|Message: Re: Stuck on error with optical photons||Not Logged In (login)|
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On second thought, it could also be that the direction of a photon after the G4OpBoundaryProcess, i.e. after refraction or reflection becomes nan. In that case, the debug printout I just suggested won't help. It's possible that the normal to a surface is wacky. Any chance that you can isolate the event and the track and print its step history.
You can also check NewMomentum for nan in G4OpBoundaryProcess::DoIt just before:
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