This is a development kit verson for developers; not consumers.
The is an Oculus Rift designed by Oculusvr.com.
VR is awesome and immersive, but it can't fool all your senses all the time. This can lead to something very similar to seasickness or motion sickness, which can lead to nausea, sweating or headaches. My advice is as follows:
Start slow. For the first few sessions, plan to play for no more than ten minutes in VR.
Calibrate the device for your eyes. Having the correct IPD helps a lot.
Start with some of the characters with slower-paced playing styles, such as Heavy or Medic. Avoid the faster or close-range characters such as Scout, Pyro, or rocket-jumping with the Soldier - they can produce particularly intense experiences in VR.
Stop if you feel unwell. You cannot "push through" motion sickness, it just continues. If it gets bad it can last a long time after you stop playing. As soon as you feel uncomfortable, take the HMD off, take a break and do something else for a while.
Many people find that over multiple play sessions they become used to the effects - they get their "VR legs" - and can play for longer without feeling unwell.
Some lucky folks never get any ill-effects and can play comfortably for many hours.
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