Due to recent discussions in the pov4 forum, I decided to document what 
I believe are issues with disc{} shape's CSG results. Ref:

https://news.povray.org/povray.pov4.discussion.general/thread/%3C68c8a619%241%40news.povray.org%3E/

See the attached image and scene files.

The top row a disc{} is being intersected with a sphere{}. In the second 
row a roughly equivalent polygon{} is intersected in the same fashion.

I believe the disc{} results are correct only in the second and last 
columns. The polygon row of intersections I believe is OK(*).

Bill P.

(*) Image results use v3.8 beta 2. The normal in yuqk for the polygon{} 
is flipped so +z is the outside texture.

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Attachments:
Download 'discoddnesscsg_v38.png' (52 KB) Download 'discoddnesscsg.pov.txt' (4 KB)

Preview of image 'discoddnesscsg_v38.png'