:20.9125 (Field of View.  A larger value creates a narrower field of view.) 

:11.5 (Rate of convergence.  Stereo Only)

:11.4 Car Ambient Lighting
:11.6 Car Diffuse Lighting

:0.31 Sky red
:0.35 Sky green
:0.5 Sky Blue

:13.0 Cloud Brightness

:13.0 Trackside Object Brightness

Ground Texture Gamma Settings 
(Leave all of these at 1.0 to avoid a lengthy pause upon startup)

Global (multiplier for seperate r,g,b values which follow)

:13.0  Gamma (Gamma>=0.0 & Gamma <=1.0)
:13.0 Luminance (Luminance>=0.0 & Luminance <=1.0)

Red
:3.0 Gamma
:3.0 Luminance
Green
:3.0 Gamma
:3.0 Luminance
Blue
:3.0 Gamma
:3.0 Luminance

Pixel Intensity (scaled to be between zero and one) = pow(Intensity,Gamma)*Luminance

