Hi guys,
        for (var i = 0; i < meshInstances.length - 1; i++) {
            meshInstances[i].material = meshInstances[i].material.clone();
            this._materials[i] = meshInstances[i].material;
            meshInstances[i].material.update();
        }
cloning material now throw errors : Uncaught TypeError: this[pname].clone is not a function.
Thank you