I must have wrote two pages and accidentally hit delete.
Here's why we are having issues with lighting, a picture's better than al ong post anyhow. The suns position is to the right in this picture, the terrain should be casting a shadow but is instead casting light.
settings dark 50% bright 50% alt bias 0 shadows 100%
The terrain and GB's are castinglight instead of shadows. in software mode it is workign as one would expect, dark shadows opposite the sun.
I noticed the same effect when I kept every setting the same except I slid dark down to zero. The terrain itself was a little lighter, and the "pseudo shadows" not as bright" sliding up the dark makes the shadows brighter.
Ill investigate and post further but I am thinking perhaps Bill programmed the lighting in software mode? Or the card drivers handle lighting the opposite as they did when the game came out.
I have learned with shadows at zero, any lighting effect is pretty much cancelled out, no shadows or shading of object and GB's. so to achieve lighting at all one must have some percentage of shadow. In all my experience I was not able to "lengthen the shadows" I am assuming this is done with the suns height relative to the horizon.
more to come when I have some quite time ;D
if anyone has any insights please toss them forward. I am happy to pass around the TXX so we can test lighting on different machines and see if it is a driver issue. IMHO there;s too many variables to use more than one test track.