"Kima" <nomail@nomail> wrote:
> The macro given at http://www.slimeland.com/misc/roundedprism.inc is very handy
> for building a rounded prism. However, I cannot create any rounded prism if the
> object has a void within like
> https://www.povray.org/documentation/images/tutorial/subshape.png
>
> How can I create a rounded prism for an object like
>
> prism {
>     linear_sweep
>     cubic_spline
>     0,  // sweep the following shape from here ...
>     1,  // ... up through here
>     18, // the number of points making up the shape ...
>     <3,-5>, <3,5>, <-5,0>, <3, -5>, <3,5>, <-5,0>,//sub-shape #1
>     <2,-4>, <2,4>, <-4,0>, <2,-4>, <2,4>, <-4,0>, //sub-shape #2
>     <1,-3>, <1,3>, <-3,0>, <1, -3>, <1,3>, <-3,0> //sub-shape #3
>     pigment { Green }
>   }

The incredible Sam Benge provided his Rounded Linear Prism macros back in 2010.
You can find them in the POV-Ray Object Collection - in the Resources section of
Home, same place as these newsgroups.

Don't know if you have seen these and rejected them, but you don't mention them.
The example he gives is a P. I think that is what you mean by void.

If you search on rounded prism and wade through a few results you will get to
the posts. Sam called them the rlp macros.

They took only straight lines and circular arcs, but this turned out to be less
of a restriction than you might think, given that sharp corners, that is corners
from line segment to line line segment rather than line segment to circular arc,
could be rounded.

JimT

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