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Forum: Geometry
Re: None G4Navigator Exception with parallel world
Date: 27 Jun, 2016
From: Eric Simiele <Eric Simiele>

The issue you encountered is common problem that can happen in Monte Carlo codes when the geometry is defined too fine. Typically, the cause is roundoff errors in placement of the geometry so when a particle is being tracked it may enter a region where two volumes are overlapping by a very small amount (~1e-7 or so). In this region, the code gets confused about which logical volume the particle is in so the end effect is that the particle doesn't go anywhere (because the code doesn't know which cross sections to sample). You could try redefining your geometry to try and minimize any touching geometries. Sometimes the issue can be fixed by something as simple as changing the random number seed.

Hope this helps.

Eric

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