Alain <aze### [at] qwertyorg> wrote:

> >
> > Hi,
> > I need to ray trace a quadric (hyperbola or sphere) clipped by a prism with
> > arbitrary polygonal base or clipped by e tetraedron. The scene is composed by
> > several of these patches. What is the best method to do this?
> > I tried by triangulating the mesh of the prism but it seems that the mesh object
> > cannot be used inside a bounded_by or clipped_by statement.
> > Any suggestion?
> > Thanks,
> > Sergio
> >
> >
>
> You can use the prism or the tetraedron directly.
> It's the only way if you are using version 3.6.
>
> You can try to use the interior_vector on those meshes. (you need to use
> version 3.7 to have that feature)
>
> Normaly, a mesh is just an infinitely thin shell with no defined
> interior/exterior relationship.
> Bounded_by and clipped_by need a clear interior/exterior for the used
> object.
>
> Adding an interior_vector to your mesh enable that distinction.
> (need version 3.7)
>
>
>
>
> Alain

Using version 3.7 everything is fine.
Many thanks!
Sergio

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