Server Composition Spawner Function Reference

Server Composition Spawner Function Reference

Source-verified 2026-06-24 for auto-wall/spawner notes against docs/source HEAD@de471ea5ba96 (unchanged from eca0e4a7 for checked auto-wall paths), current stable/B74.1 origin/master@f8a76de34, B74.2 origin/claude/b74.2-aicom@21b62b04, B69 8d465fce, B74 b23f557f, Miksuu commit b8389e748243, origin/perf/quick-wins@0076040f, live origin/feat/oa-auto-countermeasures@2015a632 and historical a96fdda2. Paths relative to Missions/[55-2hc]warfarev2_073v48co.chernarus/ unless noted. Arma 2 OA 1.64.

Four closely related functions handle the spawning and destruction lifecycle of all server-side base structures and commander-placed WDDM positions. Server_ConstructPosition and CreateDefenseTemplate build objects; BuildingDamaged and BuildingKilled process the hit/killed event handlers attached to every structure after it is constructed.

---

Registration in Init_Server.sqf

All four functions are compiled at mission start and assigned to global script variables.

Global variable	Source file	Init_Server.sqf line
BuildingDamaged	Server/Functions/Server_BuildingDamaged.sqf	24
BuildingKilled	Server/Functions/Server_BuildingKilled.sqf	26
CreateDefenseTemplate	Server/Functions/Server_CreateDefenseTemplate.sqf	30
Server_ConstructPosition	Server/Functions/Server_ConstructPosition.sqf	31

---

Server_ConstructPosition

File: Server/Functions/Server_ConstructPosition.sqf

The entry point for all commander-placed WDDM defensive positions. Resolves a build-menu anchor classname to its composition template, converts each child's model-space offset to world space using direct trigonometry, and delegates each child to the stock ConstructDefense call.

Signature

[_side, _anchorType, _pos, _dir, _manned] Spawn Server_ConstructPosition

Run via Spawn (not Call) so RequestDefense can return immediately without blocking the PV handler while all composition children (HandleEmptyVehicle/HandleDefense) are spawned asynchronously.

Parameters

#	Name	Type	Notes
0	_side	Side	The building faction (west or east).
1	_anchorType	String	CfgVehicles classname of the WDDM anchor. Must exist in WFBE_POSITION_TEMPLATE_MAP.
2	_pos	Array [x,y,z]	World position for the composition centre.
3	_dir	Number	Facing in Arma degrees (clockwise from north).
4	_manned	Bool	Whether crewable children should be staffed by AI.

Source: Server_ConstructPosition.sqf:9,12-16

Return value

Array of the created objects (one entry per ConstructDefense call that returned a non-nil result). Returns [] immediately on any validation failure.

Caller

Server/PVFunctions/RequestDefense.sqf:16 — invoked when _defenseType is found in WFBE_POSITION_ANCHOR_NAMES:

[_side,_defenseType,_pos,_dir,_manned] Spawn Server_ConstructPosition;

---

Template Resolution

WFBE_POSITION_TEMPLATE_MAP is the single lookup table that maps every anchor classname to a composition template variable name and a faction-specificity flag.

Definition: Server/Init/Init_Defenses.sqf:239-250

WFBE_POSITION_TEMPLATE_MAP = [
    [anchorClass, baseVarName, factionSpecific?],
    ...
];

Resolution logic (Server_ConstructPosition.sqf:19-36):

1. Walk WFBE_POSITION_TEMPLATE_MAP with forEach; match on _anchorType. If no match, log ERROR and return [].
2. If _factionSpecific is true, append "_WEST" (side == west) or "_EAST" (any other side) to _base. If false, use _base unchanged.
3. Retrieve the template array via missionNamespace getVariable _tplName. If nil or empty, log ERROR/exit.

Full anchor-to-template map (Init_Defenses.sqf:239-250):

Anchor classname	Base variable	Faction-specific	Description
Land_Ind_BoardsPack1	WFBE_NEURODEF_AAPOS	Yes	AA light (2 AI)
Land_CncBlock_Stripes	WFBE_NEURODEF_AAPOS_HEAVY	Yes	AA heavy (4 AI)
Land_Barrel_sand	WFBE_NEURODEF_ARTYPOS_LIGHT	Yes	Artillery light (1 AI gun)
Land_Ind_BoardsPack2	WFBE_NEURODEF_ARTYPOS	Yes	Artillery heavy (4 AI, 3-gun battery)
Land_WoodenRamp	WFBE_NEURODEF_MIXEDPOS	Yes	Mixed light (2 AI: MG + AT)
RoadCone	WFBE_NEURODEF_MIXEDPOS_HEAVY	Yes	Mixed heavy (4 AI)
Paleta1	WFBE_NEURODEF_WALL_STRAIGHT	No	Straight wall section
Paleta2	WFBE_NEURODEF_WALL_CORNER	No	Corner wall section
Land_Ind_Timbers	WFBE_NEURODEF_WALL_GATE	No	Gate wall section

