> Positional tracking is a really challenging problem with a lot of limitations. If they were using computer vision to track the controller it would need to be

> Positional tracking is a really challenging problem with a lot of limitations. If they were using computer vision to track the controller it would need to be held within the device's FOV ... First, I think positional tracking of the person within his/her environment is one of the main things that makes the difference between VR and AR. So there's value in that. If you can do it with computer vision maybe it can work in almost any environment. Second, there are RF based positional tracking systems. They're more expensive, true (not if you can design chips yourself, so might even be cheaper for google), but you don't need the controller to have visible elements. Third, hand tracking like this should be able to work usefully, shouldn't it ? I know it doesn't do distance, but ... Just hang it off the viewer pointing downwards with a large volume immediately in front of the user. Not great for gaming probably, but for a virtual keyboard it should work, no ? http://www.ctxtechnologies.com/products/vk-200-keyfob-virtual-keyboard/ http://www.ctxtechnologies.com/products/vk-200-keyfob-virtua...