Fix prepass batch (#13943)

re0312 · web-flow · commit 3b23aa08647f · 2024-07-14T19:35:36.000Z
# Objective - After #11804 , The queue_prepass_material_meshes function is now executed in parallel with other queue_* systems. This optimization introduced a potential issue where mesh_instance.should_batch() could return false in queue_prepass_material_meshes due to an unset material_bind_group_id.
diff --git a/crates/bevy_pbr/src/prepass/mod.rs b/crates/bevy_pbr/src/prepass/mod.rs
@@ -851,6 +851,9 @@ pub fn queue_prepass_material_meshes<M: Material>(
                 }
             };
 
+            mesh_instance
+                .material_bind_group_id
+                .set(material.get_bind_group_id());
             match mesh_key
                 .intersection(MeshPipelineKey::BLEND_RESERVED_BITS | MeshPipelineKey::MAY_DISCARD)
             {

Original file line number	Diff line number	Diff line change
`@@ -851,6 +851,9 @@ pub fn queue_prepass_material_meshes<M: Material>(`
`851`	`851`	`}`
`852`	`852`	`};`
`853`	`853`
	`854`	`+ mesh_instance`
	`855`	`+ .material_bind_group_id`
	`856`	`+ .set(material.get_bind_group_id());`
`854`	`857`	`match mesh_key`
`855`	`858`	`.intersection(MeshPipelineKey::BLEND_RESERVED_BITS \| MeshPipelineKey::MAY_DISCARD)`
`856`	`859`	`{`