ)) pos.Z += pr_spawnpuff.Random2() / 64.;
	puff = Spawn(source->Level, pufftype, pos, ALLOW_REPLACE);
	if (puff == NULL) return NULL;

	if ((puff->flags4 & MF4_RANDOMIZE) && puff->tics > 0)
	{
		puff->tics -= pr_spawnpuff() & 3;
		if (puff->tics < 1)
			puff->tics = 1;
	}

	//Moved puff creation and target/master/tracer setting to here. 
	if (puff && vict)
	{
		if (puff->flags7 & MF7_HITTARGET)	puff->target = vict;
		if (puff->flags7 & MF7_HITMASTER)	puff->master = vict;
		if (puff->flags7 & MF7_HITTRACER)	puff->tracer = vict;
	}
	// [BB] If the puff came from a player, set the target of the puff to this player.
	if ( puff && (puff->flags5 & MF5_PUFFGETSOWNER))
		puff->target = source;
	
	// Angle is the opposite of the hit direction (i.e. the puff faces the source.)
	puff->Angles.Yaw = hitdir + DAngle::fromDeg(180);

	// If a puff has a crash state and an actor was not hit,
	// it will enter the crash state. This is used by the StrifeSpark
	// and BlasterPuff.
	FState *crashstate;
	if ((flags & PF_HITSKY) && (crashstate = puff->FindState(NAME_Death, NAME_Sky, true)) != NULL)
	{
		puff->SetState (crashstate);
	}
	else if (!(flags & PF_HITTHING) && (crashstate = puff->FindState(NAME_Crash)) != NULL)
	{
		puff->SetState (crashstate);
	}
	else if ((flags & PF_HITTHINGBLEED) && (crashstate = puff->FindState(NAME_Death, NAME_Extreme, true)) != NULL)
	{
		puff->SetState (crashstate);
	}
	else if ((flags & PF_MELEERANGE) && puff->MeleeState != NULL)
	{
		// handle the hard coded state jump of Doom's bullet puff
		// in a more flexible manner.
		puff->SetState (puff->MeleeState);
	}

	if (!(flags & PF_TEMPORARY))
	{
		if (cl_pufftype && updown != 3 && (puff->flags4 & MF4_ALLOWPARTICLES))
		{
			P_DrawSplash2 (source->Level, 32, pos, particledir, updown, 1);
			if (cl_pufftype == 1) puff->renderflags |= RF_INVISIBLE;
		}

		if ((flags & PF_HITTHING) && puff->SeeSound.isvalid())
		{ // Hit thing sound
			S_Sound (puff, CHAN_BODY, 0, puff->SeeSound, 1, ATTN_NORM);
		}
		else if (puff->AttackSound.isvalid())
		{
			S_Sound (puff, CHAN_BODY, 0, puff->AttackSound, 1, ATTN_NORM);
		}
	}

	return puff;
}

DEFINE_ACTION_FUNCTION(AActor, SpawnPuff)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_CLASS(pufftype, AActor);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_ANGLE(hitdir);
	PARAM_ANGLE(particledir);
	PARAM_INT(updown);
	PARAM_INT(flags);
	PARAM_OBJECT(victim, AActor);
	ACTION_RETURN_OBJECT(P_SpawnPuff(self, pufftype, DVector3(x, y, z), hitdir, particledir, updown, flags, victim));
}

//---------------------------------------------------------------------------
//
// P_SpawnBlood
// 
//---------------------------------------------------------------------------

void P_SpawnBlood (const DVector3 &pos1, DAngle dir, int damage, AActor *originator)
{
	AActor *th;
	PClassActor *bloodcls = originator->GetBloodType();
	DVector3 pos = pos1;
	pos.Z += pr_spawnblood.Random2() / 64.;

	int bloodtype = cl_bloodtype;
	
	if (bloodcls != NULL && !(GetDefaultByType(bloodcls)->flags4 & MF4_ALLOWPARTICLES))
		bloodtype = 0;

	if (bloodcls != NULL)
	{
		th = Spawn(originator->Level, bloodcls, pos, NO_REPLACE); // GetBloodType already performed the replacement
		th->Vel.Z = 2;
		th->Angles.Yaw = dir;
		// [NG] Applying PUFFGETSOWNER to the blood will make it target the owner
		if (th->flags5 & MF5_PUFFGETSOWNER) th->target = originator;
		if (gameinfo.gametype & GAME_DoomChex)
		{
			th->tics -= pr_spawnblood() & 3;

			if (th->tics < 1)
				th->tics = 1;
		}
		// colorize the blood
		if (!(th->flags2 & MF2_DONTTRANSLATE))
		{
			th->Translation = originator->BloodTranslation;
		}
		
		// Moved out of the blood actor so that replacing blood is easier
		if (gameinfo.gametype & GAME_DoomStrifeChex)
		{
			if (gameinfo.gametype == GAME_Strife)
			{
				if (damage > 13)
				{
					FState *state = th->FindState(NAME_Spray);
					if (state != NULL)
					{
						th->SetState (state);
						goto statedone;
					}
				}
				else damage += 2;
			}
			int advance = 0;
			if (damage <= 12 && damage >= 9)
			{
				advance = 1;
			}
			else if (damage < 9)
			{
				advance = 2;
			}

			PClassActor *cls = th->GetClass();

			while (cls != RUNTIME_CLASS(AActor))
			{
				int checked_advance = advance;
				if (cls->OwnsState(th->SpawnState))
				{
					for (; checked_advance > 0; --checked_advance)
					{
						// [RH] Do not set to a state we do not own.
						if (cls->OwnsState(th->SpawnState + checked_advance))
						{
							th->SetState(th->SpawnState + checked_advance);
							goto statedone;
						}
					}
				}
				// We can safely assume the ParentClass is of type PClassActor
				// since we stop when we see the Actor base class.
				cls = static_cast<PClassActor *>(cls->ParentClass);
			}
		}

	statedone:
		if (!(bloodtype <= 1)) th->renderflags |= RF_INVISIBLE;
	}

	if (bloodtype >= 1)
		P_DrawSplash2 (originator->Level, 40, pos, dir, 2, originator->BloodColor);
}

DEFINE_ACTION_FUNCTION(AActor, SpawnBlood)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_ANGLE(dir);
	PARAM_INT(damage);
	P_SpawnBlood(DVector3(x, y, z), dir, damage, self);
	return 0;
}


//---------------------------------------------------------------------------
//
// PROC P_BloodSplatter
//
//---------------------------------------------------------------------------

void P_BloodSplatter (const DVector3 &pos, AActor *originator, DAngle hitangle)
{
	PClassActor *bloodcls = originator->GetBloodType(1); 

	int bloodtype = cl_bloodtype;
	
	if (bloodcls != NULL && !(GetDefaultByType(bloodcls)->flags4 & MF4_ALLOWPARTICLES))
		bloodtype = 0;

	if (bloodcls != NULL)
	{
		AActor *mo;

		mo = Spawn(originator->Level, bloodcls, pos, NO_REPLACE); // GetBloodType already performed the replacement
		mo->target = originator;
		mo->Vel.X = pr_splatter.Random2 () / 64.;
		mo->Vel.Y = pr_splatter.Random2() / 64.;
		mo->Vel.Z = 3;

