/**
 * @author mr.doob / http://mrdoob.com/
 */

THREE.Face4 = function ( a, b, c, d, normal, materials ) {

	this.a = a;
	this.b = b;
	this.c = c;
	this.d = d;

	this.centroid = new THREE.Vector3();
	this.normal = normal instanceof THREE.Vector3 ? normal : new THREE.Vector3();
	this.vertexNormals = normal instanceof Array ? normal : [];

	this.materials = materials instanceof Array ? materials : [ materials ];

};