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

regards
SY

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