Fixed webgl_materials_cubemap example. See #6839.

examples/webgl_materials_cubemap.html

@@ -108,8 +108,8 @@
 				var reflectionCube = THREE.ImageUtils.loadTextureCube( urls );
 				reflectionCube.format = THREE.RGBFormat;
 
-				var refractionCube = new THREE.CubeTexture( reflectionCube.image, THREE.CubeRefractionMapping );
-				refractionCube.format = THREE.RGBFormat;
+				var refractionCube = THREE.ImageUtils.loadTextureCube( urls );
+				refractionCube.mapping = THREE.CubeRefractionMapping;
 
 				//var cubeMaterial3 = new THREE.MeshPhongMaterial( { color: 0x000000, specular:0xaa0000, envMap: reflectionCube, combine: THREE.MixOperation, reflectivity: 0.25 } );
 				var cubeMaterial3 = new THREE.MeshLambertMaterial( { color: 0xff6600, envMap: reflectionCube, combine: THREE.MixOperation, reflectivity: 0.3 } );