Lucky Croissant

You can definitely do this with VDBs, but I’d separate density from colour rather than baking everything into one field. Start with a sphere → VDB From Polygons to create your fog volume, then generate a radial gradient using the distance from the sphere center (Volume VOP / Volume Wrangle works well). Use that gradient to drive density falloff from surface → outer atmosphere. For colour, either create a separate volume field (Cd or custom vector field) and export it with the VDB, or keep colour entirely in Redshift and remap based on volume position/density for more flexibility in the other DCC. Usually density + temperature/gradient masks exported gives cleaner control than embedding final colour directly into the VDB.