> How can I create a prism with 'arcs'-sides?
I would suggest you read section 2.3.1 of the POV-Ray Documentation
which covers spline-based shapes, including splines in prisms. You
probably want to use a quadratic spline, if I have understood you
correctly. When you say an "arc", do you really mean an arc, which is
the shape of part of the circumference of a circle, or do you mean a
general curve? If it is an arc, then I think unioning a few cylinders
together would work very well if you can cope with the maths. If it is a
general curve, then I would recommend using a prism with a cubic spline.

Hope this helped,
Daniel

-- 
A most peculiar man    With the windows closed      And Mrs Reardon says
He died last Saturday  So he'd never wake up  He has a brother somewhere
He turned on the gas   To his silent world   Who should be notified soon
And he went to sleep   And his tiny room    .oO( http://sad.istic.org/ )

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