Hi everybody again!
I was working with this incredible tool (IPD offset) in the new beta of Pitool, and my Pimax mods… and as you know, I made a lot of tests before.
Long time ago I said to @anon74848233 that we need IPD by software to compensate the stereoscopic distance measure in Pimax. Because, is not the same as IPD, but it’s the same xD. Thanks @Sean.Huang for implementing it.
In human vision, IPD is the distance of our eyes, and Stereoscopic Distance Measure is the same. But in VR is different.
You can view more information here:
As you can see, in VR the software and hardware need to relate both factors. IPD and Stereoscopic virtual measure (or distance). In this way we can achieve a R=1 (read the wiki xD).
First, we need to adjust our Stereoscopic Virtual Measure with the IPD Offset. We need a real object in the same place that a virtual object. Is better if you can place it at 3 meters of you. I did it in SteamVR, because it’s very easy.
Now, you need to stare to this object, and put on and take off very fast your Pimax. If when you interchange real object with the VR placed one… you see double… then, your IPD offset is set bad.
The best way is to change it by 2 steps. From -10 to 10. And if you feel that the cross eye change the direction… then you are near your real Stereoscopic Measure.
You will know what is your perfect Stereoscopic Measure, because when you move ALL the hardware IPD from one side to the other… you will see that real object and virtual object are sync, without double vision. Your eyes didn’t need to focus it again.
That the reason why there are who say “For me all IPDs are good!”. Because the IPD offset for they are 0.
In my case IPD Offset is -0.5. In this vaule, I can use ALL IPD by hardware, and the object is focused.
BUT! Now we need to adjust IPD by hardware. Because the lenses change the distortion across the image, and can modify the apparance of the objects, and cause eye strain.
For me, I prefer a lower number. Why? Because if the two sweetspot are very close, then you can read closer too. For me IPD 63.2 is perfect to read at 20cm of distance in VR.
My real IPD FYI is 66.9 (near) and 69 (far).
One more thing… if you change the foam, distance between your eyes (xD) or distance with your eyes and the lens… you need to do it again.
Bye! And Thank y ou for reading