diff --git a/src/physics.rs b/src/physics.rs
index 93b8d91..c7a9f2f 100644
--- a/src/physics.rs
+++ b/src/physics.rs
@@ -153,13 +153,13 @@ impl WalkState{
 
 #[derive(Default)]
 struct PhysicsModels{
-	meshes:Vec<PhysicsMesh>,
-	models:Vec<PhysicsModel>,
+	meshes:HashMap<PhysicsMeshId,PhysicsMesh>,
+	models:HashMap<PhysicsModelId,PhysicsModel>,
 	//separate models into Contacting and Intersecting?
 	//wrap model id with ContactingModelId and IntersectingModelId
 	//attributes can be split into contacting and intersecting (this also saves a bit of memory)
 	//can go even further and deduplicate General attributes separately, reconstructing it when queried
-	attributes:Vec<PhysicsCollisionAttributes>,
+	attributes:HashMap<PhysicsAttributesId,PhysicsCollisionAttributes>,
 }
 impl PhysicsModels{
 	fn clear(&mut self){