[Radiance-general] Color reflectance values and materials..

[Lars O. Grobe]

While I agree that extending the material file in the radiance 
distribution would be useful for viz, I'd like to encourage those who 
did not try yet to use their digital cameras and a calibration tool such 
as macbethcal and the not too expensive chart as a measurement device. 
Today as almost everyone has the equipment for digital photography, this 
should be not too difficult. While one can certainly discuss the 
accuracy, obtaining an "inaccurate" sample of the material that is 
actually to be simulated should still be better then an accurate sample 
of a generic material.

That said, the most important feature of a new material database must be 
detailed documentation of the samples, measurement equipment, conditions.

CU Lars.