Thank you! It has been a long day and I must confess I did not notice the 
different comments in the cubic spline section. I should have paid more 
attention.

Even though I use PovRay for more than a decade or so I never needed a prism 
with cubic_spline option. I find splines hard to control, so I never used 
them until now.

>> I am pretty sure this is not a bug in PovRay,
> So you are pretty sure that your posting is off-topic here, and should 
> have been posted to e.g. povray.general instead? Okay...

I feel properly chasticed... mea culpa, mea maxima culpa... 



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