|Message: Re: Logical Border Surface - How to use logical volume vs physical?||Not Logged In (login)|
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Scott Dow writes: > Thank you very much for the solid answer! Too bad this functionality > doesn't exist. I think it "could" exist, but it would be more complex and would likely slow down the simulation. Recall that a given logical volume can be used in an arbitrary number of placements, at essentially any level of the geometry hierarchy. Creating a "border surface" with two LVs as the keys means that you have to test at every boundary whether the two PVs involved have LVs which are those keys. > One more quick follow up question. If I were to use a > logical border surface with a dielectric_dielectric interface, a > polished finish, and the unified model, and no other specifications, > would this be the same as simply not using a logical border surface? That is definitely my understanding. So long as you attach the appropriate optical properties (RINDEX, etc.) to the materials of the two logical volumes, then G4OpBoundaryProcess will use dielectric_dielectric etc. at that boundary, with no explicit surface required. This doesn't work for metal surfaces or for any special scattering needs. -- Michael Kelsey