WFBE_POSITION_ANCHOR_NAMES (Init_Defenses.sqf:250) is the flat array of all anchor classnames; RequestDefense.sqf uses find against it to decide whether to route through Server_ConstructPosition or the single-defense path.

---

World-Space Rotation

Each child's position is in model space (relative offset from the composition centre). The function converts to world space at Server_ConstructPosition.sqf:50-56:

_worldPos = [
    (_pos select 0) + (_relPos select 0) * (cos _dir) + (_relPos select 1) * (sin _dir),
    (_pos select 1) - (_relPos select 0) * (sin _dir) + (_relPos select 1) * (cos _dir),
    0
];
_worldDir = _dir - _relDir;

Historical note: A previous iteration spawned a Land_HelipadEmpty "origin" object and used modelToWorld to transform child offsets. That approach was abandoned because the helper vehicle spawned at [0,0,0] (the map corner) rather than at _pos, placing the entire composition approximately 12 km away. The direct trigonometry method is deterministic and requires no spawned helper. (Server_ConstructPosition.sqf:39-42)

---

ConstructDefense delegation

For each child entry [_cls, _relPos, _relDir], Server_ConstructPosition calls:

[_cls, _side, _worldPos, _worldDir, _manned, false,
    missionNamespace getVariable "WFBE_C_BASE_DEFENSE_MANNING_RANGE",
    false, true] Call ConstructDefense;

Server_ConstructPosition.sqf:60

Argument	Value	Notes
class	_cls	From template entry
side	_side	Caller's faction
position	_worldPos	Computed above
direction	_worldDir	_dir - _relDir
manned	_manned	Passed through from request
arg 5	false	builtByRepairTruck — always false for WDDM positions
manning range	WFBE_C_BASE_DEFENSE_MANNING_RANGE	Default 250 m (Init_CommonConstants.sqf:126)
arg 7	false
arg 8	true	WDDM child flag

Every crewable child (guns, AA pods) passes through ConstructDefense identically to a single player-built defense: AI manning, score registration, and artillery-enable all apply. Props (walls, sandbags, ammo boxes) are also handled by the same path.

Object tagging: Each returned object is tagged with a per-placement composite ID so downstream systems can count distinct placed compositions (Server_ConstructPosition.sqf:43-45,67):

WFBE_WDDMPlacementCounter = WFBE_WDDMPlacementCounter + 1;
_placementID = format ["%1_%2", _anchorType, str WFBE_WDDMPlacementCounter];
// ...
_one setVariable ["WFBE_WDDMPositionAnchor", _placementID, true];

The ID is the anchor classname plus a global monotonic counter (e.g. "Land_Ind_BoardsPack1_1", "Land_Ind_BoardsPack1_2"). All child objects from the same placement share one ID; two separate placements of the same anchor type get different IDs. RequestDefense.sqf (lines 156-160) deduplicates these values into _seenIDs to count the number of distinct compositions near a base — a count that requires unique-per-placement IDs, not bare classnames.

---

WFBE_NEURODEF_* Template Format

Every composition template is an array of child entries stored in missionNamespace:

[[classname, [relX, relY, relZ], relDir], ...]

Field	Type	Notes
classname	String	CfgVehicles class for createVehicle / ConstructDefense
[relX, relY, relZ]	Array	Model-space offset from composition origin; Z is zeroed by the spawner
relDir	Number	Local facing offset; subtracted from _dir to get world direction

Faction-specific template roster (Init_Defenses.sqf):

