- Ambient Lum is 1/3 Diffuse Lum if no skybox, 1/2 if skybox.
- Fog Color Lum is the midpoint between Ambient Lum and Diffuse Lum.
- However, I think that if the default Fog Color Lum is 0, then leave it alone.
What about other Environments?
The grayscale ones (Exterior Foggy, Exterior Overcast, Exterior Raining, Exterior Snowing, Exterior Stormy, Exterior Windy, Interior Bright, & Interior Dark) are easy because all of them use a Hue of 160 and a Saturation of 0.
As for the others, I have no idea how to tackle them as their colors are different, i.e. are actually colorful rather then grayscale.
Also, Soren wrote in your quote about adjusting the colors based on the tileset. I have no idea how to do that either due to my lack of knowledge.
As a final thought, I think that following Soren’s advice while using the default Diffuse colors result in nighttime settings being too bright (see Foggy & Raining screenshots above). So I have been experimenting with lower numbers. Now keep in mind, that Grymwurld™ is a grey, bleak, mournful, and depressing place so my numbers are probably going to be lower than most would like unless they’re playing Ravenloft.
Heavy Fog: Exterior Foggy Environment, Moon Ambient Lum 11, Diffuse Lum 33, Fog Color Lum 22. No skybox
Raining: Exterior Stormy Environment, Moon Ambient Lum 10, Diffuse Lum 20, Fog Color Lum 15, Q Overcast skybox.
And also to recap, Symphony had told us on Discord to swap the Exterior Stormy Sun Ambient & Diffuse values, which makes the Ambient brighter and the Diffuse darker. I took it a step further and made the Fog Color the darkest color:
Exterior Stormy Sun Default: Ambient Lum 66, Diffuse Lum 171, & Fog Color Lum 120
Exterior Stormy Sun Swapped: Ambient Lum 171, Diffuse Lum 120, & Fog Color Lum 66
I’ve gone and done the same with all the other Grayscale Sun Environments and like the results. Although, I have been darkening some of the places but still keeping the same philosophy of Daytime Ambient > Diffuse > Fog Color.
Now that we’ve Soren’s advice for nighttime, I’m going to apply the ratios to daytime and see what happens. Which would be to take the Ambient as the base number, make Fog Color 1/2 to 1/3 (depending on skybox) and then set Diffuse as the midpoint. Now I could certainly be off base here. I suspect that his recommendation for daytime would be to still blend the fog color. So I should test that as well.
A (hopefully) final thought: Why is the Hue 160 rather than 0? Should we reduce the Ambient & Fog Color Hues in the same proportion? I don’t think it matters in the greyscale environments but it certainly would in the colorful ones. This also needs testing.