projectPoint( point, target ) {

		return target.copy( point ).addScaledVector( this.normal, - this.distanceToPoint( point ) );

	}
Projects a the given point onto the plane.

@param {Vector3} point - The point to project.
@param {Vector3} target - The target vector that is used to store the method's result.
@return {Vector3} The projected point on the plane.