|Message: Re: Dichroic mirror implementation and a general OpticalSurface question.||Not Logged In (login)|
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On Tue, 20 Mar 2018 23:23:07 GMT, Aleksey Sher wrote:
> It seems to be the case. That is indeed, as expected, every time the optical photon crosses the surface > (defined as a skinsurface). So in this case, use of the bordersurface would be more appropriate I assume. > And that bordersurface could define just one side of the G4Box. That way the optical photon would cross > it only once, and either will be transmitted or reflected.
That's correct. The SkinSurface is attached to a single logical volume. It applies equally to tracks reaching it from either direction (there is a convention for inbound vs. outbound, but I don't recall the details). The BorderSurface is defined for a pair of specific, adjacent physical volumes.
Note that if you have a complex geometry built by multiple classes, setting up a BorderSurface can be complex, because you may not have the PVs in hand at the point in your code where you would "naturally" do the surface definitions.
-- Michael Kelsey
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