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Question Particle Problems at G4TessellatedSolid Boundary 

Forum: Geometry
Date: 19 Feb, 2013
From: Alex Leatherland <Alex Leatherland>

G4TessellatedSolid is still creating problems in geant4.9.5.p02.

I created the same effective volume arrangement (one 10mm cube in the world) with with two different approaches. 1) G4Tessellated solid using 12 triangluar facets with extent +/- 5mm, each vertex for defining facets used the boxes corners. 2) G4Box solid with halfX halfY and halfZ of 5mm Besides the World volume, no other volumes were used.

For Case (2) a particle will encounter both sides of the box as it is supposed to.

For Case (1) the first boundary seems to have been missed, no matter the starting angle. The following G4Exception is reported for particles originating from -X travelling +dX:

-------- WWWW ------- GException-START -------- WWWW ------- 
*** G4Exception : GeomNav1002
      isued by : G4Navigator::ComputeStep()
Track stuck or not moving
          Track stuck, not moving for 10 steps
          in volume -World_PV- at point (5,0,0)
          direction: (1,0,0).
          Potential geometry or navigation problem!
          Trying pushing it of 1e-07 mm ...Potential overlap in geometry!

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

For other directions of travel the same error is listed with corespondingly different "at point (....)"

Is there a fix available for correcting G4TesselatedSolid?

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1 None: Re: Particle Problems at G4TessellatedSolid Boundary   (Ivana Hrivnacova - 19 Feb, 2013)
(_ None: Re: Particle Problems at G4TessellatedSolid Boundary   (Alex Leatherland - 20 Feb, 2013)
(_ None: Re: Particle Problems at G4TessellatedSolid Boundary   (Alex Leatherland - 20 Feb, 2013)
(_ None: Re: Particle Problems at G4TessellatedSolid Boundary   (Ivana Hrivnacova - 20 Feb, 2013)
(_ None: Re: Particle Problems at G4TessellatedSolid Boundary   (Alex Leatherland - 21 Feb, 2013)
(_ News: Re: Particle Problems at G4TessellatedSolid Boundary   (Alex Leatherland - 22 Feb, 2013)
(_ None: Re: Particle Problems at G4TessellatedSolid Boundary   (Ivana Hrivnacova - 27 Feb, 2013)
(_ None: Re: Particle Problems at G4TessellatedSolid Boundary   (Michael H. Kelsey - 27 Feb, 2013)
(_ Ok: Re: Particle Problems at G4TessellatedSolid Boundary   (Alex Leatherland - 07 Mar, 2013)
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