I'm still playing around with Lightsys, and the more I learn, the more 
questions I have.  :-)

I did some tests with some of the demo scenes for Lightsys 4, where I 
replaced the reflective spectral data rgb values with plain-old rgb values. 
For the items I tested with, I didn't notice any big differences, but 
perhaps there are small differences which are more subtle.

My question(s) at this point:
What are the benefits of using the reflective spectral data (e.g. 
RS_White_Paint_1) over normal pigments?  Is it simply that the RS values 
will look better under a much wider range of lighting?  Is it ok to mix 
normal rgb pigments (e.g. rgb <1,0.8, 0.6>) along with the RS values?

Lightsys is an amazing set of includes/macros which everyone should probably 
be using, but at this point, I don't understand it very well.  Some day, it 
would be nice to have a good tutorial "Lightsys for Dummies" or something. 
Perhaps I'll begin writing it up, if I ever get to the point that I truly 
understand enough of it.

As always, any insight would be appreciated.

-- 
Jeremy
www.beantoad.com

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