WIP: Cloud scattering prototype

[mate-h]

Objective

• Add clouds to the atmosphere

Solution

• Add cloud layer bindings, fbm noise
• Alternative solution 1 (preferred): use the FogVolume component to create the cloud layer and improve the rendering logic there.
• Alternative solution 2: use a new ScatteringTerm and the generalized atmosphere parameters with a custom texture somehow.
• Make sure this also works with the FogVolume rendering which is localized volumes for the scene itself.
• Limitations: only renders in ray-marched mode, and does not render in the sky-view lut and consequently the environment map / reflections.

Testing

• Run atmosphere example

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Showcase

Current state: kind of broken lighting but initial proof of concept.