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I imagine some kind of VR tracker for the Quest will come out eventually. Something like the Vive trackers but smaller. Agree, it would open up all kinds of interesting applications.

They could be wildly successful if instead of $100 pucks they could just sell $1 stickers that you could attach to whatever you want. With enough of them you could probably use it to aid scanning in geometry of real world objects

Not at this time, hands only. I imagine it might be difficult to distinguish a pointer from other straight lines in the room, hands are a little more distinctive.

Objects would create occlusion which will block the camera from being capable to track finger vectors.