It seems Disney is going to open source part of its I+D, by opening Partio:
"The goal of Partio is to provide a unified interface akin to unified image libraries that makes it easier to load, save, and manipulate particle files".
Right now it supports "Houdini's GEO and BGEO, Maya's PDB and PDA, RenderMan's PTC" but it is not available to download for now.
The reason to go Open Source seems to be because they "would like to collaborate to design the appropriate format in the context of open source" for a future "efficient cached and ordered format that allows nearest neighbor searches without an initial KD-Tree search and also can have only part of the particle set in memory at once"
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