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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)
Re: More Re: Same two steps repeat again and again (Ioannis Sechopoulos)
Date: 02 Sep, 2009
From: Gabriele Cosmo <Gabriele Cosmo>

Hi Ioannis,

thanks for the additional info.

> 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.

The fact that the navigator reports about stuck tracks with zero step may
well be correlated to the problem you see afterwards and indicates likely a
real problem in the geometry setup.
The fact you do not happen to see it in 8.3.p02 does not mean the problem
isn't already there; you're migrating out of three releases, including a major one,
it is not surprising if you see behavioral changes.
We need to verify if there is anything wrong in your geometry setup (I see
you're using a relatively complex composition of Boolean solids, which is
where apparently the problem happens...).
Let's discuss this offline.

Cheers, Gabriele

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1 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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