|Message: Re: Refractive indices of painting materials||Not Logged In (login)|
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3) polishedbackpainted - correct, except:
> Reflection and refraction process are calculated according to Snell's
> law. polished or sigma_alpha parameter is used at this stage to
> calculate the roughness of the boundary.
Reflection and refraction process are calculated according to Snell's law. polished or sigma_alpha parameter is NOT used at this stage to calculate the roughness of the boundary since the boundary is assumed to be polished (same as the backpaint is also perfectly polished); e.g. the 'polished' attribute refers to both the interface (A) as well as the 'backpaint'.
I think you have summarized it very well. The interface (A) is simulated as if there was no 'backpaint'; e.g. as in 'ground' If the interaction with (A) results in refraction (to the outside - for photons coming from the crystal) or reflection (back outside - for photons coming from the 'backpaint') these photons will again be reflected or absorbed at the Lambertian 'backpaint'. This goes on until the photon is refracted back into the crystal.
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