On 4/21/21 9:27 AM, s.day wrote:
> OK, it has been a long time since I have used POV for anything but have I
> forgotten a rule about using sphere_sweeps with CSG operations?
> 
> Below code has exactly the same sphere_sweep but when viewed at the lower angle
> I see artifacts:
> 

I'm not aware of any rule.

The scene renders fine with the current v3.8 master branch.

You don't have a cubic sweep, but I think you are very likely(1) hitting 
a closed(fixed) issue for a problem Yadgar reported and Christoph fixed 
back in 2017.

https://github.com/POV-Ray/povray/issues/287

(1) - I don't have a compile handy at the fix commit to 100% confirm it. 
In any case, the current v3.8 is OK.

Bill P.

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