|Message: Re: How to define two different optical surfaces on each side of BGO slab!||Not Logged In (login)|
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At the moment, in order for you to have different optical properties for different sides of the same volume you'll need to define adjacent volumes in the simulation that butt up with the various sides. For example, if the top and bottom of a G4Box 'BGO' should have different optical surfaces than the four other sides, you can place the BGO into its 'mother', then place a volume, let's call it 'needed', adjacent to both the top and bottom sides of BGO with dimensions as large as the top/bottom face and some finite (but can be very small) thickness. It is now possible to define two border surfaces, one between BGO and 'mother' which applies to the four sides, and a second and third border surface between 'detector' and 'top needed' and 'bottom needed'. The 'needed' volume can be made of the same physical material as the mother. It is needed, however, because the constructor of G4LogicalBorderSurface requires two pointers to actual G4VPhysicalVolume(s). You can now define two G4OpticalSurface(s) one attached to the one G4LogicalBorderSurface and the other G4OpticalSurface associated with your second/third border surface.
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