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> As I already understood by not > defining any LogicalBorderSurface, a polished, dielectric-dielectric > border is assumed by default! Should then not reflection happen at this > point?
Only internal reflection happens according to Snell's Law on a polished dielectric-dielectric surface, else the photon refracts out. Of course, you need to give your volume 3's material an index of refraction for Snell's Law to be evaluated.
> But what I would like to have is internal reflection at one > single polished surface (while all others are coarse surfaces of the > rectangular solid) without the need of transmission through a ground > surface before. I'm not sure, if by defining a third volume I simulate > the case of a rectangular solid with one single polished side?!
I tried to explain in my previous posting that the G4LogicalBorderSurface (your ground surface) kicks in only when the photon will exit into vol2 and the combination of vol1/vol2 is found among the list of G4LogicalBorderSurfaces in the corresponding table. I understood that your vol3 will butt against vol1 only at one side of the rectangular solid (vol1). All other sides have a volume combination vol1/vol2 for which you have defined a rough surface.
> I hope you understand my special case!
Well, I am not so sure anymore, but I think I do, and yours is not really such a special case.
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