Hello,
I’ve been lately working on “VTK To Blender Volume” Node, which allows conversion of 3D vtkImageData into a Blender Volume Object. The node requires a custom build of Blender dependency libraries, to include pyopenvdb in Blender. Currently there’s fair chance that pyopenvdb will be part of Blender by default, but it will probably not happen very soon (maybe next year?).
I wonder are there people who would like to have instructions how to compile custom pyopenvdb-Blender on Linux, to use “VTK To Blender Volume” Node already now? Alternative is to use a custom program like that which @Kareem posted previously to generate OpenVDB file, and import that into Blender. If you would benefit from pyopenvdb-Blender custom build instructions, please like this post!