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Question G4Navigator::ComputeStep() warning 

Forum: Event and Track Management
Date: 03 Feb, 2012
From: <Santos>

Hi all,

I have to return to the topic that I found in several posts, but no solution working for me was there

An example of what I get from the navigator:

WARNING - G4Navigator::ComputeStep()
          Track stuck, not moving for 10 steps
          in volume -targholder- at point (52.0154,-10.1686,-7.29441)
          direction: (0.859796,-0.414921,-0.297642).
          Potential geometry or navigation problem !
          Trying pushing it of 1e-07 mm ...

And I get this so often that it seriously slow the program (by the way theNavigator->SetVerbosity(0) does not get rid of it - ?!)

My detector setup is as simple as they get: experimental hall -- box with 20cm half-side. A targetholder (Al) inside: a cylinder with half-height and radius of 53 mm, and target (high-pressure He) with half-height and radius of 50 mm inside. I get these warnings either if I make target a daughter of the target holder or if I make target holder hollow and make target directly a daughter of the hall. I send neutron along the x-axis.

/geometry/test/recursive_test is successful. No constants that could be inaccurate -- I am referring to one of the old suggestions that, e.g., using 1.41 instead of sqrt(2.) can cause this. Speaking of the latter, I also tried using boxes for the target and the holder -- does not help.

Do you have any suggestions how to avoid these warnings? What might geant no like? And, in the extreme case, how do I simple suppress them?

About the latter one, I tried:

     G4Navigator* theNavigator = G4TransportationManager::GetTransportationManager()->GetNavigatorForTracking();

but to no avail.

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1 Note: Re: G4Navigator::ComputeStep() warning   (Santos - 03 Feb, 2012)
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to: "G4Navigator::ComputeStep() warning"

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