Make sure vertex normals are cloned

examples/js/loaders/ColladaLoader.js

@@ -3024,9 +3024,9 @@ THREE.ColladaLoader = function () {
 
 				} else if ( vcount === 4 ) {
 
-					faces.push( new THREE.Face3( vs[0], vs[1], vs[3], [ns[0], ns[1], ns[3]], cs.length ? [cs[0], cs[1], cs[3]] : new THREE.Color() ) );
+					faces.push( new THREE.Face3( vs[0], vs[1], vs[3], [ns[0].clone(), ns[1].clone(), ns[3].clone()], cs.length ? [cs[0], cs[1], cs[3]] : new THREE.Color() ) );
 
-					faces.push( new THREE.Face3( vs[1], vs[2], vs[3], [ns[1], ns[2], ns[3]], cs.length ? [cs[1], cs[2], cs[3]] : new THREE.Color() ) );
+					faces.push( new THREE.Face3( vs[1], vs[2], vs[3], [ns[1].clone(), ns[2].clone(), ns[3].clone()], cs.length ? [cs[1], cs[2], cs[3]] : new THREE.Color() ) );
 
 				} else if ( vcount > 4 && options.subdivideFaces ) {
 
@@ -3039,7 +3039,7 @@ THREE.ColladaLoader = function () {
 
 						// FIXME: normals don't seem to be quite right
 
-						faces.push( new THREE.Face3( vs[0], vs[k], vs[k+1], [ ns[0], ns[k++], ns[k] ],  clr ) );
+						faces.push( new THREE.Face3( vs[0], vs[k], vs[k+1], [ ns[0].clone(), ns[k++].clone(), ns[k].clone() ],  clr ) );
 
 					}