int secondX = conf.getInt(confbase + ".b.x", 0);
int secondY = conf.getInt(confbase + ".b.y", 0);
int secondZ = conf.getInt(confbase + ".b.z", 0);
if (firstX == 0 && firstY == 0 && firstZ == 0 && secondX == 0 && secondY == 0 && secondZ == 0) return null;
// create cube
return new CuboidImpl(firstWorld, (firstX<secondX?firstX:secondX), (firstY<secondY?firstY:secondY), (firstZ<secondZ?firstZ:secondZ),
(firstX>secondX?firstX:secondX), (firstY>secondY?firstY:secondY), (firstZ>secondZ?firstZ:secondZ));
}
}