From 3b23aa08647f39a152342ad2530c7dd946ff7b1a Mon Sep 17 00:00:00 2001
From: re0312 <45868716+re0312@users.noreply.github.com>
Date: Mon, 15 Jul 2024 03:35:36 +0800
Subject: [PATCH] Fix prepass batch (#13943)

# 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.
---
 crates/bevy_pbr/src/prepass/mod.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/bevy_pbr/src/prepass/mod.rs b/crates/bevy_pbr/src/prepass/mod.rs
index 5330e055ee..0d5757a687 100644
--- 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)
             {