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None Invalid GetLocalExitNormal at "shared" boundaries 

Forum: Geometry
Date: 31 Oct, 2006
From: Giovanni Santin <Giovanni Santin>

Dear Geometry experts

I have a simple geometry made of a G4Box World containing 2 adjacent layers (also G4Box), layer0 and layer1.

 p     |  0  |  1  | 
 --->  | --- x --- | --->
       |     |     |

The boxes share one surface, so that protons shot with gps in World impinge on layer0, exit from layer0 at the other side and enter directly in layer1 without passing through the mother volume World.

Everything works fine if I just need to see in which volume the step is. I can also detect the boundary crossing between layer0 and layer1 by asking for the volume names at pre and post step points.

But if I ask for the normal via G4Navigator::GetLocalExitNormal, it always gives me an invalid normal at the boundary crossing 0->1.

To get the normal, I copied the code from G4OpBoundaryProcess.cc.

I had a look at the code of G4Navigator::GetLocalExitNormal, but I am not sure I understand it entirely:

can the problem simply be due to the shared surfaces and to the fact that the protons go from a volume (layer0) directly to another (layer1) at the same level in the volume tree without passing through the mother volume first?

Or should I look somewhere else for a solution?

Thanks in advance for your time,

Giovanni

 --
 Dr. Giovanni Santin
 Space Environments and Effects Analysis
 ESA / ESTEC / TEC-EES
 Tel: +31 (0)71 565 6267 , Fax: +31 (0)71 565 4999
 http://space-env.esa.int

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