ColladaLoader: Removed usage of alpha maps.

examples/js/loaders/ColladaLoader.js

@@ -1574,7 +1574,8 @@ THREE.ColladaLoader.prototype = {
 
 				if ( transparent.data.texture ) {
 
-					material.alphaMap = getTexture( transparent.data.texture );
+					// we do not set an alpha map (see #13792)
+
 					material.transparent = true;
 
 				} else {