> 
> > Scattering media should be fine for that, no problem with meshes as long
> > as they are closed of course.  If you need it on a singular mesh surface
> > you will have to 'double' it to get a closed volume.
> 
> That is what I want to avoid. 

That would be difficult.  Or have you ever seen a milky glass of zero
thickness?

> I already have several hunderts of thouthands
> triangles. I don't want to double them (or almost triple to close it
> properly)

It would not be much slower, meshes are very efficient concerning higher
triangle counts.

Christoph

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