Template variable	Line	WEST guns	EAST guns
WFBE_NEURODEF_AAPOS_WEST/EAST	136/144	Stinger_Pod_US_EP1 ×2	ZU23_TK_EP1, Igla_AA_pod_TK_EP1
WFBE_NEURODEF_AAPOS_HEAVY_WEST/EAST	191/199	Stinger_Pod_US_EP1 ×3 + M2StaticMG	ZU23_TK_EP1 ×2 + Igla_AA_pod_TK_EP1 + DSHKM_TK_INS_EP1
WFBE_NEURODEF_ARTYPOS_LIGHT_WEST/EAST	224/230	M119_US_EP1 ×1	D30_TK_EP1 ×1
WFBE_NEURODEF_ARTYPOS_WEST/EAST	154/163	M119_US_EP1 ×3 + M2StaticMG	D30_TK_EP1 ×3 + DSHKM_TK_INS_EP1
WFBE_NEURODEF_MIXEDPOS_WEST/EAST	174/181	M2StaticMG + TOW_TriPod_US_EP1	DSHKM_TK_INS_EP1 + SPG9_TK_INS_EP1
WFBE_NEURODEF_MIXEDPOS_HEAVY_WEST/EAST	207/216	M2StaticMG ×2 + TOW_TriPod_US_EP1 + Stinger_Pod_US_EP1	DSHKM_TK_INS_EP1 ×2 + Metis_TK_EP1 + Igla_AA_pod_TK_EP1

Neutral wall templates (no faction suffix):

Template variable	Line	Contents
WFBE_NEURODEF_WALL_STRAIGHT	120	Straight HESCO/barrier row
WFBE_NEURODEF_WALL_CORNER	124	Corner barrier arrangement
WFBE_NEURODEF_WALL_GATE	129	Barrier row with access gap

---

CreateDefenseTemplate

File: Server/Functions/Server_CreateDefenseTemplate.sqf
Global alias: CreateDefenseTemplate (Init_Server.sqf:25)

Spawns a wall/barrier ring around an already-placed structure object. Used exclusively by the site construction pipeline — not by WDDM commander positions (which go through Server_ConstructPosition + ConstructDefense instead).

Signature

[_origin, _template, _existingTemplate] Call CreateDefenseTemplate

_existingTemplate is optional; omit it or pass an empty array for a fresh build.

Parameters

#	Name	Type	Default	Notes
0	_origin	Object	(required)	The structure the walls should surround; its getDir and modelToWorld drive placement.
1	_template	Array	(required)	WFBE_NEURODEF_*_WALLS array; nil or non-array exits with WARNING.
2	_existingTemplate	Array	[]	Array of previously spawned objects at the same indices. Any that are alive are skipped and reused.

Source: Server_CreateDefenseTemplate.sqf:2-4

Return value

Array of objects in template-index order. Slots where an existing object was reused contain the original object; slots that were freshly created contain the new vehicle.

Behavior

Server_CreateDefenseTemplate.sqf:20-44

For each entry [_object, _relPos, _relDir] in _template:

1. If _i < count _existingTemplate and alive (_existingTemplate select _i) is true, skip creation and reuse the existing object.
2. Otherwise: createVehicle [_object, [0,0,0], [], 0, "NONE"]; tag it wfbe_defense = true; position via _origin modelToWorld _relPos (z zeroed); set direction getDir _origin - _relDir.

This incremental-rebuild pattern means calling CreateDefenseTemplate again with the current wall array safely fills only destroyed slots without disturbing intact barriers.

Note: CreateDefenseTemplate uses modelToWorld on the structure origin, which is reliable because _origin is a fully positioned, non-null object — unlike the abandoned Land_HelipadEmpty approach in Server_ConstructPosition. The [0,0,0] spawn location is immediately overwritten by setPos.

Callers

Site type	Caller file	Call line
HQ	Server/Construction/Construction_HQSite.sqf	39
Medium (Barracks, Factory, etc.)	Server/Construction/Construction_MediumSite.sqf	126
Small (Service point, light factory)	Server/Construction/Construction_SmallSite.sqf	111

The Medium and Small site callers resolve the wall template via missionNamespace getVariable format ["WFBE_NEURODEF_%1_WALLS", _rlType]. The HQ caller passes the hardcoded string "WFBE_NEURODEF_HEADQUARTERS_WALLS" directly (no format call, no _rlType variable). Branch note from the 2026-06-24 B74.2 current-head auto-wall refresh: docs/source, current Miksuu and perf have no SmallSite/MediumSite structure exclusions beyond the global toggle, historical a96fdda2 and live origin/feat/oa-auto-countermeasures@2015a632 exclude only AARadar, and current stable/B74.1/B74.2/B69/B74 exclude AARadar/CBRadar for SmallSite plus AARadar/Bank/Reserve/ArtilleryRadar for MediumSite. d472da6a..21b62b04 is empty for checked auto-wall paths, and B74.2 construction diffs add source-Chernarus stats attribution only, not a wall-gate change.

