void setPlaneParameters(Point4f plane) {
		if (plane.x + plane.y + plane.z == 0)
			plane.z = 1; // {0 0 0 w} becomes {0 0 1 w}
		thePlaneNormal.set(plane.x, plane.y, plane.z);
		thePlaneNormalMag = thePlaneNormal.length();
	}