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Forum: Geometry
Re: Question Photon Not Moving
Re: More Re: Photon Not Moving (Gabriele Cosmo)
Re: None Re: Photon Not Moving (Andrzej Szelc)
Date: 09 Dec, 2011
From: Michael Douglass <Michael Douglass>

On Thu, 08 Dec 2011 22:52:40 GMT, Andrzej Szelc wrote:
> Hi, I have an identical problem where photons at very different energies
> seem to stop with a ~e-14 stepsize well inside the .gdml defined volume.
> It does seem that they stop on the boundary of voxels and if I dig in to
> the geant4 part of the code ( it turns
> out that fOnBoundary=true . I have seen it happen several times, and I'm
> able to reproduce it consistently reusing the random seeds. I don't
> think I can supply a cut down version that would reproduce this
> elsewhere, though.
> Michael, were you able to find a solution to this? Is there some way to
> catch these events and force them to have a bigger step inside the user
> action code? thanks, Andrzej

Hi Andrzej,

It's been a while since I've had that problem. It's difficult to know what caused it. I think the problem stopped when I started using the physics list from the brachytherapy example


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