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Forum: Processes Involving Optical Photons
Re: Question Convergence to diffuse reflection (Charles Sosa)
Re: Question Re: Convergence to diffuse reflection (Charles Sosa)
Date: 20 Oct, 2017
From: Daren Sawkey <Daren Sawkey>

Hi,

> > 1. As I understand it, a perfectly diffuse reflector with no air gap
> > between the scintillator and the reflector can be modeled by selecting
> > the SetModel to be UNIFIED, the SetType to be dielectric_dielectric, and
> > the SetFinish to be groundfrontpainted. Is this understanding correct?
> > I'm referencing the attachment.

Your understanding of the referenced diagram is correct.

> > 2. If the first statement is correct, would it therefore be redundant to
> > add the following three reflector properties:
> > specularspikeconstant(SS)=0, specularlobeconstant(SL)=0, and
> > backscatterconstant(BS)=0, where lambertian (L) reflection is implicit
> > (SS+SL+BS+L=1) to such a reflector configuration (namely: UNIFIED,
> > dielectric_dielectric, groundfrontpainted)?

Yes. According to the diagram, these properties aren't used.

> > 3. Out of curiosity, if I selected polishedfrontpainted instead of
> > groundfrontpainted (with UNIFIED and dielectric_dielectric), in addition
> > to setting SS=SL=BS=0 (L=1), would the reflector converge to Lambertian?
> > I'm wondering if the reflector constants would override the
> > specularspike reflection mode designated by polishedfrontpainted.

No. These parameters aren't used. Again, refer to the diagram.

Example extended/optical/OpNovice tells you the reflection type for each reflection.

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