> P.S: Does anyone have any tool recommendations for modelling with bicubic
> patches? Writing them by hand is rather tedious and I haven't found anything yet
> that fits the bill!

I only know of very old Windows programs for this purpose. Years ago, I 
played a bit with sPatch but abandoned it soon. So I can give you the 
links here only.

Mike Clifton's official sPatch website has been down for years, and 
there's nothing of substance on archive.org either. However, a copy can 
still be downloaded under the link

https://www.eatonhand.com/images/spatch.htm

You should find a subdirectory "docs" with a short manual.

 From the list

https://wiki.povray.org/content/Knowledgebase:POV-Ray_Modelling_Programs

an exe-File of the Bicubic Patch Modeller can be found at archive.org

http://www.geocities.co.jp/HeartLand-Gaien/4415/bc31.lzh

and the HamaPatch-Link is still online. Both programs seems to be from 
Japan and can be made to run after a little resistance from Windows 
Defender. However, I have not yet been able to find any instructions on 
how to use the programs.

Best regards
Michael

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