Auto-wall gate: isAutoWallConstructingEnabled is a mission-global value. Docs/source HEAD@de471ea5ba96, current Miksuu and perf initialize it false at Common/Init/Init_Common.sqf:201; current stable/B74.1, current B74.2, B69 and B74 initialize it true at :214; historical a96fdda2 initializes it true at :201, while live origin/feat/oa-auto-countermeasures@2015a632 initializes it true at :202 with the same global request path. Players with the commander role can toggle it via User14 keybind (coin_interface.sqf:180,207-217); the new value is sent to the server via the RequestAutoWallConstructinChange public variable (Common/Init/Init_PublicVariables.sqf:21; handler writes one global at RequestAutoWallConstructinChange.sqf:3-7).

Per-structure wall templates (Init_Defenses.sqf):

_rlType	Template variable	Line
Barracks	WFBE_NEURODEF_BARRACKS_WALLS	4
Light (light factory)	WFBE_NEURODEF_LIGHT_WALLS	11
CommandCenter	WFBE_NEURODEF_COMMANDCENTER_WALLS	24
ServicePoint	WFBE_NEURODEF_SERVICEPOINT_WALLS	34 (empty array)
AARadar	WFBE_NEURODEF_AARADAR_WALLS	39 (empty array, also caller-gated)
Headquarters	WFBE_NEURODEF_HEADQUARTERS_WALLS	351
Heavy (heavy factory)	WFBE_NEURODEF_HEAVY_WALLS	377
Aircraft (aircraft factory)	WFBE_NEURODEF_AIRCRAFT_WALLS	393

---

BuildingDamaged

File: Server/Functions/Server_BuildingDamaged.sqf
Global alias: BuildingDamaged (Init_Server.sqf:19)

Attached as a "hit" event handler to every constructed structure. Applies server-side damage reduction and throttles the "IsUnderAttack" side notification.

Event handler shape

_site addEventHandler ["hit", {_this Spawn BuildingDamaged}];

_this in the EH is [hitObject, causedBy, damage] in Arma 2 OA. The function reads arguments positionally:

_this index	Variable	Notes
0	_structure	The hit building
1	_damagedBy	Causer (object or unit that caused the hit; not used for logic, read only)
2	_damage	Raw damage value from the hit

Server_BuildingDamaged.sqf:3-5

Damage reduction

Server_BuildingDamaged.sqf:6

_redu = if (_structure isKindOf "Warfare_HQ_base_unfolded") then {5}
        else {missionNamespace getVariable "WFBE_C_STRUCTURES_DAMAGES_REDUCTION"};

Structure	Reduction divisor	Source
Warfare_HQ_base_unfolded (unfolded mobile HQ)	5 (hardcoded)	Server_BuildingDamaged.sqf:6
All other structures	WFBE_C_STRUCTURES_DAMAGES_REDUCTION = 6	Init_CommonConstants.sqf:313

The reduced damage is not written back to the object's damage state — this function only fires the side alert. Actual structure HP is governed by the handleDamage EH registered separately (Construction_MediumSite.sqf:144-148, Construction_SmallSite.sqf:128-133).

Side alert throttle

Server_BuildingDamaged.sqf:10-14

Fires a SideMessage "IsUnderAttack" only when:

• The structure is not already at full destruction (getDammage + _damage / _redu < 1), and
• At least 2 seconds have elapsed since the last alert (time - wfbe_structure_lasthit > 2), and
• The hit was meaningful (_damage > 0.05).

The per-side timestamp is stored in the side logic object: _logik setVariable ["wfbe_structure_lasthit", time].

---

BuildingKilled

File: Server/Functions/Server_BuildingKilled.sqf
Global alias: BuildingKilled (Init_Server.sqf:21)

Attached as a "killed" event handler to medium and small site structures (not HQ — HQ has its own WFBE_SE_FNC_OnHQKilled). Handles kill credit, score, supplies, and structural bookkeeping before deleting the vehicle.

