[Radiance-general] Color definition in Plastic material

[Germán Molina Larrain]

Hello Xiaoming,

If I understand the Materials documentation
<http://radsite.lbl.gov/radiance/refer/materials.pdf> correctly, I would
say that the Red, Green and Blue are total reflection. If specularity is
non-zero, the diffuse reflection is reduced by this amount:

rho_d = p*C*(1-specularity)

At least, that would be my guess.

Best!

2017-01-20 16:28 GMT-03:00 Xiaoming Yang <xiyang at fosterandpartners.com>:

> Hi,
>
>
>
> I have a rather basic question about color definition for plastic material
> and hope someone could help me.
>
>
>
> mod plastic id
>
> 0
>
> 0
>
> 5 red green blue spec rough
>
>
>
> *Does the red, green and blue define diffuse reflection or total
> reflection?*
>
>
>
> For example, if a material reflect 40% light diffusely and 10% specularly,
> is it correct to define this material as:
>
> Void plastic testMaterial
>
> 0
>
> 0
>
> 5 0.4 0.4 0.4 0.1 0
>
>
>
> I was checking with the spectrum data from SUTD
> http://www.lighting-materials.com/materials/648
>
>
>
> And it seems they are using the other approach which defines R G and B
> with total reflection and the material will be
>
> Void plastic testMaterial
>
> 0
>
> 0
>
> 5 0.5 0.5 0.5 0.1 0
>
>
>
> Xiaoming
>
>
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>
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