700d168a5c
Currently `Mesh to Volume` creates a volume using `openvdb::tools::meshToVolume` which is then filled with the specified density and the class set to Fog Volume. This is wrong because `meshToVolume` creates a signed distance field by default that needs to be converted to a Fog Volume with `openvdb::tools::sdfToFogVolume` to get a proper Fog volume. Here is the description of what that function does (from OpenVDB): "The active and negative-valued interior half of the narrow band becomes a linear ramp from 0 to 1; the inactive interior becomes active with a constant value of 1; and the exterior, including the background and the active exterior half of the narrow band, becomes inactive with a constant value of 0. The interior, though active, remains sparse." This means with this commit old files will not look the same. There is no way to version this as the options for external band width and not filling the volume is removed (they don't make any sense for a proper fog volume). Pull Request: https://projects.blender.org/blender/blender/pulls/107279
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