|Message: Re: Change the properties of specific surfaces of a physical volume||Not Logged In (login)|
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> First, here I have some physical volume, for example a cube. Of course it has 6 surfaces. > I want to change a surface property of this cube, but only 2 surfaces of it. > Is it possible to change the properties of specific surfaces of a physical volume?
Yes, it is but only with a trick. What you need to do is place a different volume on the outside of the surfaces you want to be different. If you want 2 surfaces to be different from the other four, you need to place a different volume on the outside of each; e.g. two volumes. The volumes themselves can have the same physical properties as the outside and they can be very thin. This allows you to specify a specific G4LogicalBorderSurface to each of the two volumes and a different one to the other four surfaces.
> Somebody said that I can change the roughness of a surface using 'sigmaalpha', > or optical_surface->SetPolish(a number between 0 and 1), (0 means maximum roughness, 1 means perfect smoothness.)
> I think that, if I can select one surface of a volume, then I just can define optical surface, set finish as polished,
No, set finish to 'ground'.
> and set polish with some value between 0 and 1 to make that surface rough.
if (fSurfaceRoughness < 1.) opSurface = new G4OpticalSurface("RoughSurface", // Surface Name glisur, // SetModel ground, // SetFinish dielectric_dielectric, // SetType fSurfaceRoughness); // SetPolish
> (or if it is impossible to select surfaces,
Yes, it is impossible.
> should I attach some volume there and set border-boundary?- surface parameter between them?)
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