		// colorize the blood!
		if (!(mo->flags2 & MF2_DONTTRANSLATE)) 
		{
			mo->Translation = originator->BloodTranslation;
		}

		if (!(bloodtype <= 1)) mo->renderflags |= RF_INVISIBLE;
	}
	if (bloodtype >= 1)
	{
		P_DrawSplash2 (originator->Level, 40, pos, hitangle - DAngle::fromDeg(180.), 2, originator->BloodColor);
	}
}

//===========================================================================
//
//  P_BloodSplatter2
//
//===========================================================================

void P_BloodSplatter2 (const DVector3 &pos, AActor *originator, DAngle hitangle)
{
	PClassActor *bloodcls = originator->GetBloodType(2);

	int bloodtype = cl_bloodtype;
	
	if (bloodcls != NULL && !(GetDefaultByType(bloodcls)->flags4 & MF4_ALLOWPARTICLES))
		bloodtype = 0;

	DVector2 add;
	add.X = (pr_splat() - 128) / 32.;
	add.Y = (pr_splat() - 128) / 32.;

	if (bloodcls != NULL)
	{
		AActor *mo;


		mo = Spawn (originator->Level, bloodcls, pos + add, NO_REPLACE); // GetBloodType already performed the replacement
		mo->target = originator;

		// colorize the blood!
		if (!(mo->flags2 & MF2_DONTTRANSLATE))
		{
			mo->Translation = originator->BloodTranslation;
		}

		if (!(bloodtype <= 1)) mo->renderflags |= RF_INVISIBLE;
	}
	if (bloodtype >= 1)
	{
		P_DrawSplash2(originator->Level, 40, pos + add, hitangle - DAngle::fromDeg(180.), 2, originator->BloodColor);
	}
}

DEFINE_ACTION_FUNCTION(AActor, BloodSplatter)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_ANGLE(dir);
	PARAM_BOOL(axe);
	if (axe) P_BloodSplatter2(DVector3(x, y, z), self, dir);
	else P_BloodSplatter(DVector3(x, y, z), self, dir);
	return 0;
}


//---------------------------------------------------------------------------
//
// PROC P_RipperBlood
//
//---------------------------------------------------------------------------

void P_RipperBlood (AActor *mo, AActor *bleeder)
{
	PClassActor *bloodcls = bleeder->GetBloodType();

	double xo = pr_ripperblood.Random2() / 16.;
	double yo = pr_ripperblood.Random2() / 16.;
	double zo = pr_ripperblood.Random2() / 16.;
	DVector3 pos = mo->Vec3Offset(xo, yo, zo);

	int bloodtype = cl_bloodtype;
	
	if (bloodcls != NULL && !(GetDefaultByType(bloodcls)->flags4 & MF4_ALLOWPARTICLES))
		bloodtype = 0;

	if (bloodcls != NULL)
	{
		AActor *th;
		th = Spawn (bleeder->Level, bloodcls, pos, NO_REPLACE); // GetBloodType already performed the replacement
		// [NG] Applying PUFFGETSOWNER to the blood will make it target the owner
		if (th->flags5 & MF5_PUFFGETSOWNER) th->target = bleeder;
		if (gameinfo.gametype == GAME_Heretic)
			th->flags |= MF_NOGRAVITY;
		th->Vel.X = mo->Vel.X / 2;
		th->Vel.Y = mo->Vel.Y / 2;
		th->tics += pr_ripperblood () & 3;

		// colorize the blood!
		if (!(th->flags2 & MF2_DONTTRANSLATE))
		{
			th->Translation = bleeder->BloodTranslation;
		}

		if (!(bloodtype <= 1)) th->renderflags |= RF_INVISIBLE;
	}
	if (bloodtype >= 1)
	{
		P_DrawSplash2(bleeder->Level, 28, pos, bleeder->AngleTo(mo) + DAngle::fromDeg(180.), 0, bleeder->BloodColor);
	}
}

//---------------------------------------------------------------------------
//
// FUNC P_GetThingFloorType
//
//---------------------------------------------------------------------------

int P_GetThingFloorType (AActor *thing)
{
	if (thing->floorterrain >= 0)
	{		
		return thing->floorterrain;
	}
	else
	{
		return thing->Sector->GetTerrain(sector_t::floor);
	}
}


//---------------------------------------------------------------------------
//
// FUNC P_HitWater
//
// Returns true if hit liquid and splashed, false if not.
//---------------------------------------------------------------------------

bool P_HitWater (AActor * thing, sector_t * sec, const DVector3 &pos, bool checkabove, bool alert, bool force)
{
	if (thing->player && (thing->player->cheats & CF_PREDICTING))
		return false;

	AActor *mo = NULL;
	FSplashDef *splash;
	int terrainnum;
	sector_t *hsec = NULL;
	
	// don't splash above the object
	if (checkabove)
	{
		double compare_z = thing->Center();
		// Missiles are typically small and fast, so they might
		// end up submerged by the move that calls P_HitWater.
		if (thing->flags & MF_MISSILE)
			compare_z -= thing->Vel.Z;
		if (pos.Z > compare_z) 
			return false;
	}

#if 0 // needs some rethinking before activation

	// This avoids spawning splashes on invisible self referencing sectors.
	// For network consistency do this only in single player though because
	// it is not guaranteed that all players have GL nodes loaded.
	if (!multiplayer && thing->subsector->sector != thing->subsector->render_sector)
	{
		double zs = thing->subsector->sector->floorplane.ZatPoint(pos);
		double zr = thing->subsector->render_sector->floorplane.ZatPoint(pos);

		if (zs > zr && thing->Z() >= zs) return false;
	}
#endif

	// 'force' means, we want this sector's terrain, no matter what.
	if (!force)
	{
		for (unsigned int i = 0; i<sec->e->XFloor.ffloors.Size(); i++)
		{
			F3DFloor * rover = sec->e->XFloor.ffloors[i];
			if (!(rover->flags & FF_EXISTS)) continue;
			double planez = rover->top.plane->ZatPoint(pos);
				if (pos.Z > planez - 0.5 && pos.Z < planez + 0.5)	// allow minor imprecisions
			{
				if ((rover->flags & (FF_SOLID | FF_SWIMMABLE)) || rover->alpha > 0)
				{
					terrainnum = rover->model->GetTerrain(rover->top.isceiling);
					goto foundone;
				}
			}
			planez = rover->bottom.plane->ZatPoint(pos);
			if (planez < pos.Z && !(planez < thing->floorz)) return false;
		}
	}
	hsec = sec->GetHeightSec();
	if (force || hsec == NULL || !(hsec->MoreFlags & SECMF_CLIPFAKEPLANES))
	{
		terrainnum = sec->GetTerrain(sector_t::floor);
	}
	else
	{
		terrainnum = hsec->GetTerrain(sector_t::floor);
	}
foundone:

	int splashnum = Terrains[terrainnum].Splash;
	bool smallsplash = false;
	const secplane_t *plane;

	if (splashnum == -1)
		return Terrains[terrainnum].IsLiquid;

	const bool dealDamageOnLand = thing->player
		&& Terrains[terrainnum].DamageOnLand
		&& Terrains[terrainnum].DamageAmount
		&& (thing->Level->time & Terrains[terrainnum].DamageTimeMask);
	if (dealDamageOnLand)
		P_DamageMobj(thing, nullptr, nullptr, Terrains[terrainnum].DamageAmount, Terrains[terrainnum].DamageMOD);

	// don't splash when touching an underwater floor
	if (thing->waterlevel >= 1 && pos.Z <= thing->floorz) return Terrains[terrainnum].IsLiquid;

	plane = hsec != NULL? &sec->heightsec->floorplane : &sec->floorplane;

