On 3/25/20 8:05 AM, William F Pokorny wrote:
...
> 
> I've got a little buzzer going off that somewhere in the last few years 
> Christoph responded to someone hitting a particular hollow issue with it 
> propagating or not as desired. I'll try and find that post.
> 

On my initial search I couldn't find anything, but just now, while 
creating a list of github issues and pull requests my cut down POV-Ray 
addresses or fixes, I ran across:

object hierarchy changes hollow set flag #307

  https://github.com/POV-Ray/povray/issues/307

For reference. Looks like whether and how hollow works or not is change 
v36 to v37 and complicated. Avoiding propagation through CSG still seems 
to me the safest bet.

Bill P.

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