From b000372cc424fa46c1b7ebb1f5f20e2396f1ce83 Mon Sep 17 00:00:00 2001
From: Don McCurdy <don.r.mccurdy@gmail.com>
Date: Mon, 9 Oct 2017 18:35:45 -0700
Subject: [PATCH] GLTFLoader: Keep uvScaleMap updates backwards-compatible.

---
 examples/js/loaders/GLTFLoader.js | 34 +++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/examples/js/loaders/GLTFLoader.js b/examples/js/loaders/GLTFLoader.js
index a014837564..ea37082f2b 100644
--- a/examples/js/loaders/GLTFLoader.js
+++ b/examples/js/loaders/GLTFLoader.js
@@ -760,18 +760,36 @@ THREE.GLTFLoader = ( function () {
 
 					}
 
-					if ( uvScaleMap.matrixAutoUpdate === true ) {
+					var offset;
+					var repeat;
 
-						var offset = uvScaleMap.offset;
-						var repeat = uvScaleMap.repeat;
-						var rotation = uvScaleMap.rotation;
-						var center = uvScaleMap.center;
+					if ( uvScaleMap.matrix !== undefined ) {
 
-						uvScaleMap.matrix.setUvTransform( offset.x, offset.y, repeat.x, repeat.y, rotation, center.x, center.y );
+						// > r88.
 
-					}
+						if ( uvScaleMap.matrixAutoUpdate === true ) {
+
+							offset = uvScaleMap.offset;
+							repeat = uvScaleMap.repeat;
+							var rotation = uvScaleMap.rotation;
+							var center = uvScaleMap.center;
+
+							uvScaleMap.matrix.setUvTransform( offset.x, offset.y, repeat.x, repeat.y, rotation, center.x, center.y );
+
+						}
+
+						uniforms.uvTransform.value.copy( uvScaleMap.matrix );
 
-					uniforms.uvTransform.value.copy( uvScaleMap.matrix );
+					} else {
+
+							// <= r87. Remove when reasonable.
+
+							offset = uvScaleMap.offset;
+							repeat = uvScaleMap.repeat;
+
+							uniforms.offsetRepeat.value.set( offset.x, offset.y, repeat.x, repeat.y );
+
+					}
 
 				}
 
-- 
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