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Question Surface normal is not unit error 

Forum: Geometry
Date: 16 Sep, 2014
From: Phil Jones <Phil Jones>

Hello,

I am seeing tracking exceptions of the form

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : GeomNav0003
      issued by : G4Navigator::GetLocalExitNormal()
...
Surface Normal returned by Solid is not a Unit Vector
*** Fatal Exception *** core dump ***
-------- EEEE -------- G4Exception-END --------- EEEE -------

with geant4.10.00.p02 and geant4.9.6 for a boolean collection of standard (CSG) solids. Any suggestions on how to fix this?

I've ran the geant4 overlap checks for the geometry and found no errors there, I also ran the recursive check in 4.9.6 and found no errors there.

Thanks Phil

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