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Forum: Processes Involving Optical Photons
Re: Question Refractive indices of painting materials (Akira Okumura)
Re: Feedback Re: Refractive indices of painting materials (Gumplinger Peter)
Re: Question Re: Refractive indices of painting materials (Akira Okumura)
Date: 03 Feb, 2010
From: Gumplinger Peter <Gumplinger Peter>

> Then how can I implement a grind scintillator block wrapped with specular

> material sheet?

I am afraid this combination of "ground" dielectric_dielectric and specular ("polished") reflector is only possible if you actually implement the geometry with the gap and two surfaces scintillator/gap and gap/reflector (dielectric_metal).

However, if you have access to the G4 source, by modifying only one line, you can change the behaviour of 'groundbackpainted' to do what you want. Comment out:

http://www-geant4.kek.jp/lxr/source/processes/optical/src/G4OpBoundaryProcess.cc#L990

Then the logic in DoReflection will choose 'specular' instead of Lambertian.

I should be thinking of another user option to choose the back-reflector property in 'backpainted'.

Peter

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