Hosek Wilkie sky model
Add an Hosek Wilkie sky model to the environment map collection.
Convey incredible realism to even simple scenes.
https://www.shadertoy.com/view/3ddBD8 (here in RGB without any turbidity nor albedo stuff, full code is available with the paper here: https://cgg.mff.cuni.cz/projects/SkylightModelling/ )