support multiple thrown projectiles

src/abilities/mod.rs

@@ -44,6 +44,7 @@ pub struct TriggerData {
     rot: Quat,
     pos: Vec3,
     target_layer: GameLayer,
+    head: usize,
 }
 
 impl TriggerData {
@@ -53,6 +54,7 @@ impl TriggerData {
         rot: Quat,
         pos: Vec3,
         target_layer: GameLayer,
+        head: usize,
     ) -> Self {
         Self {
             target,
@@ -60,6 +62,7 @@ impl TriggerData {
             rot,
             pos,
             target_layer,
+            head,
         }
     }
 }
@@ -135,6 +138,7 @@ fn on_trigger_state(
             pos: transform.translation,
             target: target.0,
             target_layer: GameLayer::Npc,
+            head: state.head,
         };
 
         active_heads.use_ammo(time.elapsed_secs());