How to suppress all warning messages in Geant4?

Geometry, Fields and Transportation
#1

Dear all,

I want to force my simulation to stop generating (or showing) lots of warning messages. I have tried the following to set the verbosity to 0, but it did not work:

/control/verbose 0
/run/verbose 0
/event/verbose 0
/tracking/verbose 0
/hits/verbose 0
/run/particle/verbose 0
/geometry/navigator/verbose 0

How can I set all verbosity to zero so that I can speed up my simulation a little bit? In my case, the warning messages I am getting are just warning, and it is safe to ignore them. See below for the type of warning that I want to suppress:

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1002
issued by : G4Navigator::ComputeStep()
Stuck Track: potential geometry or navigation problem.
Track stuck, not moving for 10 steps.
Current phys volume: ‘world_phys’

  • at position : (-232.1458026419418,257.3936389169146,2.313385798282503)
    in direction: (0.4717506325580638,-0.8364464362708558,0.2789421085652931)
    (local position: (-232.1458026419418,257.3936389169146,2.313385798282503))
    (local direction: (0.4717506325580638,-0.8364464362708558,0.2789421085652931)).
    Previous phys volume: ‘body_phys’

Likely geometry overlap - else navigation problem !
*** Trying to get unstuck using a push - expanding step to 1e-07 (mm) … Potential overlap in geometry !

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1002
issued by : G4Navigator::ComputeStep()
Stuck Track: potential geometry or navigation problem.
Track stuck, not moving for 10 steps.
Current phys volume: ‘body_phys’

  • at position : (-218.4109607217677,305.7984695081289,-54.07777062925668)
    in direction: (0.8654973824996588,0.1218692841277543,-0.4858622834429813)
    (local position: (-218.4109607217677,54.0777706292567,305.7984695081289))
    (local direction: (0.8654973824996588,0.4858622834429813,0.1218692841277543)).
    Previous phys volume: ‘bone_phys’

Likely geometry overlap - else navigation problem !
*** Trying to get unstuck using a push - expanding step to 1e-07 (mm) … Potential overlap in geometry !

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

I appreciate your help in advance.

Regards,
Ashok

#2

Hello,

Best way to supress these warnings is to fix the cause.

Seems like there is something wrong with the geometry. How are ‘world_phys’ and ‘body_phys’ connected to each other? Is ‘world_phys’ a mother volume of ‘body_phys’?

Regards
Max

1 Like
#3

Hi Max,

Yes, the body is the daughter of the mother volume “world”. I have checked with visualization that they are not overlapped with each other, although the body daughter volume has some defects as it is imported from the CAD program. I think it is safe to ignore this warning in my simulations, and if I manage to suppress these warnings, this will speed up my simulations by some factor as printing these warning messages takes some time. So, I am looking for a command to suppress these sorts of warning messages.

#4

That warning can be suppressed by compiling Geant4 itself with the CMake option GEANT4_BUILD_VERBOSE_CODE set to OFF. That will however suppress not just that specific warning, but many others as well.

I’ve moved this to geometry as I think the better solution is to address why tracks are getting stuck in this geometry and fix that, and the experts here can help with this.

1 Like
#5

absolutely not true :slight_smile:

#6

Hi weller,

I did not mean all the CAD imported geometries or volumes have defects, that’s not true, but my simulation geometry has.

#7

yeah, I just wanted to tease a little…

If these warnings slow down your simulation notably, I would fear that already a not insignificant portion of the events is indeed affected by the defective geometry.

have you tried if /geometry/test/run gives you a meaningful error message?
otherwise, I would open the CAD-export in a suitable program and check for common errors (degenerate or inside-out faces, holes, self-intersections, duplicate vertices, non-triangles/quads…).

#8

I did try that command to check my geometry. No overlap was detected. I managed to speed up my simulations by a factor of ~1.5 times by reducing the poly mesh in my CAD/STL geometry (ReduceMesh by 50%), but still, the Geant4 is writing warning messages. If I able to suppress those warnings, as I mentioned before, I could get more gain. And I don’t want to be aggressive in reducing my mesh triangles as it may backfire!

#9

the problem is probably not the number of facets, it is defects. particles do not get trapped in a valid geometry.

what benefit do you get from speed-up, if you cannot trust the results?