Am 30.04.2015 um 08:07 schrieb Crippso:
> Thanks Alain , that's a very clear description.
>
> regarding transmission that results from using conserve energy: does it matter
> what value for t I use in  color grbt<> vector or does pov ray simply calculate
> a value that is totally independent of t, that is an angle dependent value based
> on the calculated reflectance?

The t (transmit) value still does matter indeed; if e.g. you set 
transmit to 0.5, you get only 50% of the transmittance you would get if 
you set transmit to 1.0.

So if for example the reflection is 20% at a given angle, and you set 
transmit to 0.5, the effective transmittance at that angle will be 
(100%-20%)*0.5 = 40%.

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