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Forum: Event and Track Management
Re: Question Same two steps repeat again and again (Ioannis Sechopoulos)
Re: Question Re: Same two steps repeat again and again (Gabriele Cosmo)
Re: Question Re: Same two steps repeat again and again (Ioannis Sechopoulos)
Re: More Re: Same two steps repeat again and again (Gabriele Cosmo)
Date: 01 Sep, 2009
From: Ioannis Sechopoulos <Ioannis Sechopoulos>

Gabriele,

I downloaded and compiled geant4 8.3 patch 02 and tried my program with it. With the same exact parameters and the same random seeds the program completes fine. Trying again with version 9.2 patch 02 (as a sanity check) it goes into the infinite stepping I posted earlier. One thing I neglected to mention is that I get a few of the following with 9.2 patch 02:

WARNING - G4Navigator::ComputeStep()
          Track stuck, not moving for 10 steps
          in volume -physiSkin- at point (109.9507309,-172.3171108,29.08821494)
          direction: (-0.5490483281,0.5267738563,-0.6488876927).
          Potential geometry or navigation problem !
          Trying pushing it of 9e-10 mm ...

before it gets completely stuck. I get one of these every some tens or hundreds of events. How many of the above I get before it gets stuck completely varies with the simulation parameters.

Let me know if there is something else I should try to help figure out what is wrong.

Thanks, Ioannis

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1 More: Re: Same two steps repeat again and again   (Gabriele Cosmo - 02 Sep, 2009)
(_ None: Re: Same two steps repeat again and again   (Robert Penny - 30 Sep, 2009)
(_ More: Re: Same two steps repeat again and again   (Gabriele Cosmo - 30 Sep, 2009)
(_ Question: Re: Same two steps repeat again and again   (Ron Mathis - 02 Oct, 2009)
(_ Feedback: Re: Same two steps repeat again and again   (Gabriele Cosmo - 05 Oct, 2009)
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