	// Don't splash for living things with small vertical velocities.
	// There are levels where the constant splashing from the monsters gets extremely annoying
	if (((thing->flags3&MF3_ISMONSTER || thing->player) && thing->Vel.Z >= -6) && !force)
		return Terrains[terrainnum].IsLiquid;

	splash = &Splashes[splashnum];

	// Small splash for small masses
	if (thing->Mass < 10)
		smallsplash = true;

	if (!(thing->flags3 & MF3_DONTSPLASH))
	{
		if (smallsplash && splash->SmallSplash)
		{
			mo = Spawn(sec->Level, splash->SmallSplash, pos, ALLOW_REPLACE);
			mo->target = thing;
			if (mo) mo->Floorclip += splash->SmallSplashClip;
		}
		else
		{
			if (splash->SplashChunk)
			{
				mo = Spawn(sec->Level, splash->SplashChunk, pos, ALLOW_REPLACE);
				mo->target = thing;
				if (splash->ChunkXVelShift != 255)
				{
					mo->Vel.X = (pr_chunk.Random2() << splash->ChunkXVelShift) / 65536.;
				}
				if (splash->ChunkYVelShift != 255)
				{
					mo->Vel.Y = (pr_chunk.Random2() << splash->ChunkYVelShift) / 65536.;
				}
				mo->Vel.Z = splash->ChunkBaseZVel + (pr_chunk() << splash->ChunkZVelShift) / 65536.;
			}
			if (splash->SplashBase)
			{
				mo = Spawn(sec->Level, splash->SplashBase, pos, ALLOW_REPLACE);
				mo->target = thing;
			}
			if (thing->player && !splash->NoAlert && alert)
			{
				P_NoiseAlert(thing, thing, true);
			}
		}
		if (mo)
		{
			S_Sound(mo, CHAN_ITEM, 0, smallsplash ?
				splash->SmallSplashSound : splash->NormalSplashSound,
				1, ATTN_IDLE);
		}
		else
		{
			S_Sound(thing->Level, pos, CHAN_ITEM, 0, smallsplash ?
				splash->SmallSplashSound : splash->NormalSplashSound,
				1, ATTN_IDLE);
		}
	}

	// Don't let deep water eat missiles
	return plane == &sec->floorplane ? Terrains[terrainnum].IsLiquid : false;
}

DEFINE_ACTION_FUNCTION(AActor, HitWater)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_POINTER_NOT_NULL(sec, sector_t);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_BOOL(checkabove);
	PARAM_BOOL(alert);
	PARAM_BOOL(force);
	ACTION_RETURN_BOOL(P_HitWater(self, sec, DVector3(x, y, z), checkabove, alert, force));
}


//---------------------------------------------------------------------------
//
// FUNC P_HitFloor
//
// Returns true if hit liquid and splashed, false if not.
//---------------------------------------------------------------------------

bool P_HitFloor (AActor *thing)
{
	const msecnode_t *m;

	// killough 11/98: touchy objects explode on impact
	// Allow very short drops to be safe, so that a touchy can be summoned without exploding.
	if (thing->flags6 & MF6_TOUCHY && ((thing->flags6 & MF6_ARMED) || thing->IsSentient()) && thing->Vel.Z < -5)
	{
		thing->flags6 &= ~MF6_ARMED; // Disarm
		P_DamageMobj (thing, NULL, NULL, thing->health, NAME_Crush, DMG_FORCED);  // kill object
		return false;
	}

	// don't splash if landing on the edge above water/lava/etc....
	DVector3 pos;
	for (m = thing->touching_sectorlist; m; m = m->m_tnext)
	{
		pos = thing->PosRelative(m->m_sector);
		if (thing->Z() == m->m_sector->floorplane.ZatPoint(pos))
		{
			break;
		}

		// Check 3D floors
		for(unsigned int i=0;i<m->m_sector->e->XFloor.ffloors.Size();i++)
		{		
			F3DFloor * rover = m->m_sector->e->XFloor.ffloors[i];
			if (!(rover->flags & FF_EXISTS)) continue;
			if (rover->flags & (FF_SOLID|FF_SWIMMABLE))
			{
				if (rover->top.plane->ZatPoint(pos) == thing->Z())
				{
					return P_HitWater (thing, m->m_sector, pos);
				}
			}
		}
	}
	if (m == NULL || m->m_sector->GetHeightSec() != NULL)
	{ 
		return false;
	}

	return P_HitWater (thing, m->m_sector, pos);
}

DEFINE_ACTION_FUNCTION(AActor, HitFloor)
{
	PARAM_SELF_PROLOGUE(AActor);
	ACTION_RETURN_BOOL(P_HitFloor(self));
}

//---------------------------------------------------------------------------
//
// FUNC P_CheckMissileSpawn
//
// Returns true if the missile is at a valid spawn point, otherwise
// explodes it and returns false.
//
//---------------------------------------------------------------------------

bool P_CheckMissileSpawn (AActor* th, double maxdist)
{
	// [RH] Don't decrement tics if they are already less than 1
	if ((th->flags4 & MF4_RANDOMIZE) && th->tics > 0)
	{
		th->tics -= pr_checkmissilespawn() & 3;
		if (th->tics < 1)
			th->tics = 1;
	}

	DVector3 newpos = { 0,0,0 };

	if (maxdist > 0)
	{
		// move a little forward so an angle can be computed if it immediately explodes
		DVector3 advance = th->Vel;
		double maxsquared = maxdist*maxdist;

		// Keep halving the advance vector until we get something less than maxdist
		// units away, since we still want to spawn the missile inside the shooter.
		do
		{
			advance *= 0.5f;
		}
		while (advance.XY().LengthSquared() >= maxsquared);
		newpos += advance;
	}

	newpos = th->Vec3Offset(newpos);
	th->SetXYZ(newpos);
	th->Sector = th->Level->PointInSector(th->Pos());

	FCheckPosition tm(!!(th->flags2 & MF2_RIP));

	// killough 8/12/98: for non-missile objects (e.g. grenades)
	// 
	// [GZ] MBF excludes non-missile objects from the P_TryMove test
	// and subsequent potential P_ExplodeMissile call. That is because
	// in MBF, a projectile is not an actor with the MF_MISSILE flag
	// but an actor with either or both the MF_MISSILE and MF_BOUNCES
	// flags, and a grenade is identified by not having MF_MISSILE.
	// Killough wanted grenades not to explode directly when spawned,
	// therefore they can be fired safely even when humping a wall as
	// they will then just drop on the floor at their shooter's feet.
	//
	// However, ZDoom does allow non-missiles to be shot as well, so
	// Killough's check for non-missiles is inadequate here. So let's
	// replace it by a check for non-missile and MBF bounce type.
	// This should allow MBF behavior where relevant without altering
	// established ZDoom behavior for crazy stuff like a cacodemon cannon.
	bool MBFGrenade = (!(th->flags & MF_MISSILE) || (th->BounceFlags & BOUNCE_MBF));

