Exporting data is a pain in the ass for artists, and even more of a pain when trying to target multiple platforms: desktop, mobile, etc. Why should you have to export data, when its easy to turn Blender into a websocket server and export data on demand to whatever format. The other advantage in keeping the data in its native .blend format - the Blender server can LOD the data to target multiple platforms. Take a big fat bong rip, and then check out the latest streaming test with automatic LOD and optimized level-of-interest on the Pyppet blog.
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