SPOILER ALERT: The conclusions I reached here are wrong. Big time wrong. According to the internet there is no convergence distance (infinite) or there is a 1.3m value. That said, carry on if you want to read me babble on math …

The following text is rather dull and technical. I’m basically dissecting the projection matrix I get from the Oculus SDK in order to guess which convergence distance is being used. Making long short I found that for my setup, with the eye separation (interocular distance) of 6.5cm, the convergence distance is 4m.

This is twice as much as the classic “rule of thumb” of having a convergence distance 30x than the interocular distance.

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