From c3eff75eea12acbc1384b207bdc260592ae6db53 Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Mon, 24 Feb 2014 14:49:07 -0500
Subject: [PATCH] WebGLRenderer: Sort by material.id first.

---
 examples/webgl_sandbox.html    | 4 ----
 src/renderers/WebGLRenderer.js | 8 +++++++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/examples/webgl_sandbox.html b/examples/webgl_sandbox.html
index 81b605aa1d..d14a2468dd 100644
--- a/examples/webgl_sandbox.html
+++ b/examples/webgl_sandbox.html
@@ -132,16 +132,12 @@
 
 					mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 4 + 1;
 
-					mesh.matrixAutoUpdate = false;
-					mesh.updateMatrix();
 					scene.add( mesh );
 
 				}
 
 				renderer = new THREE.WebGLRenderer();
 				renderer.setSize( window.innerWidth, window.innerHeight );
-				renderer.sortObjects = false;
-
 				container.appendChild( renderer.domElement );
 
 				if ( statsEnabled ) {
diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 3643b137f5..6aa577b496 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -3180,7 +3180,11 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	function painterSortStable ( a, b ) {
 
-		if ( a.z !== b.z ) {
+		if ( a.materialId !== b.materialId ) {
+
+			return b.materialId - a.materialId;
+
+		} else if ( a.z !== b.z ) {
 
 			return b.z - a.z;
 
@@ -3269,6 +3273,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 			object = webglObject.object;
 
 			webglObject.id = i;
+			webglObject.materialId = object.material.id;
 			webglObject.render = false;
 
 			if ( object.visible ) {
@@ -3811,6 +3816,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 				id: null,
 				buffer: buffer,
 				object: object,
+				materialId: null,
 				opaque: null,
 				transparent: null,
 				z: 0
-- 
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