OBGE godrays settings
From Nexus Wiki
For those of you who are having problems seeing godrays, try this. Enable godrays and look at the sun doesn't matter what time of day.
Now go into god rays settings in game and you will see these options.
FadeAmount Morningshaft Eveningshaft Density Decay Weight Luminance fmiddlegrey fwhitecutoff
Now I have these adjusted to the following settings.
FadeAmount - No Effect Morningshaft - No Effect Eveningshaft - No Effect Density - 0.5 Decay - No Effect Weight - 6.0 Luminance - 2.5 fmiddlegrey - 6.0 fwhitecutoff - 1.0
No Effect means I see no change in low or high numbers so these options don't matter. You can play around with the other settings trying low or high numbers.