Hello, my name is max, i know more or less blender, i am learning, i am noob xD, but looking for VFX’s things i found a free official open source release from Dreamwork about 3d Volumetric Solution, it is called OpenVDB (http://www.openvdb.org/) it is incorporated in the next version of Houdini Master and it is completely free, i think that is important comment about this free package from Dreamwork studios…
Sorry for my english, i speak spanish 
OpenVDB -> 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.
thanks