Just stumbled across this, tried watching the vid, but a lot went over my head, but sounds like it does the same thing but is free so might be worth watching as V4.0 is due out this week.
http://www.mtbs3d.com/news-2/14962-35-minutes-of-vireio-perception-goodness
So VorpX has supported DX11 for a while but mostly ends up using Z depth to create pseudo stereoscopic images.
Vireio is using DX API calls to make the game engine create true stereoscopic images which is better but they've just taken longer to get DX11 working because of course it's free and being coded by volunteers.
I still wasn't sure if the Vive is supported at all in the v4.0 this week or he was just hinting that the Vive is being added for a later release with room scale added later again.
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