[Radiance-general] diffuse + specular > total reflectance?

[Lars O. Grobe]

Hi Jack!
> I think that what you want to do is:
>
>     <total reflectance> - <diffuse reflectance> = <specular reflectance>
>
>     thus
>
>     86 - 10 = 76
>
> The specular reflectance that is provided is for a measurement at 60
> degrees incidence, if I understand this correctly.

You mean that, while at 60 degree the specular reflectance is higher,
the average specular reflectance over all angles of incidence should be
the expected value of 76%? I try to get what the values really mean... a
desperate attempt without really knowing what had been measured.

Thanks! CU Lars.