VR performance with RTX 3060 Ti, 3070, 3080 & RX 6800?

[edmuss]

Ah, it's just that the winwing export lua has been known to cause performance issues.  Something else then

[DeltaMike]

Andrew -- 

Are you having a lot of frametime spikes?  Look in fpsVR -- how many red lines do you see in your GPU time graph?  

If it's a lot you either need to

1.  Render fewer pixels
2. Lower your settings (especially MSAA and shadows)
3. Lower your target frame rate
4. Reduce frame time variability (which is a probletunity with AMD GPU's, dunno about NVIDIA)

Also be aware, certain hardware issues can also cause this.  

• Faulty USB cable
• Outdated USB drivers
• USB conflicts 
• PCIE issues (for a while there PCIE4 wasn't working at all, although it's been working for me)
• Power delivery issues (?maybe)

 

If you're not seeing a bunch of red spikes -- and if you're consistently holding 50fps, I'll bet you aren't -- what you're describing is "judder." 

Some of that can be a result of a frametime / refresh rate mismatch (which you would get at 50fps, but not at 45 or 30), but from your description, suspect you're simply dealing with the stroboscopic effect we would expect from panning a camera rapidly through an environment that's being rendered at a relatively low frame rate.  The bane of movie producers everywhere.  (You'll see it when you go to the theater to watch Top Gun Redux, which was filmed at 24fps)

That's why God invented motion smoothing.  Get your frames up to 90 and it will cut most of that stuff out (hard to get rid of it completely).  Note, using motion smoothing also lowers your target frame rate to either 45 or 30 fps, depending on what you set your refresh rate to.  So it solves a lot of "stuttering" problems.  Causes its own artifacts of course.  No free lunches around here, it seems. 

VR isn't for everybody, that's for sure.  The G2 isn't for everybody either; tuning this thing is a pain in the gonads.  

Edited March 10, 2022 by DeltaMike