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Agree Re: Dichroic mirror implementation and a general OpticalSurface question. 

Forum: Processes Involving Optical Photons
Re: Question Dichroic mirror implementation and a general OpticalSurface question. (Aleksey Sher)
Re: Feedback Re: Dichroic mirror implementation and a general OpticalSurface question. (Aleksey Sher)
Date: 20 Mar, 2018
From: Michael H. Kelsey <Michael H. Kelsey>

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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1 Ok: Re: Dichroic mirror implementation and a general OpticalSurface question.   (Aleksey Sher - 21 Mar, 2018)
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