	// killough 3/15/98: no dropoff (really = don't care for missiles)
	auto oldf2 = th->flags2;
	th->flags2 &= ~(MF2_MCROSS|MF2_PCROSS);	// The following check is not supposed to activate missile triggers.
	if (!(P_TryMove (th, newpos.XY(), false, NULL, tm, true)))
	{
		// [RH] Don't explode ripping missiles that spawn inside something
		if (th->BlockingMobj == NULL || !(th->flags2 & MF2_RIP) || (th->BlockingMobj->flags5 & MF5_DONTRIP))
		{
			// If this is a monster spawned by A_SpawnProjectile subtract it from the counter.
			th->ClearCounters();
			// [RH] Don't explode missiles that spawn on top of horizon lines
			if (th->BlockingLine != NULL && th->BlockingLine->special == Line_Horizon)
			{
				th->Destroy ();
			}
			else if (MBFGrenade && th->BlockingLine != NULL)
			{
				P_BounceWall(th);
			}
			else
			{
				P_ExplodeMissile (th, th->BlockingLine, th->BlockingMobj);
			}
			return false;
		}
	}
	th->flags2 = oldf2;
	th->ClearInterpolation();
	return true;
}

DEFINE_ACTION_FUNCTION(AActor, CheckMissileSpawn)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(add);
	ACTION_RETURN_BOOL(P_CheckMissileSpawn(self, add));
}


//---------------------------------------------------------------------------
//
// FUNC P_PlaySpawnSound
//
// Plays a missiles spawn sound. Location depends on the
// MF_SPAWNSOUNDSOURCE flag.
//
//---------------------------------------------------------------------------

void P_PlaySpawnSound(AActor *missile, AActor *spawner)
{
	if (missile->SeeSound != NO_SOUND)
	{
		if (!(missile->flags & MF_SPAWNSOUNDSOURCE))
		{
			S_Sound (missile, CHAN_VOICE, 0, missile->SeeSound, 1, ATTN_NORM);
		}
		else if (spawner != NULL)
		{
			S_Sound (spawner, CHAN_WEAPON, 0, missile->SeeSound, 1, ATTN_NORM);
		}
		else
		{
			// If there is no spawner use the spawn position.
			// But not in a silenced sector.
			if (!(missile->Sector->Flags & SECF_SILENT))
				S_Sound (missile->Level, missile->Pos(), CHAN_WEAPON, 0, missile->SeeSound, 1, ATTN_NORM);
		}
	}
}

DEFINE_ACTION_FUNCTION(AActor, PlaySpawnSound)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT_NOT_NULL(missile, AActor);
	P_PlaySpawnSound(missile, self);
	return 0;
}



double GetDefaultSpeed(PClassActor *type)
{
	if (type == NULL)
		return 0;

	auto def = GetDefaultByType(type);
	if (G_SkillProperty(SKILLP_FastMonsters))
	{
		double f = def->FloatVar(NAME_FastSpeed);
		if (f >= 0) return f;
	}
	return def->Speed;
}

//---------------------------------------------------------------------------
//
// FUNC P_SpawnMissile
//
// Returns NULL if the missile exploded immediately, otherwise returns
// a mobj_t pointer to the missile.
//
//---------------------------------------------------------------------------

AActor *P_SpawnMissileXYZ (DVector3 pos, AActor *source, AActor *dest, PClassActor *type, bool checkspawn, AActor *owner)
{
	if (source == nullptr || type == nullptr)
	{
		return nullptr;
	}

	if (dest == NULL)
	{
		Printf ("P_SpawnMissileXYZ: Tried to shoot %s from %s with no destination\n",
			type->TypeName.GetChars(), source->GetClass()->TypeName.GetChars());
		return NULL;
	}

	if (pos.Z != ONFLOORZ && pos.Z != ONCEILINGZ)
	{
		pos.Z -= source->Floorclip;
	}

	AActor *th = Spawn (source->Level, type, pos, ALLOW_REPLACE);
	
	P_PlaySpawnSound(th, source);

	// record missile's originator
	if (owner == NULL) owner = source;
	th->target = owner;

	double speed = th->Speed;

	// [RH]
	// Hexen calculates the missile velocity based on the source's location.
	// Would it be more useful to base it on the actual position of the
	// missile?
	// Answer: No, because this way, you can set up sets of parallel missiles.

	DVector3 velocity = source->Vec3To(dest);
	// Floor and ceiling huggers should never have a vertical component to their velocity
	if (th->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER))
	{
		velocity.Z = 0;
	}
	// [RH] Adjust the trajectory if the missile will go over the target's head.
	else if (pos.Z - source->Z() >= dest->Height)
	{
		velocity.Z += (dest->Height - pos.Z + source->Z());
	}
	th->Vel = velocity.Resized(speed);

	P_SpawnMissileXYZ_ShadowHandling(source,dest,th,pos);
	
	th->AngleFromVel();

	if (th->flags4 & MF4_SPECTRAL)
	{
		th->SetFriendPlayer(owner->player);
	}

	return (!checkspawn || P_CheckMissileSpawn (th, source->radius)) ? th : NULL;
}

DEFINE_ACTION_FUNCTION(AActor, SpawnMissileXYZ)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_OBJECT_NOT_NULL(dest, AActor);
	PARAM_CLASS(type, AActor);
	PARAM_BOOL(check);
	PARAM_OBJECT(owner, AActor);
	ACTION_RETURN_OBJECT(P_SpawnMissileXYZ(DVector3(x,y,z), self, dest, type, check, owner));
}

AActor *P_SpawnMissile(AActor *source, AActor *dest, PClassActor *type, AActor *owner)
{
	if (source == nullptr)
	{
		return nullptr;
	}
	return P_SpawnMissileXYZ(source->PosPlusZ(32 + source->GetBobOffset()), source, dest, type, true, owner);
}

DEFINE_ACTION_FUNCTION(AActor, SpawnMissile)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT_NOT_NULL(dest, AActor);
	PARAM_CLASS(type, AActor);
	PARAM_OBJECT(owner, AActor);
	ACTION_RETURN_OBJECT(P_SpawnMissile(self, dest, type, owner));
}

AActor *P_SpawnMissileZ(AActor *source, double z, AActor *dest, PClassActor *type)
{
	if (source == nullptr)
	{
		return nullptr;
	}
	return P_SpawnMissileXYZ(source->PosAtZ(z), source, dest, type);
}

DEFINE_ACTION_FUNCTION(AActor, SpawnMissileZ)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(z);
	PARAM_OBJECT_NOT_NULL(dest, AActor);
	PARAM_CLASS(type, AActor);
	ACTION_RETURN_OBJECT(P_SpawnMissileZ(self, z, dest, type));
}



AActor *P_OldSpawnMissile(AActor *source, AActor *owner, AActor *dest, PClassActor *type)
{
	if (source == nullptr || type == nullptr)
	{
		return nullptr;
	}
	AActor *th = Spawn (source->Level, type, source->PosPlusZ(32.), ALLOW_REPLACE);

	P_PlaySpawnSound(th, source);
	th->target = owner;		// record missile's originator

	th->Angles.Yaw = source->AngleTo(dest);
	th->VelFromAngle();


	double dist = source->DistanceBySpeed(dest, max(1., th->Speed));
	th->Vel.Z = (dest->Z() - source->Z()) / dist;

	if (th->flags4 & MF4_SPECTRAL)
	{
		th->SetFriendPlayer(owner->player);
	}

	P_CheckMissileSpawn(th, source->radius);
	return th;
}

DEFINE_ACTION_FUNCTION(AActor, OldSpawnMissile)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT_NOT_NULL(dest, AActor);
	PARAM_CLASS(type, AActor);
	PARAM_OBJECT(owner, AActor);
	ACTION_RETURN_OBJECT(P_OldSpawnMissile(self, owner, dest, type));
}


