OK, I know you know more about this stuff than the rest of us do... Here's
an example, taken from here
http://www.cs.utah.edu/~bes/graphics/spectra/19_WHITE.sd
# File: /usr/testbed/files/sdb//macbeth.sdb
# Material Class: MACBETH CHART
# Material Name: 19 WHITE
# Comment:
# white                              mccamy76       19   white
# NBS Index: 263 white
# Chromaticity: (0.309906, 0.317325, 0.372769) luminance 0.898767
# Coefficient of Extinction: 0.000000
# Index of Refraction: 0.000000
# Average Energy: 0.582036
246 <snip>long list</pins>
Now, the way I read is is:
texture {pigment {rgb <0.309906,0.317325,0.372769>} finish {ambient 0
diffuse 0.898767}}
What would "average energy" be, and how do I apply it to these numbers?

Thanks in advance, Kari.

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