http://techreport.com/news/31462/mas...to-daydream-vr

The dev kit for HTC's Vive Tracker peripheral is already a hot commodity among virtual reality developers. The company says it's received 2300 requests for an allotment of 1000 dev kits. A team called Master of Shapes just might make the peripheral even more popular, this time for owners of Google's Daydream View VR headset. The team says it has used the Vive Tracker to create a room-scale VR experience for the affordable Daydream platform.
The company's blog explains some of the work behind this novel accomplishment. The team produced a 3D-printed mounting system for the front of the Daydream View headset and ported its Cover Me Vive Tracker demo to Daydream before gluing it all together in room-scale virtual space. The Vive Tracker requires the standard HTC Vive's sensor array, so some setup and extra hardware is still required for a room-scale experience.