|Message: GDML and Optical Photons||Not Logged In (login)|
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I have successfully imported, from a 3D modeling CAD, a complex geometry description and added optical properties to it within Geant4.
I am currently having problems during optical simulations, when the volume in use is imported and described as a tessellated volume in a GDML file there are incorrect reflections at boundaries. What happens is that Optical Photons only bounce once correctly on the inner surface of a closed tube, on the second interaction with the border the photon always escape.
To test problem I have made a simple test: I made the same geometry description in geant4 with G4Tube and with the CAD (and then imported into geant4). I get the expected results with only the G4Tube, the imported volume always has optical boundaries problem. To make the test simpler I am currently only using the optical boundary process, and defining refractive indexes into the material description.
I add an a image of typical optical event. Due the refractive indexes the ray should not escape in neither case. The first image is from the tessellated solid, and the second one is a G4Tube.
Just ask if more information is needed.
Thanks in advance for any help or advice.
SiLab UTFSM, Chile.