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ryahata's avatar
ryahata
Honored Guest
11 years ago

VSync & GFX.WaitForPresent

Currently the VR experience that I'm working on has a lot of judder due to FPS being lower than 75. When I poked around in the profiler I noticed that most of the "lag" was due to GFX.WaitForPresent. ...
vrdaveb's avatar
vrdaveb
Oculus Staff
11 years ago
"ryahata" wrote:
When I poked around in the profiler I noticed that most of the "lag" was due to GFX.WaitForPresent.

Gfx.WaitForPresent is kind of a catch-all that appears anytime the CPU waits for the GPU to finish a frame. You can check the GPU profiler to see what's taking up the time.

"ryahata" wrote:
Also, has anyone gotten one of their VR experiences to run judder free in Direct HMD Access mode at FPS < 75?

Rendering really needs to keep up with the display refresh rate. The moment it drops, the experience will be significantly worse. But it may fail more gracefully if you disable TimeWarp, VSync, and Low Persistence in OVRCameraController.

"ryahata" wrote:
Finally is there a way to run the DK2 in Direct HMD Access mode at 60 Hz?

This doesn't seem to be possible in direct mode. But you can force it to 60Hz in extended mode. Note that DK2 has a hardware feature that disables low persistence by default when running at 60Hz. If that happens, you can still make it use low persistence if you toggle it twice after the app has started up.