Union is missing

[JanWerder]

Union is not implemented if I'm correct, but it is advertised in the ReadMe. Is there a simple way to activate it?

[fogleman]

In the context of this library, you can just render each object to get the same effect as a Union. (The CSG operations in ln don't actually compute a new geometry)

[JanWerder]

But if I would render both objects I would still have the putlines of both.