Shadow mapping in distance fog

[mate-h]

Objective

• Fixes Atmospheric fog bleeds sunlight through all objects #22375

Solution

• For each directional light with shadows enabled, we sample the shadow map at the fragment’s world position. The shadow factor (0.0 = fully shadowed, 1.0 = fully lit) attenuates the inscattering contribution for the mie scattering component.

Testing

• Ran the atmospheric_fog example with and without the shadows_enabled flag

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Showcase

before

after

[alice-i-cecile]

This is much better. I remember running into this in my own project years ago!