On 1 Jun 2004 03:42:20 -0400, ingo <ing### [at] tagpovrayorg> wrote:
> |------\
> |_____  \
>       |  \
>       |   |
>    +  |   |
>       |   |
> ______|   /
> |        /
> |_______/
>
> This is the kind of situation Rune is referring to, I think.

I think the most difficoult problem is hole within prism (subshape):
   ________
  /        \
 /    /\    \
|    /  \    |
|    \  /    |
|     \/     |
 \    /\    /
  \__/  \__/

as in http://www.povray.org/documentation/view/50/#s03_04_03_03

ABX

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