IPD issues

[Picard]

Hello. The Hardware IPD is great on the headset. I wanted to know if there will be software IPD as well to affect the rendering. I have a small IPD 55.6mm and notice bowing on the display when comparing to the real world. I can't get a visual match of real life content vs what I am seeing in the Vive because of this.

Thanks

-Scott

[aaron.leiby]

The plan is to have the hardware ipd drive the software ipd, but that's not currently hooked up.

In the meantime, you can add a file called vortexhmd.cfg (make sure Windows doesn't add a .txt extension to it if you have file extensions hidden) with the following text inside:

IPD .0556

This files goes in <Steam Install>\config\lighthouse

I would try setting it to something large to make sure it's working first (e.g. IPD .556 should make things feels like they are moving 10x too fast when you move your head, given the apparent scale of things).

[Picard]

Thanks. The distortion I see is less but it's still there. I am also getting what feels like a strange tracking delay for rotation on the headset. Feels like you are a bit drunk. This is only in UE4.

I did 2 tests.

1: Unreal 4.8 displays barrel distortion issues along with tracking issues.

2: A custom engine we are developing shows the barrel distortion issue but the tracking is fine.

I can minimize the barrel distortion by adjusting hardware IPD so the lens are close together but its still noticeable.

[Picard]

We have a fix for UE4 in terms of the drunken feeling from tracking. There was a bug in the build of UE4 we were using. Figured I would post it here:

From Nick Whiting of Epic:

"There was an issue with stock 4.8 which caused issues with buffering of multiple frames, which is probably what you're seeing. The fix is very simple, and is in StereoRendering.h:

virtual uint32 GetNumberOfBufferedFrames() const { return 1; }

That was 3 in 4.8 because of a merge error. Fix that up, and things should be much smoother."


Now the only issue I still have is the barrel distortion I am getting from the Vive. Not sure if this is some sort of missing option in software or just how it is with the Vive lens.