three.js/src/objects/Particle.js

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

THREE.Particle = function ( materials ) {

	THREE.Object3D.call( this );

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

};

THREE.Particle.prototype = new THREE.Object3D();
THREE.Particle.prototype.constructor = THREE.Particle;