Thorsten Froehlich wrote:
> as a merge object in the first place.  There is no correct inversion of a
> union object that is not a merge 

Yep, that's exactly the point. I did not mean to claim that there is 
anything wrong with POV-Ray. It is just something I came across while 
implementing CSG for my own little ray-tracer.

> so POV-Ray changes it for you
> automatically. So inverting has a side effect in this case, yes (and maybe
> a warning might be a good idea for this), but is changes nothing about the
> optimal handling of "inverse", that is multiple-inversions will not add
> any otherhead, which is the answer to the initial question you asked...

That was Warp's question not mine. I just wanted to point out that 
double-inversing does sometimes do something one would not expect at the 
first moment.

- Micha

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