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Forum: Processes Involving Optical Photons
Re: Question Logical Border Surface - How to use logical volume vs physical? (Scott Dow)
Re: Idea Re: Logical Border Surface - How to use logical volume vs physical? (Michael H. Kelsey)
Re: Question Re: Logical Border Surface - How to use logical volume vs physical? (Scott Dow)
Date: 24 Oct, 2017
From: Michael H. Kelsey <Michael H. Kelsey>

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

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