kishalmi

	/**
	 * split a (loaded) model into mesh parts by material index
	 * @param {THREE.Geometry} geometry
	 * @param {Array<THREE.Material>} materials
	 * @returns {Array<THREE.Mesh>}
	 */
	var splitByMaterial = function(geometry,materials) {
		var parts = [],
			geo, vMap, iMat,
			addPart = function() {