Someone might find this interesting.
From the website: http://www.openvdb.org/
OpenVDB is an open source C++ library comprising a novel hierarchical data structure and a suite of tools for the efficient storage and manipulation of sparse volumetric data discretized on three-dimensional grids. It is developed and maintained by DreamWorks Animation for use in volumetric applications typically encountered in feature film production.
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Yeah its cool stuff. Great to see these studios OSS stuff 