Messing around with the property values in ac3d it does look like ac3d uses about 0.2 for the ambient light property as well. I compared a model with the ambient material set to 1.0(for all) and everything else off against a model with diffuse material set to 0.2(for all) and everything else off. The result was the same color on the lit side (and I'm sure diffuse lighting would be 1.0).
This sounds reasonable. The values above weren't the correct ones (I figured out later). I've committed some changes to SimGear and the base package that includes these corrections.
s a result you see much more terrain detail (darker shaded sides and actually lit sides towards the sun). I like it a lot.
Erik
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