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BlitzRift - Blitz3D Integration (Open Source)
EDIT: For those curious how this would look when working correctly, along with headtracking, I've put together an almost identical scene setup in Unity. Link: http://www.marbas3d.com/files/UnityR...
It's a shame Platypus was a 2d shooter. It was the best looking Blitz game ever created (imo). A 3d version that let you fly through a plasticine landscape with a Rift would have been awesome :)