[Gate-users] Overlap error in STL volumes that do not overlap

[Andreas Tefre Samnøy]

Hi
I am using STL files in my simulations because I have some complex
geometries that I had difficulties implementing normally in Gate. But when
I run the simulations I keep get these warning messages:

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1002
      issued by : G4Navigator::ComputeStep()
Track stuck or not moving.
          Track stuck, not moving for 10 steps
          in volume -topLayer_phys- at point (0.588,1.03676,-14.0003)
(local point (0.0129999,0.0117642,0.00165308))
          direction: (-0.0331223,0.030402,-0.998989) (local direction:
(-0.0331223,0.030402,-0.998989)).
          Potential geometry or navigation problem !
          Trying pushing it of 1e-07 mm ...Potential overlap in geometry!

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

I have visually inspected my volumes thoroughly, and there is no overlap
between volumes. All daughter volumes are within their mother volumes, and
no two daughter volumes overlap within the same mother. I have also run the
code below to find any overlaps, and this also says I do not have any
overlaps.

/geometry/test/tolerance 0.000001     # 1nm
/geometry/test/maximum_errors 10
/geometry/test/resolution 1000000
/geometry/test/run

I have attached images of three different STL volumes that all give the
same warning.
The coordinate of the warning seems to always come from the edge of the STL
volume.


Best Regards

Andreas Tefre Samnøy
Phd student
University of Bergen
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