Example works, not sure why gray in game.

Going to move on to some smaller wins

assets/examples/shaders/dissolve.wgsl

@@ -63,7 +63,7 @@ fn fragment(
 	var out: FragmentOutput;
 	out.color = apply_pbr_lighting(pbr_input);
 
-	var pos = vec2(in.uv * 2.0);
+	var pos = vec2(in.uv * 2.718);
 
 	var n = fbm(pos);
 

assets/shaders/dissolve.wgsl

@@ -70,6 +70,7 @@ fn fragment(
 	var cutoff = dissolve.percentage;
 
 	if n > cutoff {
+        out.color = vec4(0.0, 0.0, 0.0, cutoff);
 		discard;
 	}
 

examples/shaders.rs

@@ -15,30 +15,16 @@ fn main() {
 		))
 		.add_systems(Startup, setup)
 		.add_systems(Update, rotate)
+		.add_systems(Update, setup_material)
 		.run();
 }
 
 fn setup(
 	mut commands: Commands,
-	mut meshes: ResMut<Assets<Mesh>>,
+	assets: Res<AssetServer>,
-	mut materials: ResMut<Assets<MyMat>>,
 ) {
-	commands.spawn(MaterialMeshBundle {
+	commands.spawn(SceneBundle {
-		mesh: meshes.add(
+		scene: assets.load("models/Martian Chess.glb#Scene0"),
-			Mesh::try_from(shape::Box {
-				..default()
-			}).unwrap(),
-		),
-		transform: Transform::from_xyz(0.0, 0.5, 0.0),
-		material: materials.add(ExtendedMaterial {
-			base: StandardMaterial {
-				base_color: Color::RED,
-				opaque_render_method: OpaqueRendererMethod::Auto,
-				alpha_mode: AlphaMode::Mask(0.5),
-				..default()
-			},
-			extension: MatExt { cutoff: 0.5 },
-		}),
 		..default()
 	});
 
@@ -69,6 +55,30 @@ impl MaterialExtension for MatExt {
 	}
 }
 
+fn setup_material(
+	events: Query<(Entity, &Handle<StandardMaterial>), Added<Handle<StandardMaterial>>>,
+	standard_materials: Res<Assets<StandardMaterial>>,
+	mut materials: ResMut<Assets<MyMat>>,
+	mut commands: Commands,
+) {
+	events.iter().for_each(|(entity, handle)| {
+		// Extension we will add to existing gltf-sourced materials
+		let extension = MatExt { cutoff: 1.0 };
+		// Base material we will extend for the duration of the dissolve effect
+		let mut base = standard_materials.get(handle).expect("Resolve material data").clone();
+
+		base.opaque_render_method = OpaqueRendererMethod::Auto;
+		base.alpha_mode = AlphaMode::Mask(0.5);
+
+		commands.entity(entity).insert(
+			materials.add(ExtendedMaterial {
+				base,
+				extension,
+			})
+		).remove::<Handle<StandardMaterial>>();
+	})
+}
+
 fn rotate(
 	mut query: Query<&mut Transform, With<Handle<Mesh>>>,
 	time: Res<Time>,
@@ -76,8 +86,8 @@ fn rotate(
 ) {
 	query.iter_mut().for_each(|mut t| {
 		t.rotate_local_y(time.delta_seconds() / 2.0);
-		t.rotate_local_z(time.delta_seconds() / 2.0);
+		// t.rotate_local_z(time.delta_seconds() / 2.0);
-		t.rotate_local_x(time.delta_seconds() / 2.0);
+		// t.rotate_local_x(time.delta_seconds() / 2.0);
 	});
 	materials.iter_mut().for_each(|(_id, m)| {
 		m.extension.cutoff = time.elapsed_seconds().sin().abs();

src/display3d.rs

@@ -1287,7 +1287,7 @@ fn capture_piece(
     mut commands: Commands,
     time: Res<Time>,
 ) {
-    let duration: f32 = 2.0;
+    let duration: f32 = 3.0;
 
     match *state {
         Some(s) => {
@@ -1374,9 +1374,12 @@ fn capture_piece(
                                     commands.entity(entity).remove::<Handle<DissolveMaterial>>();
 
                                     // Re-add the original material
-                                    let orig = backup_material.get(entity).expect("Entity has original material");
+                                    if let Ok(Backup(orig)) = backup_material.get(entity) {
-                                    commands.entity(entity).insert(orig.0.clone());
+                                        commands.entity(entity).insert(orig.clone());
                                         commands.entity(entity).remove::<Backup<Handle<StandardMaterial>>>();
+                                    } else {
+                                        warn!("Entity {} does not have original material")
+                                    }
                                 }
                             });
                     }