Forum Discussion
Understanding IPD and how it relates to nausea
Just got my Rift this past Friday, totally awesome by the way. I’ve run OVR config utility and came up with 67.4mm for IPD. Then I went to see my eye doctor and had them read my IPD and they came up...
One thing to remember about adjusting the IPD in demos is that all it does is adjust the distance between the cameras and the result of this is a change in scale perception. It will not improve image quality as it doesn't offset the distortion centre as this has to be aligned with the position of the lenses. If you adjust the value to an extreme you will experience issues particularly if the IPD is inverted and the eyes are swapped.
The only reason you want to change the IPD is to try to make your perception of scale match your real world perception. This also requires adjusting the camera height. Having this match your real world perception helps your brain accept what it is seeing.
The lack of horizontal lense separation to match your IPD is also a critical issue for image quality.
Nausea related issues are caused by several things, for me it is most commonly caused by a lack of grounding in what I am experiencing. Your eyes seeing things that your brain finds irregular. Cockpit based simulators like my own Lunar Flight have a really strong frame of reference so nausea tends to be almost non existent. If I get out and walk around, using the XBox controller to adjust my rotation tends to make me feel a little ill because my body is not controlling the motion. Any thing that externally influences your look direction tends to make you feel off also moving at super human speeds laterally can be bad also.
Lastly I think performance is a big issue, you really want to have a solid vsyncd 60 FPS to reduce eye strain and headaches. When the HD kit comes along you're going to want a fairly powerful machine. I see this as a problem for the large scale adoption of the technology by the masses. Many people are going to buy one and have a fairly poor experience on low to mid spec machines and they will be a potentially larger part of the market.
The only reason you want to change the IPD is to try to make your perception of scale match your real world perception. This also requires adjusting the camera height. Having this match your real world perception helps your brain accept what it is seeing.
The lack of horizontal lense separation to match your IPD is also a critical issue for image quality.
Nausea related issues are caused by several things, for me it is most commonly caused by a lack of grounding in what I am experiencing. Your eyes seeing things that your brain finds irregular. Cockpit based simulators like my own Lunar Flight have a really strong frame of reference so nausea tends to be almost non existent. If I get out and walk around, using the XBox controller to adjust my rotation tends to make me feel a little ill because my body is not controlling the motion. Any thing that externally influences your look direction tends to make you feel off also moving at super human speeds laterally can be bad also.
Lastly I think performance is a big issue, you really want to have a solid vsyncd 60 FPS to reduce eye strain and headaches. When the HD kit comes along you're going to want a fairly powerful machine. I see this as a problem for the large scale adoption of the technology by the masses. Many people are going to buy one and have a fairly poor experience on low to mid spec machines and they will be a potentially larger part of the market.