function ShadowMaterial( parameters ) {

		Material.call( this );

		this.type = 'ShadowMaterial';

		this.color = new Color( 0x000000 );
		this.opacity = 1.0;

		this.lights = true;
		this.transparent = true;

		this.setValues( parameters );

	}
@author mrdoob / http://mrdoob.com/

parameters = {
 color: <THREE.Color>,
 opacity: <float>
}