OpenVDB is an open sourced 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 a three-dimensional grid. It is developed and maintained by DreamWorks Animation for use in volumetric applications typically encountered in movie production. ...
http://www.openvdb.org/Welcome.html
http://www.openvdb.org/press_release/DW ... elease.pdf
