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Question Re: difference between polished and polishedfrontpainted 

Forum: Processes Involving Optical Photons
Re: Question difference between polished and polishedfrontpainted (Athreya Shankar)
Re: Feedback Re: difference between polished and polishedfrontpainted (Gumplinger Peter)
Date: 18 May, 2012
From: Athreya Shankar <Athreya Shankar>

Dear sir,

For my convenience, (and hopefully for other users'), I have made a diagram summarizing the types of optical surfaces available in the unified model. I have provided the details as I understand them. Could you please go through it and let me know if it is right?

 Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/05/18/05.24-21390-al_surfaces_in_geant4.png

Also, I have two more questions:

1. In one of your replies to another user, you have written,

When the surface is defined as 'ground', the code, as it is written, samples theFacetNormal (using the sigma_alpha you specified) and then employs Snell's law to arrive at one of the two reflections or refraction. If a reflection occurs, the type of reflection is sampled from the probabilities you specified for UNIFIED model's reflection parameters, SS etc. This will not converge to the same thing as 'polished' even when SS==1 unless you also have sigmaalpha = 0.

My doubt is about the last statement - even when sigma alpha is not 0, and if SS=1, then shouldn't the reflection be exactly like from a polished surface? Because, SS=1 (I think) implies a spike reflection about the global surface normal always, and therefore the facetNormal (and consequently sigma alpha) does not come into the picture at all?

2. What is the role of SetPolish in the glisur model? that is, is it the same as sigma alpha in the UNIFIED model?

Thanks a lot,

Athreya

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1 Feedback: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 18 May, 2012)
(_ Feedback: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 19 May, 2012)
(_ Agree: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 22 May, 2012)
(_ Feedback: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 23 May, 2012)
(_ Disagree: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 23 May, 2012)
(_ Ok: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 23 May, 2012)
(_ Question: Re: difference between polished and polishedfrontpainted   (Erik Dietz-Laursonn - 10 Sep, 2012)
1 Feedback: Re: difference between polished and polishedfrontpainted   (Gumplinger Peter - 18 Sep, 2012)
1 None: Re: difference between polished and polishedfrontpainted   (Erik Dietz-Laursonn - 19 Sep, 2012)
2 Ok: Re: difference between polished and polishedfrontpainted   (Athreya Shankar - 03 Oct, 2012)
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