three.js/src/core/Face4.js

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

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

	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.material = material instanceof Array ? material : [ material ];

};


THREE.Face4.prototype = {

	toString: function () {

		return 'THREE.Face4 ( ' + this.a + ', ' + this.b + ', ' + this.c + ' ' + this.d + ' )';

	}

}