Hey Joe, thanks for reclaiming this plane :o)
Not sure if this would work. Imagine each pixel must be tested for depth / z-distance to the camera. So you don't know the distance in the first place. The only solution I can think of right now would be to do an additional check with a lower fog bandwidth, as you suggested. Unfort this would require an additional renderworld.
Probably it would be possible to refine the resolution by using something other than a simple greyscale, eg:
fog color 255,128,64. Didn't test it, but maybe this will create more than 256 levels.
Not sure if this would work. Imagine each pixel must be tested for depth / z-distance to the camera. So you don't know the distance in the first place. The only solution I can think of right now would be to do an additional check with a lower fog bandwidth, as you suggested. Unfort this would require an additional renderworld.
Probably it would be possible to refine the resolution by using something other than a simple greyscale, eg:
fog color 255,128,64. Didn't test it, but maybe this will create more than 256 levels.