constructor(parameters) {
			super();
			this.type = 'SpriteMaterial';
			this.color = new Color(0xffffff);
			this.map = null;
			this.alphaMap = null;
			this.rotation = 0;
			this.sizeAttenuation = true;
			this.transparent = true;
			this.setValues(parameters);
		}
parameters = {
	color: <hex>,
	map: new THREE.Texture( <Image> ),
	alphaMap: new THREE.Texture( <Image> ),
	rotation: <float>,
	sizeAttenuation: <bool>
}