Warp <war### [at] tagpovrayorg> wrote:
> MichaelJF <mi-### [at] t-onlinede> wrote:
> > Ah, yes, you are right. But as I understand it so far, open meshes are a
> > problem even with a proper inside_vector.
>
> How so? I don't think there are any more of a problem as eg. heightfields.
>

With a standard HF, an inside_vector of <0,-1,0> (or maybe <0,1,0>) would always
work, AFAIU. But for, say, a spherical mesh with a hole in it--i.e., not a
closed mesh-- a specially-chosen inside_vector may work *most* of the time, but
perhaps not always. I think it depends on the location of the CSG object--where
it happens to intersect the mesh.  I've run into that problem myself.

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