Event handler shape

Attached via a compiled format string so the structure type is baked in at construction time:

Call Compile Format ["_site AddEventHandler ['killed',{[_this select 0,_this select 1,'%1'] Spawn BuildingKilled}];", _type];

Construction_MediumSite.sqf:149, Construction_SmallSite.sqf:134

Parameters (as received by the function)

Index	Variable	Notes
0	_structure	The killed building object
1	_killer	The unit responsible
2	_type	CfgVehicles class of _structure, baked in at EH attachment

Server_BuildingKilled.sqf:2-4

Bounty table

Server_BuildingKilled.sqf:26-35

Uses isKindOf matching, so subclasses are covered. The default branch catches any type not explicitly listed.

isKindOf match	_bounty
Base_WarfareBBarracks	3000
Base_WarfareBLightFactory	4500
Base_WarfareBHeavyFactory	7000
Base_WarfareBAircraftFactory	8000
Base_WarfareBUAVterminal	5000
Base_WarfareBVehicleServicePoint	3000
BASE_WarfareBAntiAirRadar	8000
default	3000

Score calculation

Server_BuildingKilled.sqf:38-47,64-65

Note: The _score switch (Server_BuildingKilled.sqf:38-47) returns 0 for the default case. Structures not explicitly listed in the switch yield no score despite the _bounty switch awarding a default of 3000. Only the seven explicitly matched types produce a non-zero score before the 3× multiplier is applied.

Base score: _bounty * WFBE_C_UNITS_BOUNTY_COEF / 100
WFBE_C_UNITS_BOUNTY_COEF = 1 (Init_CommonConstants.sqf:375), making the initial score equal to _bounty / 100.

Final score: _score * 3 — a hardcoded 3× multiplier applied after the bounty calculation.

_score = _score * 3;  // Server_BuildingKilled.sqf:65
['SRVFNCREQUESTCHANGESCORE', [leader _killerGroup, score leader _killerGroup + _score]]
    Spawn WFBE_SE_FNC_HandlePVF;

Score is applied to the leader of the killer's group, not the killer directly.

Guerrilla barracks special case

Server_BuildingKilled.sqf:49-58

When typeOf _structure == "Gue_WarfareBBarracks" (the GUER/resistance barracks), the function:

1. Overrides _bounty to 3000 and _supplies to 500.
2. Sends a "HeadHunterReceiveBountyInSupplies" notification to the killer's side.
3. Calls [_side_killer, 500, "", false] Call ChangeSideSupply to credit supplies directly.
4. Recalculates score from the new bounty before the 3× multiplier applies.

Teamkill path

If side _killer == _side (structure's side), no score or supplies are awarded; a "BuildingTeamkill" message is broadcast to the building side. (Server_BuildingKilled.sqf:17-20)

Post-kill bookkeeping

Server_BuildingKilled.sqf:81-96

1. Finds _type in WFBE_%1STRUCTURENAMES for the building side.
2. Decrements wfbe_structures_live at the matching index in the side logic object.
3. Removes _structure from wfbe_structures.
4. Fires a SideMessage "Destroyed".
5. sleep 10 — 10-second grace period before deleteVehicle _structure.

Resistance-side structures (_side == resistance) skip steps 1–4 since resistance has no side logic object or structure-limit tracking.

---

Developer Notes

Adding a new WDDM position type: Register the anchor classname in WFBE_POSITION_TEMPLATE_MAP (Init_Defenses.sqf:239) and add both _WEST and _EAST template variables above it (or set factionSpecific = false if both sides share the layout). Without the map entry, Server_ConstructPosition logs an ERROR and returns [] silently — no in-game feedback to the commander.

Do not re-introduce modelToWorld in Server_ConstructPosition: The direct-trig approach is intentional. Any vehicle spawned at [0,0,0] for use as a modelToWorld origin will land at the map corner because Arma 2 OA does not teleport newly created vehicles to a requested position before the next game frame when that position is inside createVehicle.

CreateDefenseTemplate incremental rebuild: Pass the existing wall array as argument 2 when rebuilding a destroyed structure's walls. Alive objects at matching indices are left in place; only destroyed indices are re-created. This avoids duplicate props overlapping with survivors.

---

Continue Reading

• Construction-And-CoIn-Systems-Atlas — high-level map of all construction pipeline files and how site types relate.
• Defense-Structures-Catalog — full catalog of buildable defense classnames per faction, including those used inside WFBE_NEURODEF compositions.
• Kill-And-Score-Pipeline — end-to-end scoring architecture; covers WFBE_SE_FNC_HandlePVF, SRVFNCREQUESTCHANGESCORE, and bounty coefficient interactions.
• Server-Gameplay-Runtime-Atlas — server init sequence and which globals are available at each phase.
• Variable-And-Naming-Conventions — WFBE_C_* constant naming rules, WFBE_NEURODEF_* namespace, and wfbe_defense object variable conventions.