Prevent collision with triggers

[szapp]

Projectiles can collide with triggers (levers, switches). However, this behavior is not disabled for triggers that should not respond to objects. Projectiles collide with any trigger which causes a loud metallic noise and will cause the projectile to drop in some cases.

Fix this with this script.

Make sure triggers in the original gothic are initialized with the correct respondToObject flags.

/* ... */

const int oCAIArrow__CanThisCollideWith = 6952080; //0x6A1490 // Hook length 7
const int zCTrigger_vtbl = 8627196;
const int zCTriggerScript_vtbl = 8582148;

/* ... */

// virtual int __thiscall oCAIArrow::CanThisCollideWith(class zCVob *)
HookEngineF(oCAIArrow__CanThisCollideWith, 7, freeAimTriggerCollisionCheck);

/* ... */

func void freeAimTriggerCollisionCheck() {
    var int vobPtr; vobPtr = ESP + 4;
    var int shooter; shooter = MEM_ReadInt(ECX + 92);
    var int vtbl; vtbl = MEM_ReadInt(MEM_ReadInt(vobPtr));
    if(vtbl != zCTrigger_vtbl) && (vtbl != zCTriggerScript_vtbl) { return; }; // It is no Trigger
    var zCTrigger trigger; trigger = _^(MEM_ReadInt(vobPtr));
    if (trigger.bitfield & zCTrigger_bitfield_respondToObject) { return; }; // Object-reacting trigger
    MEM_WriteInt(vobPtr, shooter); // The engine ignores the shooter
};

Source

[szapp]

Fix #99 apply trigger collision fix