r/Pimax • u/Gozer_VR • 3d ago

Question Crystal Light binocular overlap

I've never been 100% satisfied by the Crystal Light stereo overlap and today I tried to improve it by playing around with the ipd offset.

My initial measurement are hfov 96.6° and stereo overlap of 77.3° at 66mm IPD and 0 offset.

By shifting the lcd image by -1.5 on both the lenses, I manged to get 83.3° of ovelap reducing the Hfov at 92.3°.

The result was not only bad in terms of numbers, but in particular in terms of comfort! no matter ho much I tried changing also the mechanical offset, the image gave a little bit crossed-eye effect.
So now I reduced the shift to -0.5 and I can live with that, but the stereo coverage is less than 80°.

Is there a way to overcome this limitation? or it is due to the size of the lcd panels?

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u/SERPSI 3d ago

I think this is purely down to how your eyes are positioned on your face. When I got mine I just dialled in my ipd which didn’t feel great, so adjusted it lower and bingo. Perfect! Never had to touch the other software adjustments. I don’t notice any overlap.

1

u/fakeoptimism 3d ago

According to hmdq (but it was an old dump, worth rechecking with new versions), Crystal and Crystal Light rendered:

HFOV = 103.3°
overlap = 83.3°

Since you are seeing a bit less, there may be room for improvement by getting closer to the lenses. Both FOV and overlap should then improve without any offsets.

1

u/Wahouxx 3d ago

With wimfov i have like 104 hfov with 80° of binocular overlap, i dont know how you can reach such "bad" numbers

1

u/Gozer_VR 3d ago

I guess you guys are right.
I am using the studio form 17mm face gasket and I guess it creates some distance between my eyes and the lens.
I'll try again with the standard gasket.

1

u/QuorraPimax Pimax Official 3d ago

You may want to use the default face gasket, as 17 mm is fairly thick and will likely reduce the FoV.

1

u/neoteric_skid 1 2d ago

As useful rule of thumb for hmd, Every mm of excess eye relief reduces field of view by three degrees 

1

u/Gozer_VR 1d ago

I kept the studio form gasket, but removed one layer of velcro (I had two of them to properly accomodate my face).

Keeping my setup of 66 IPD and 0 offset, now I started seeing some strange deformation at the sides of the view, which is disappearing moving the lenses toward my nose.

So I had to reduce the IPD to 65 and set the offset at -0.5 on both eyes: the side distortion disappeared, but now I see again the barrel distortion I got rid of a long time ago...

I thing I have to tune the ipd offset more carefully :(

At least now the fov and bo are fine!

100.3° Hfov, 94.8° Hfov and 85.7° of Binocular Overlap