//---------------------------------------------------------------------------
//
// FUNC P_SpawnMissileAngle
//
// Returns NULL if the missile exploded immediately, otherwise returns
// a mobj_t pointer to the missile.
//
//---------------------------------------------------------------------------

AActor *P_SpawnMissileZAimed (AActor *source, double z, AActor *dest, PClassActor *type)
{
	if (source == nullptr || type == nullptr)
	{
		return nullptr;
	}
	DAngle an;
	double dist;
	double speed;
	double vz;

	an = source->Angles.Yaw;

	dist = source->Distance2D (dest);
	speed = GetDefaultSpeed (type);
	dist /= speed;
	vz = dist != 0 ? (dest->Z() - source->Z())/dist : speed;
	an += P_SpawnMissileZAimed_ShadowHandling(source, dest, vz, speed, source->PosAtZ(z));
	return P_SpawnMissileAngleZSpeed (source, z, type, an, vz, speed);
}

DEFINE_ACTION_FUNCTION(AActor, SpawnMissileZAimed)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(z);
	PARAM_OBJECT_NOT_NULL(dest, AActor);
	PARAM_CLASS(type, AActor);
	ACTION_RETURN_OBJECT(P_SpawnMissileZAimed(self, z, dest, type));
}

//---------------------------------------------------------------------------
//
// FUNC P_SpawnMissileAngleZSpeed
//
// Returns NULL if the missile exploded immediately, otherwise returns
// a mobj_t pointer to the missile.
//
//---------------------------------------------------------------------------

AActor *P_SpawnMissileAngleZSpeed (AActor *source, double z,
	PClassActor *type, DAngle angle, double vz, double speed, AActor *owner, bool checkspawn)
{
	if (source == nullptr || type == nullptr)
	{
		return nullptr;
	}
	AActor *mo;

	if (z != ONFLOORZ && z != ONCEILINGZ) 
	{
		z -= source->Floorclip;
	}

	mo = Spawn (source->Level, type, source->PosAtZ(z), ALLOW_REPLACE);

	P_PlaySpawnSound(mo, source);
	if (owner == NULL) owner = source;
	mo->target = owner;
	mo->Angles.Yaw = angle;
	mo->VelFromAngle(speed);
	mo->Vel.Z = vz;

	if (mo->flags4 & MF4_SPECTRAL)
	{
		mo->SetFriendPlayer(owner->player);
	}

	return (!checkspawn || P_CheckMissileSpawn(mo, source->radius)) ? mo : NULL;
}

DEFINE_ACTION_FUNCTION(AActor, SpawnMissileAngleZSpeed)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_FLOAT(z);
	PARAM_CLASS(type, AActor);
	PARAM_ANGLE(angle);
	PARAM_FLOAT(vz);
	PARAM_FLOAT(speed);
	PARAM_OBJECT(owner, AActor);
	PARAM_BOOL(checkspawn);
	ACTION_RETURN_OBJECT(P_SpawnMissileAngleZSpeed(self, z, type, angle, vz, speed, owner, checkspawn));
}


AActor *P_SpawnSubMissile(AActor *source, PClassActor *type, AActor *target)
{
	AActor *other = Spawn(source->Level, type, source->Pos(), ALLOW_REPLACE);

	if (source == nullptr || type == nullptr)
	{
		return nullptr;
	}

	other->target = target;
	other->Angles.Yaw = source->Angles.Yaw;
	other->VelFromAngle();

	if (other->flags4 & MF4_SPECTRAL)
	{
		if (source->flags & MF_MISSILE && source->flags4 & MF4_SPECTRAL)
		{
			other->FriendPlayer = source->FriendPlayer;
		}
		else
		{
			other->SetFriendPlayer(target->player);
		}
	}

	if (P_CheckMissileSpawn(other, source->radius))
	{
		DAngle pitch = P_AimLineAttack(source, source->Angles.Yaw, 1024.);
		other->Vel.Z = -other->Speed * pitch.Sin();
		return other;
	}
	return NULL;
}

DEFINE_ACTION_FUNCTION(AActor, SpawnSubMissile)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_CLASS(cls, AActor);
	PARAM_OBJECT_NOT_NULL(target, AActor);
	ACTION_RETURN_OBJECT(P_SpawnSubMissile(self, cls, target));
}
/*
================
=
= P_SpawnPlayerMissile
=
= Tries to aim at a nearby monster
================
*/

AActor *P_SpawnPlayerMissile (AActor *source, double x, double y, double z,
							  PClassActor *type, DAngle angle, FTranslatedLineTarget *pLineTarget, AActor **pMissileActor,
							  bool nofreeaim, bool noautoaim, int aimflags)
{
	if (source == nullptr || type == nullptr)
	{
		return nullptr;
	}
	aimflags &= ~ALF_IGNORENOAUTOAIM; // just to be safe.

	static const double angdiff[3] = { -5.625, 5.625, 0 };
	DAngle an = angle;
	DAngle pitch;
	FTranslatedLineTarget scratch;
	AActor *defaultobject = GetDefaultByType(type);
	DAngle vrange = DAngle::fromDeg(nofreeaim ? 35. : 0.);

	if (!pLineTarget) pLineTarget = &scratch;
	if (!(aimflags & ALF_NOWEAPONCHECK) && source->player && source->player->ReadyWeapon && ((source->player->ReadyWeapon->IntVar(NAME_WeaponFlags) & WIF_NOAUTOAIM) || noautoaim))
	{
		// Keep exactly the same angle and pitch as the player's own aim
		an = angle;
		pitch = source->Angles.Pitch;
		pLineTarget->linetarget = NULL;
	}
	else // see which target is to be aimed at
	{
		// [XA] If MaxTargetRange is defined in the spawned projectile, use this as the
		//      maximum range for the P_AimLineAttack call later; this allows MaxTargetRange
		//      to function as a "maximum tracer-acquisition range" for seeker missiles.
		double linetargetrange = defaultobject->maxtargetrange > 0 ? defaultobject->maxtargetrange*64 : 16*64.;

		int i = 2;
		do
		{
			an = angle + DAngle::fromDeg(angdiff[i]);
			pitch = P_AimLineAttack (source, an, linetargetrange, pLineTarget, vrange, aimflags);
	
			if (source->player != NULL &&
				!nofreeaim &&
				source->Level->IsFreelookAllowed() &&
				source->player->userinfo.GetAimDist() <= 0.5)
			{
				break;
			}
		} while (pLineTarget->linetarget == NULL && --i >= 0);

		if (pLineTarget->linetarget == NULL)
		{
			an = angle;
			if (nofreeaim || !source->Level->IsFreelookAllowed())
			{
				pitch = nullAngle;
			}
		}
	}

	if (z != ONFLOORZ && z != ONCEILINGZ)
	{
		// Doom spawns missiles 4 units lower than hitscan attacks for players.
		z += source->Center() - source->Floorclip + source->AttackOffset(-4);
		// Do not fire beneath the floor.
		if (z < source->floorz)
		{
			z = source->floorz;
		}
	}
	DVector3 pos = source->Vec2OffsetZ(x, y, z);
	AActor *MissileActor = Spawn (source->Level, type, pos, ALLOW_REPLACE);
	if (pMissileActor) *pMissileActor = MissileActor;
	P_PlaySpawnSound(MissileActor, source);
	MissileActor->target = source;
	MissileActor->Angles.Yaw = an;
	if (MissileActor->flags3 & (MF3_FLOORHUGGER | MF3_CEILINGHUGGER))
	{
		MissileActor->VelFromAngle();
	}
	else
	{
		MissileActor->Vel3DFromAngle(pitch, MissileActor->Speed);
	}

	if (MissileActor->flags4 & MF4_SPECTRAL)
	{
		MissileActor->SetFriendPlayer(source->player);
	}
	if (P_CheckMissileSpawn (MissileActor, source->radius))
	{
		return MissileActor;
	}
	return NULL;
}

