Material super clone appoach.

src/materials/Material.js

@@ -55,7 +55,7 @@ THREE.Material.prototype.setValues = function ( values ) {
 
 };
 
-THREE.Material.prototype.clone = function () {
+THREE.Material.prototype.clone = function ( material ) {
 
 	material.name = this.name;
 

src/materials/MeshBasicMaterial.js

@@ -69,6 +69,8 @@ THREE.MeshBasicMaterial.prototype.clone = function () {
 
 	var material = new THREE.MeshBasicMaterial();
 
+	THREE.Material.prototype.clone.call( this, material );
+
 	material.color.copy( this.color );
 
 	material.map = this.map;