code: function( theta, contrast ){
              this.contrast = typeof contrast === 'number' ? contrast : 0.25;
              this.theta = MathUtils.radians( typeof theta === 'number' ? theta : 10 );
          }
docs: Creates a new instance
  @param {Number} [theta] optionally provide an angle in degrees, defaults to 10
  @param {Number} [contrast] optionally provide a contrast, defaults to 0.25