[Radiance-general] mirror material ignoring modifier in virtual source calculations

[Randolph M. Fritz]

I believe you need to apply the "inherit" modifier to the alias, otherwise,
indeed, the alias will not inherit the original material's modifier.

Randolph
On Jun 14, 2016 2:37 AM, "goodriver laurus" <rioboo at gmail.com> wrote:

> Greg,
>
> I think I may have found the issue. I was creating a simpler scene to send
> over when I realized that the angular dependence was actually working. I
> almost missed it because the differences were small, but it was working.
> So, I went back to the original test and I discovered that the difference
> was that I had been using aliases in the original test, but had had not
> used them in the simplified scene I sent you, sorry about that. Could that
> be it?
>
> When I use aliases the mirror material seems to ignore the modifier:
>
> void glass glass_alt_mat
> 0
> 0
> 3 0.96 0.96 0.96
>
> void brightfunc glass_angular_effect
> 2 A1+(1-A1)*(exp(-5.85*Rdot)-0.00287989916) .
> 0
> 1 0.08
>
> glass_angular_effect mirror glass_mat
> 1 glass_alt_mat
> 0
> 3 1 1 1
> void  alias window glass_mat
>
> If I use 'window' as the material for the geometry, then 'glass_mat' alias
> is used instead, but the 'glass_angular_effect' modifier seems to be
> ignored. However, if I apply 'glass_mat' as the material for the geometry
> then it does work. So, I wonder if this is a reasonable explanation and if
> it can be explained by the work aliases work. If that is the case it would
> be great to know if there is a way around it so I can keep using aliases
> whilst making sure modifiers are not ignored.
>
> Many thanks,
>
> Rioboo
>
> Hi Rioboo,
>
> Your bat file only creates a single rendering with a single solar position.  In fact, I don't understand the output, which looks much darker than it should be for direct solar illumination.  Are you rendering different solar angles?  Can you do it with a simpler test case, like a single piece of glass with your mirror parallel to a diffuse surface that does not face the sun?  If you ran that at different solar incident angles, the value divided by the cosine of the incident angle (to account for grazing sunlight) should follow the Fresnel approximation you are using.
>
> Cheers,
> -Greg
>
>
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