DEFINE_ACTION_FUNCTION(AActor, SpawnPlayerMissile)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_CLASS(type, AActor);
	PARAM_ANGLE(angle);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);
	PARAM_OUTPOINTER(lt, FTranslatedLineTarget);
	PARAM_BOOL(nofreeaim);
	PARAM_BOOL(noautoaim);
	PARAM_INT(aimflags);
	AActor *missileactor;
	if (angle == DAngle::fromDeg(1e37)) angle = self->Angles.Yaw;
	AActor *misl = P_SpawnPlayerMissile(self, x, y, z, type, angle, lt, &missileactor, nofreeaim, noautoaim, aimflags);
	if (numret > 0) ret[0].SetObject(misl);
	if (numret > 1) ret[1].SetObject(missileactor), numret = 2;
	return numret;
}


int AActor::GetTeam()
{
	if (player)
	{
		return player->userinfo.GetTeam();
	}

	int myTeam = DesignatedTeam;

	// Check for monsters that belong to a player on the team but aren't part of the team themselves.
	if (myTeam == TEAM_NONE && FriendPlayer != 0)
	{
		myTeam = Level->Players[FriendPlayer - 1]->userinfo.GetTeam();
	}
	return myTeam;

}

bool AActor::IsTeammate (AActor *other)
{
	if (!other)
	{
		return false;
	}
	else if (!deathmatch && player && other->player)
	{
		return (!((flags ^ other->flags) & MF_FRIENDLY));
	}
	else if (teamplay)
	{
		int myTeam = GetTeam();
		int otherTeam = other->GetTeam();

		return (myTeam != TEAM_NONE && myTeam == otherTeam);
	}
	return false;
}

//==========================================================================
//
// AActor :: GetSpecies
//
// Species is defined as the lowest base class that is a monster
// with no non-monster class in between. If the actor specifies an explicit
// species (i.e. not 'None'), that is used. This is virtualized, so special
// monsters can change this behavior if they like.
//
//==========================================================================

FName AActor::GetSpecies()
{
	if (Species != NAME_None)
	{
		return Species;
	}

	PClassActor *thistype = GetClass();

	if (GetDefaultByType(thistype)->flags3 & MF3_ISMONSTER)
	{
		while (thistype->ParentClass)
		{
			if (GetDefaultByType(thistype->ParentClass)->flags3 & MF3_ISMONSTER)
				thistype = static_cast<PClassActor *>(thistype->ParentClass);
			else 
				break;
		}
	}
	return Species = thistype->TypeName; // [GZ] Speeds up future calls.
}

//==========================================================================
//
// AActor :: IsFriend
//
// Checks if two monsters have to be considered friendly.
//
//==========================================================================

bool AActor::IsFriend (AActor *other)
{
	if (flags & other->flags & MF_FRIENDLY)
	{
		if (deathmatch && teamplay)
			return IsTeammate(other) ||
				(FriendPlayer != 0 && other->FriendPlayer != 0 &&
					Level->Players[FriendPlayer-1]->mo->IsTeammate(Level->Players[other->FriendPlayer-1]->mo));

		return !deathmatch ||
			FriendPlayer == other->FriendPlayer ||
			FriendPlayer == 0 ||
			other->FriendPlayer == 0 ||
			Level->Players[FriendPlayer-1]->mo->IsTeammate(Level->Players[other->FriendPlayer-1]->mo);
	}
	// [SP] If friendly flags match, then they are on the same team.
	/*if (!((flags ^ other->flags) & MF_FRIENDLY))
		return true;*/
	return false;
}

//==========================================================================
//
// AActor :: IsHostile
//
// Checks if two monsters have to be considered hostile under any circumstances
//
//==========================================================================

bool AActor::IsHostile (AActor *other)
{
	// Both monsters are non-friendlies so hostilities depend on infighting settings
	if (!((flags | other->flags) & MF_FRIENDLY)) return false;

	// Both monsters are friendly and belong to the same player if applicable.
	if (flags & other->flags & MF_FRIENDLY)
	{
		if (deathmatch && teamplay)
			return !IsTeammate(other) &&
				!(FriendPlayer != 0 && other->FriendPlayer != 0 &&
					Level->Players[FriendPlayer-1]->mo->IsTeammate(Level->Players[other->FriendPlayer-1]->mo));

		return deathmatch &&
			FriendPlayer != other->FriendPlayer &&
			FriendPlayer !=0 &&
			other->FriendPlayer != 0 &&
			!Level->Players[FriendPlayer-1]->mo->IsTeammate(Level->Players[other->FriendPlayer-1]->mo);
	}
	return true;
}

//==========================================================================
//
// AActor :: DoSpecialDamage
//
// override this for special damage effects.
//
//==========================================================================

int AActor::DoSpecialDamage (AActor *target, int damage, FName damagetype)
{
	if (target->player && target->player->mo == target && damage < 1000 &&
		(target->player->cheats & CF_GODMODE || target->player->cheats & CF_GODMODE2))
	{
		return -1;
	}
	else
	{
		if (target->player)
		{
			// Only do this for old style poison damage.
			if (PoisonDamage > 0 && PoisonDuration == INT_MIN)
			{
				P_PoisonPlayer (target->player, this, this->target, PoisonDamage);
				damage >>= 1;
			}
		}
	
		return damage;
	}
}

DEFINE_ACTION_FUNCTION(AActor, DoSpecialDamage)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT_NOT_NULL(target, AActor);
	PARAM_INT(damage);
	PARAM_NAME(damagetype);
	ACTION_RETURN_INT(self->DoSpecialDamage(target, damage, damagetype));
}

int AActor::CallDoSpecialDamage(AActor *target, int damage, FName damagetype)
{
	IFVIRTUAL(AActor, DoSpecialDamage)
	{
		// Without the type cast this picks the 'void *' assignment...
		VMValue params[4] = { (DObject*)this, (DObject*)target, damage, damagetype.GetIndex() };
		VMReturn ret;
		int retval;
		ret.IntAt(&retval);
		VMCall(func, params, 4, &ret, 1);
		return retval;
	}
	else return DoSpecialDamage(target, damage, damagetype);

}

//==========================================================================
//
// AActor :: TakeSpecialDamage
//
//==========================================================================

int AActor::TakeSpecialDamage (AActor *inflictor, AActor *source, int damage, FName damagetype)
{
	FState *death;

	// If the actor does not have a corresponding death state, then it does not take damage.
	// Note that DeathState matches every kind of damagetype, so an actor has that, it can
	// be hurt with any type of damage. Exception: Massacre damage always succeeds, because
	// it needs to work.

