There is one extremely convenient place for an additional Constellation sensor that would significantly improve tracking reliability and Oculus has already showed it to us. : r/oculus
Oculus to Open 'Constellation' Positional Tracking API to Third-parties – Road to VR
HoveStar VR for Oculus Rift
How do common virtual reality tracking systems work?
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Oculus Patent | Tracking Constellation Assembly For Use In A Virtual Reality System - Nweon Patent
How virtual reality positional tracking works | Page 2 of 3 | VentureBeat
分解レポートでわかったOculus Riftの修理しやすいデザイン | TechCrunch Japan