Head Mounted Display Microsoft Oculus Unity 
AR Insider
MAY 6, 2020
Or we can put on device on our head (a head-mounted display or HMD) that completely occludes us from the real world allowing us to enter a completely simulated environment which we can walk around and interact in because the computer is sensing our physical actions: this is Virtual Reality or VR.
VRWorld
JUNE 8, 2016
Case in point is Microsoft’s HoloLens, where a development kit will set you back for $3000. Most importantly, the SDK comes with support for Unity Engine and Unreal Engine – you can build and test your own application almost immediately. Unlike the VR, where you can purchase an Open Source VR Hacker 1.4
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