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 }
  }

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"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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"JimT" <nomail@nomail> wrote:
> "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

Thanks very much. When you mentioned "P", I just recalled that I've already seen
it. Funny enough, I didn't need to search for it as I could find it on my
computer. So silly of me.

Anyhow, you saved me from re-inventing the wheel.

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