Add fix for player-limb collisions

source/server/ai/zombie_core.qc

@@ -1537,6 +1537,12 @@ void(entity szombie)  SetUpHitBoxes =
 	szombie.rarm.classname = "ai_zombie_rarm";
 	szombie.rarm.takedamage = DAMAGE_YES;
 	
+#ifdef PC
+	szombie.head.dimension_solid = HITBOX_DIM_LIMBS;
+	szombie.larm.dimension_solid = HITBOX_DIM_LIMBS;
+	szombie.rarm.dimension_solid = HITBOX_DIM_LIMBS;
+#endif	// PC
+
 	local entity oldself = self;
 	self = szombie;
 	SetZombieHitBox(BASE_BBOX);
@@ -1645,7 +1651,10 @@ void(entity where) spawn_a_zombieB =
 	#endif
 	
 	
-	szombie.solid = szombie.head.solid = SOLID_CORPSE;
+	szombie.solid = SOLID_CORPSE;
+#ifdef PC
+	szombie.dimension_solid = HITBOX_DIM_ZOMBIES;
+#endif // PC
 	szombie.movetype = MOVETYPE_WALK;
 	setmodel(szombie, "models/ai/zb#.mdl");
 	szombie.hop_step = 0;

source/server/defs/custom.qc

@@ -258,6 +258,11 @@ float crawler_num;
 #define		WIDLEBOX 	16
 //========================
 
+// Definitions for the `.dimension_hit` and `.dimension_solid` fields
+// Used to let limbs be non-solid to player bbox but still be hit by player tracelines
+#define HITBOX_DIM_LIMBS 1
+#define HITBOX_DIM_ZOMBIES 2
+
 //we're using usedent for who is currently hopping the window
 //Used for windows to keep track of what zombies are at windows
 .entity box1owner, box2owner, box3owner;

source/server/player.qc

@@ -517,6 +517,10 @@ void() PlayerSpawn =
 	self.isspec = FALSE;
 	self.classname = "player";
 	self.solid = SOLID_BBOX;
+	// We can only collide with zombies (and not their limbs)
+#ifdef PC
+	self.dimension_hit = HITBOX_DIM_ZOMBIES;
+#endif // PC
 	setmodel(self, "models/player.mdl");
 	self.movetype = MOVETYPE_WALK;
 	self.max_health = self.health = 100;

source/server/weapons/weapon_core.qc

@@ -1547,7 +1547,13 @@ void(float side) W_Fire =
 
 	// Weapon Projectile/Trace Logic.
 	if (Util_WeaponFiresTraceshot(self.weapon)) {
+#ifdef PC
+		self.dimension_hit = HITBOX_DIM_LIMBS | HITBOX_DIM_ZOMBIES;
+#endif // PC
 		FireTrace(shotcount, spread, damage, side);
+#ifdef PC
+		self.dimension_hit = HITBOX_DIM_ZOMBIES;
+#endif // PC
 	}
 
 	switch(firetype) {