diff --git a/src/commands.rs b/src/commands.rs
index f7cfa86..f00034d 100644
--- a/src/commands.rs
+++ b/src/commands.rs
@@ -14,10 +14,13 @@ impl Plugin for CommandsPlugin {
     fn build(&self, app: &mut App) {
         app.add_systems(Startup, load_defs);
         app.add_systems(Update, spawn_entities);
+        app.add_systems(PreUpdate, hide_colliders
+            .run_if(any_with_component::<NeedsSceneColliderRemoved>));
         app.add_event::<SpawnEvent>();
     }
 }
 
+#[derive(Component)] pub struct NeedsSceneColliderRemoved;
 #[derive(Event)] pub struct SpawnEvent(ParserState);
 #[derive(PartialEq, Clone)]
 enum DefClass {
@@ -508,6 +511,7 @@ fn spawn_entities(
                         .with_layers_for_name("Collider", CollisionLayers::ALL)
                         //.with_density_for_name("Collider", state.density)
                     );
+                    actor.insert(NeedsSceneColliderRemoved);
                 }
                 else {
                     actor.insert(state.collider.clone());
@@ -611,3 +615,14 @@ fn spawn_entities(
         }
     }
 }
+
+
+pub fn hide_colliders(
+    mut q_mesh: Query<(&mut Visibility, &Name), (With<NeedsSceneColliderRemoved>, With<Handle<Mesh>>)>,
+) {
+    for (mut visibility, name) in &mut q_mesh {
+        if name.as_str() == "Collider" {
+            *visibility = Visibility::Hidden;
+        }
+    }
+}
diff --git a/src/shading.rs b/src/shading.rs
index e1da827..85880b1 100644
--- a/src/shading.rs
+++ b/src/shading.rs
@@ -19,3 +19,14 @@ impl Material for JupitersRing {
     }
 }
 
+
+#[derive(Asset, TypePath, AsBindGroup, Debug, Clone)]
+pub struct AsteroidSurface {
+}
+
+impl Material for AsteroidSurface {
+    fn fragment_shader() -> ShaderRef {
+        "shaders/material_asteroid.wgsl".into()
+    }
+}
+
diff --git a/src/world.rs b/src/world.rs
index 096a051..ce64583 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -48,7 +48,6 @@ impl Plugin for WorldPlugin {
     fn build(&self, app: &mut App) {
         app.add_systems(Startup, setup);
         app.add_systems(Update, handle_cheats);
-        app.add_systems(PreUpdate, hide_colliders); // gotta do this better
         app.add_systems(PostUpdate, handle_despawn);
         app.add_systems(Update, spawn_despawn_asteroids);
         app.add_plugins(PhysicsPlugins::default());
@@ -451,17 +450,6 @@ fn handle_cheats(
     }
 }
 
-
-pub fn hide_colliders(
-    mut q_mesh: Query<(&mut Visibility, &Name), With<Handle<Mesh>>>,
-) {
-    for (mut visibility, name) in &mut q_mesh {
-        if name.as_str() == "Collider" {
-            *visibility = Visibility::Hidden;
-        }
-    }
-}
-
 // A variant of bevy_xpbd_3d::plugins::position_to_transform that adjusts
 // the rendering position to center entities at the player camera.
 // This avoids rendering glitches when very far away from the origin.