	// Always kill if there is a regular death state or no death states at all.
	if (FindState (NAME_Death) != NULL || !HasSpecialDeathStates() || damagetype == NAME_Massacre)
	{
		return damage;
	}
	
	if (inflictor && inflictor->DeathType != NAME_None)
		damagetype = inflictor->DeathType;

	if (damagetype == NAME_Ice)
	{
		death = FindState (NAME_Death, NAME_Ice, true);
		if (death == NULL && !deh.NoAutofreeze && !(flags4 & MF4_NOICEDEATH) &&
			(player || (flags3 & MF3_ISMONSTER)))
		{
			death = FindState(NAME_GenericFreezeDeath);
		}
	}
	else
	{
		death = FindState (NAME_Death, damagetype);
	}
	return (death == NULL) ? -1 : damage;
}

DEFINE_ACTION_FUNCTION(AActor, TakeSpecialDamage)
{
	PARAM_SELF_PROLOGUE(AActor);
	PARAM_OBJECT(inflictor, AActor);
	PARAM_OBJECT(source, AActor);
	PARAM_INT(damage);
	PARAM_NAME(damagetype);
	ACTION_RETURN_INT(self->TakeSpecialDamage(inflictor, source, damage, damagetype));
}


int AActor::CallTakeSpecialDamage(AActor *inflictor, AActor *source, int damage, FName damagetype)
{
	IFVIRTUAL(AActor, TakeSpecialDamage)
	{
		VMValue params[5] = { (DObject*)this, inflictor, source, damage, damagetype.GetIndex() };
		VMReturn ret;
		int retval;
		ret.IntAt(&retval);
		VMCall(func, params, 5, &ret, 1);
		return retval;
	}
	else return TakeSpecialDamage(inflictor, source, damage, damagetype);

}

void AActor::Crash()
{
	// [RC] Weird that this forces the Crash state regardless of flag.
	if(!(flags6 & MF6_DONTCORPSE))
	{
	if (((flags & MF_CORPSE) || (flags6 & MF6_KILLED)) &&
		!(flags3 & MF3_CRASHED) &&
		!(flags & MF_ICECORPSE))
	{
		FState *crashstate = NULL;
		
		int gibh = GetGibHealth();
		if (DamageType != NAME_None)
		{
			if (health < gibh)
			{ // Extreme death
				FName labels[] = { NAME_Crash, NAME_Extreme, DamageType };
				crashstate = FindState (3, labels, true);
			}
			if (crashstate == NULL)
			{ // Normal death
				crashstate = FindState(NAME_Crash, DamageType, true);
			}
		}
		if (crashstate == NULL)
		{
			if (health < gibh)
			{ // Extreme death
				crashstate = FindState(NAME_Crash, NAME_Extreme);
			}
			else
			{ // Normal death
				crashstate = FindState(NAME_Crash);
			}
		}
		if (crashstate != NULL) SetState(crashstate);
		// Set MF3_CRASHED regardless of the presence of a crash state
		// so this code doesn't have to be executed repeatedly.
		flags3 |= MF3_CRASHED;
	}
	}
}

void AActor::SetIdle(bool nofunction)
{
	FState *idle = FindState (NAME_Idle);
	if (idle == NULL) idle = SpawnState;
	SetState(idle, nofunction);
}


int AActor::SpawnHealth() const
{
	int defhealth = StartHealth ? StartHealth : GetDefault()->health;
	if (!(flags3 & MF3_ISMONSTER) || defhealth == 0)
	{
		return defhealth;
	}
	else if (flags & MF_FRIENDLY)
	{
		int adj = int(defhealth * G_SkillProperty(SKILLP_FriendlyHealth));
		return (adj <= 0) ? 1 : adj;
	}
	else
	{
		int adj = int(defhealth * G_SkillProperty(SKILLP_MonsterHealth));
		return (adj <= 0) ? 1 : adj;
	}
}

int AActor::GetMaxHealth(bool withupgrades) const
{
	int ret = 100;
	IFVIRTUAL(AActor, GetMaxHealth)
	{
		VMValue param[] = { const_cast<AActor*>(this), withupgrades };
		VMReturn r(&ret);
		VMCall(func, param, 2, &r, 1);
	}
	return ret;
}

FState *AActor::GetRaiseState()
{
	if (!(flags & MF_CORPSE))
	{
		return NULL;	// not a monster
	}

	if (tics != -1 && // not lying still yet
		!state->GetCanRaise()) // or not ready to be raised yet
	{
		return NULL;
	}

	if (IsKindOf(NAME_PlayerPawn))
	{
		return NULL;	// do not resurrect players
	}

	return FindState(NAME_Raise);
}

void AActor::Revive()
{
	AActor *info = GetDefault();
	FLinkContext ctx;

	bool flagchange = (flags & (MF_NOBLOCKMAP | MF_NOSECTOR)) != (info->flags & (MF_NOBLOCKMAP | MF_NOSECTOR));

	if (flagchange) UnlinkFromWorld(&ctx);
	flags = info->flags;
	if (flagchange) LinkToWorld(&ctx);
	flags2 = info->flags2;
	flags3 = info->flags3;
	flags4 = info->flags4;
	flags5 = info->flags5;
	flags6 = info->flags6;
	flags7 = info->flags7;
	flags8 = info->flags8; 
	if (SpawnFlags & MTF_FRIENDLY) flags |= MF_FRIENDLY;
	DamageType = info->DamageType;
	health = SpawnHealth();
	target = nullptr;
	lastenemy = nullptr;

	// [RH] If it's a monster, it gets to count as another kill
	if (CountsAsKill())
	{
		Level->total_monsters++;
	}

	// [ZZ] resurrect hook
	Level->localEventManager->WorldThingRevived(this);
}

int AActor::GetGibHealth() const
{
	IFVIRTUAL(AActor, GetGibHealth)
	{
		VMValue params[] = { (DObject*)this };
		int h;
		VMReturn ret(&h);
		VMCall(func, params, 1, &ret, 1);
		return h;
	}
	return -SpawnHealth();
}


// killough 11/98:
// Whether an object is "sentient" or not. Used for environmental influences.
// (left precisely the same as MBF even though it doesn't make much sense.)
bool AActor::IsSentient() const
{
	return health > 0 && SeeState != NULL;
}


FSharedStringArena AActor::mStringPropertyData;

const char *AActor::GetTag(const char *def) const
{
	if (Tag != NULL)
	{
		const char *tag = Tag->GetChars();
		if (tag[0] == '$')
		{
			return GStrings(tag + 1);
		}
		else
		{
			return tag;
		}
	}
	else if (def)
	{
		return def;
	}
	else
	{
		return GetClass()->TypeName.GetChars();
	}
}

void AActor::SetTag(const char *def)
{
	if (def == NULL || *def == 0) Tag = nullptr;
	else Tag = mStringPropertyData.Alloc(def);
}

const char *AActor::GetCharacterName() const
{
	if (Conversation && Conversation->SpeakerName.Len() != 0)
	{
		const char *cname = Conversation->SpeakerName.GetChars();
		if (cname[0] == '$')
		{
			return GStrings(cname + 1);
		}
		else return cname;
	}
	return GetTag();
}

void AActor::ClearCounters()
{
	if (CountsAsKill() && health > 0)
	{
		Level->total_monsters--;
		flags &= ~MF_COUNTKILL;
	}
	// Same, for items
	if (flags & MF_COUNTITEM)
	{
		Level->total_items--;
		flags &= ~MF_COUNTITEM;
	}
	// And finally for secrets
	if (flags5 & MF5_COUNTSECRET)
	{
		Level->total_secrets--;
		flags5 &= ~MF5_COUNTSECRET;
	}
}

