You might also try looking into using a particle system to sprinkle volumetric particles around, if you’re looking for that early morning rolling heavy fog look. Volumetric Fog in Unreal Engine | Unreal Engine 5.0 Documentation will get you started with a simple material you can use. You can expand upon it to add in some swirling animation effects within the particles and then with the particle system, you can introduce movement of the actual particles. Collision can also be used to let the tufts skate along the surfaces of things. Just keep in mind the costs of everything because they can add up fast.
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