The Vive setup guide shows an area about 12 feet by 9 feet - you can have other dimensions (10'x10', 13'x6' etc) that give you the recommended maximum 15' diagonal between Lighthouse boxes.
There has been lots of griping about space requirements and comments that 'nobody' will have this much space. So... do you/will you/can you have this sort of space for VR in your home?
Your vote: Yes I do, thanks for asking
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