int AActor::GetModifiedDamage(FName damagetype, int damage, bool passive, AActor *inflictor, AActor *source, int flags)
{
	auto inv = Inventory;
	while (inv != nullptr && !(inv->ObjectFlags & OF_EuthanizeMe))
	{
		auto nextinv = inv->Inventory;
		IFVIRTUALPTRNAME(inv, NAME_Inventory, ModifyDamage)
		{
			VMValue params[8] = { (DObject*)inv, damage, damagetype.GetIndex(), &damage, passive, inflictor, source, flags };
			VMCall(func, params, 8, nullptr, 0);
		}
		inv = nextinv;
	}
	return damage;
}


int AActor::ApplyDamageFactor(FName damagetype, int damage) const
{
	damage = int(damage * DamageFactor);
	if (damage > 0)
	{
		damage = DamageTypeDefinition::ApplyMobjDamageFactor(damage, damagetype, &GetInfo()->DamageFactors);
	}
	return damage;
}

void AActor::SetTranslation(FName trname)
{
	// There is no constant for the empty name...
	if (trname.GetChars()[0] == 0)
	{
		// an empty string resets to the default
		Translation = GetDefault()->Translation;
		return;
	}

	auto tnum = R_FindCustomTranslation(trname);
	if (tnum != INVALID_TRANSLATION)
	{
		Translation = tnum;
	}
	// silently ignore if the name does not exist, this would create some insane message spam otherwise.
}

//---------------------------------------------------------------------------
//
// PROP A_RestoreSpecialPosition
//
//---------------------------------------------------------------------------
static FRandom pr_restore("RestorePos");

void AActor::RestoreSpecialPosition()
{
	// Move item back to its original location
	DVector2 sp = SpawnPoint.XY();

	FLinkContext ctx;
	UnlinkFromWorld(&ctx);
	SetXY(sp);
	LinkToWorld(&ctx, true);
	SetZ(Sector->floorplane.ZatPoint(sp));
	P_FindFloorCeiling(this, FFCF_ONLYSPAWNPOS | FFCF_NOPORTALS);	// no portal checks here so that things get spawned in this sector.

	if (flags & MF_SPAWNCEILING)
	{
		SetZ(ceilingz - Height - SpawnPoint.Z);
	}
	else if (flags2 & MF2_SPAWNFLOAT)
	{
		double space = ceilingz - Height - floorz;
		if (space > 48)
		{
			space -= 40;
			SetZ((space * pr_restore()) / 256. + floorz + 40);
		}
		else
		{
			SetZ(floorz);
		}
	}
	else
	{
		SetZ(SpawnPoint.Z + floorz);
	}
	// Redo floor/ceiling check, in case of 3D floors and portals
	P_FindFloorCeiling(this, FFCF_SAMESECTOR | FFCF_ONLY3DFLOORS | FFCF_3DRESTRICT);
	if (Z() < floorz)
	{ // Do not reappear under the floor, even if that's where we were for the
	  // initial spawn.
		SetZ(floorz);
	}
	if ((flags & MF_SOLID) && (Top() > ceilingz))
	{ // Do the same for the ceiling.
		SetZ(ceilingz - Height);
	}
	// Do not interpolate from the position the actor was at when it was
	// picked up, in case that is different from where it is now.
	ClearInterpolation();
}

//----------------------------------------------------------------------------
//
// DropItem handling
//
//----------------------------------------------------------------------------

DEFINE_FIELD(FDropItem, Next)
DEFINE_FIELD(FDropItem, Name)
DEFINE_FIELD(FDropItem, Probability)
DEFINE_FIELD(FDropItem, Amount)

void PrintMiscActorInfo(AActor *query)
{
	if (query)
	{
		int flagi;
		int querystyle = STYLE_Count;
		for (int style = STYLE_None; style < STYLE_Count; ++style)
		{ // Check for a legacy render style that matches.
			if (LegacyRenderStyles[style] == query->RenderStyle)
			{
				querystyle = style;
				break;
			}
		}
		static const char * renderstyles[]= {"None", "Normal", "Fuzzy", "SoulTrans",
			"OptFuzzy", "Stencil", "Translucent", "Add", "Shaded", "TranslucentStencil",
			"Shadow", "Subtract", "AddStencil", "AddShaded"};

		FLineSpecial *spec = P_GetLineSpecialInfo(query->special);

		Printf("%s @ %p has the following flags:\n   flags: %x", query->GetTag(), query, query->flags.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags & ActorFlags::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags));
		Printf("\n   flags2: %x", query->flags2.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags2 & ActorFlags2::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags2));
		Printf("\n   flags3: %x", query->flags3.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags3 & ActorFlags3::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags3));
		Printf("\n   flags4: %x", query->flags4.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags4 & ActorFlags4::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags4));
		Printf("\n   flags5: %x", query->flags5.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags5 & ActorFlags5::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags5));
		Printf("\n   flags6: %x", query->flags6.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags6 & ActorFlags6::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags6));
		Printf("\n   flags7: %x", query->flags7.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags7 & ActorFlags7::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags7));
		Printf("\n   flags8: %x", query->flags8.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags8 & ActorFlags8::FromInt(1<<flagi)) Printf(" %s", FLAG_NAME(1<<flagi, flags8));
		Printf("\n   flags9: %x", query->flags9.GetValue());
		for (flagi = 0; flagi <= 31; flagi++)
			if (query->flags9 & ActorFlags9::FromInt(1 << flagi)) Printf(" %s", FLAG_NAME(1 << flagi, flags9));
		Printf("\nBounce flags: %x\nBounce factors: f:%f, w:%f", 
			query->BounceFlags.GetValue(), query->bouncefactor,
			query->wallbouncefactor);
		/*for (flagi = 0; flagi < 31; flagi++)
			if (query->BounceFlags & 1<<flagi) Printf(" %s", flagnamesb[flagi]);*/
		Printf("\nRender style = %i:%s, alpha %f\nRender flags: %x", 
			querystyle, ((unsigned)querystyle < countof(renderstyles) ? renderstyles[querystyle] : "Custom"),
			query->Alpha, query->renderflags.GetValue());
		/*for (flagi = 0; flagi < 31; flagi++)
			if (query->renderflags & 1<<flagi) Printf(" %s", flagnamesr[flagi]);*/
		Printf("\nSpecial+args: %s(%i, %i, %i, %i, %i)\nspecial1: %i, special2: %i.",
			(spec ? spec->name : "None"),
			query->args[0], query->args[1], query->args[2], query->args[3], 
			query->args[4],	query->special1, query->special2);
		Printf("\nTID: %d", query->tid);
		Printf("\nCoord= x: %f, y: %f, z:%f, floor:%f, ceiling:%f, height= %f",
			query->X(), query->Y(), query->Z(),
			query->floorz, query->ceilingz, query->Height);
		Printf("\nSpeed= %f, velocity= x:%f, y:%f, z:%f, combined:%f.\n",
			query->Speed, query->Vel.X, query->Vel.Y, query->Vel.Z, query->Vel.Length());
		Printf("Scale: x:%f, y:%f\n", query->Scale.X, query->Scale.Y);
		Printf("FriendlySeeBlocks: %d\n", query->friendlyseeblocks);
		Printf("Target: %s\n", query->target ? query->target->GetClass()->TypeName.GetChars() : "-");
		Printf("Last enemy: %s\n", query->lastenemy ? query->lastenemy->GetClass()->TypeName.GetChars() : "-");
		auto sn = FState::StaticGetStateName(query->state);
		Printf("State:%s, Tics: %d\n", sn.GetChars(), query->tics);
	}
}