From c74617a82deeab751f46d92b5da887a0500de995 Mon Sep 17 00:00:00 2001
From: Andrea Gargaro <devgargaro@gmail.com>
Date: Tue, 24 Sep 2024 21:52:36 +0200
Subject: [PATCH] Fix patch material (#9)

Fixed exception thrown when material to patch used 'this' within onBeforeMaterial.
---
 src/objects/InstancedMesh2.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/objects/InstancedMesh2.ts b/src/objects/InstancedMesh2.ts
index c965093..5257782 100644
--- a/src/objects/InstancedMesh2.ts
+++ b/src/objects/InstancedMesh2.ts
@@ -156,7 +156,7 @@ export class InstancedMesh2<
   protected patchMaterial(material: Material): void {
     if (material.isInstancedMeshPatched) throw new Error('Cannot reuse already patched material.');
 
-    const onBeforeCompile = material.onBeforeCompile;
+    const onBeforeCompile = material.onBeforeCompile.bind(material);
 
     material.onBeforeCompile = (shader: WebGLProgramParametersWithUniforms, renderer) => {
       if (onBeforeCompile) onBeforeCompile(shader, renderer);