int getContourType(Point4f plane) {
		Vector3f norm = new Vector3f(plane.x, plane.y, plane.z);
		float dotX = norm.dot(volumetricVectors[0]);
		float dotY = norm.dot(volumetricVectors[1]);
		float dotZ = norm.dot(volumetricVectors[2]);
		dotX *= dotX;
		dotY *= dotY;
		dotZ *= dotZ;
		float max = dotX;
		if (max < dotY)
			max = dotY;
		int iType = (max < dotZ ? 2 : max == dotY ? 1 : 0);
		Logger.info("contouring planar pixel subset " + iType);
		return iType;
	}