Quest 2 - Significant FPS increase with Oculus Debug Tool

[MilesD]

Hey all  Quest 2 users,

I am sure this has been talked about, but I missed it, so someone else may have.

I was messing about with the Oculus Debug Tool "FOV-Tangent Multiplier", which is used to independently adjust the horizontal and vertical rendered area of the headset.

I was surprised to find that I was able to set this to 0.8;0.7 and not cut off any viewable area in my FOV.

This reduced the rendered area by 80% in the horizontal x 70% in the vertical, for a total reduction of 58% (I think) without any apparent tradeoff.  With this  one setting I was able to increase my framerate about 20FPS, from 38 to 58, on a i7@4.4gHz running a 1080ti. I am now able to turn on MSAA again without having to turn down any other graphic settings. I can also stay above the critical 36 FPS for a headset refresh rate setting of 72MHZ to have smooth ASW.

MilesD
 

Edited November 8, 2022 by MilesD

[Steel Jaw]

Oh excellent, I will give that a whirl Sir.

[Spetz]

I managed to get my FPS back up to about 35-38 now without using OTT on 2.8, but will give this a shot with my Q2 set on 90hz and see what happens. Cheers!

[Steel Jaw]

I forget, where do I find the Oculus Debug Tool  again please?

[Willdass]

3 minutes ago, Steel Jaw said:

I forget, where do I find the Oculus Debug Tool  again please?

In the Oculus installation folder: null

[5ephir0th]

It surprise me how you guys can set 0.8 or even 0.7 without noticing the black border, i have been using this long time ago but anything below 0.92 i start to see the borders, maybe its due i have a small face, making my eyes stand closer to the lens...

[MilesD]

7 hours ago, 5ephir0th said:

It surprise me how you guys can set 0.8 or even 0.7 without noticing the black border, i have been using this long time ago but anything below 0.92 i start to see the borders, maybe its due i have a small face, making my eyes stand closer to the lens...

Yes, I think you are correct, and I would assume it varies significantly per individual. My head and eye socket structure put my eyeballs a bit further back from the lenses than most. I upped the diopter a bit on my distance prescription for my DIY lens inserts to help with that. I am sure my visible pixel density is less than yours.
 

[Steel Jaw]

I remember now already playing with this a year ago and didn't like it.  A "soda straw" effect comes with this when the black borders close in andso it breaks immersion for me because it feels like I am looking INTO this VR world rather than being INSIDE it.

[Hoirtel]

15 hours ago, 5ephir0th said:

It surprise me how you guys can set 0.8 or even 0.7 without noticing the black border, i have been using this long time ago but anything below 0.92 i start to see the borders, maybe its due i have a small face, making my eyes stand closer to the lens...

This is my experience. I have been running 0.9 on both for a long time now and it absolutely does help FPS but I can notice this reduction if I look for it. Any more is too much. Its a really good tweak though as it reduces workload without changing graphic settings.

[MilesD]

16 hours ago, Steel Jaw said:

I remember now already playing with this a year ago and didn't like it.  A "soda straw" effect comes with this when the black borders close in andso it breaks immersion for me because it feels like I am looking INTO this VR world rather than being INSIDE it.

For me, the key was to slowly reduce the multiplier to the point where you can just see the black edge tangent to you circular FOV, and then slowly increase it until you can no longer see that edge.

It's also important to do this while looking straight ahead and try to notice the black edge using your peripheral vision. If you move your eyeball and look/focus at the edge of the FOV, you will not notice it as much, because your line of sight to the edge is reduced due to the pupils lateral movement.

Again, All of this is dependent on eyeball placement relative to the lenses, essentially how close we can get the lenses to them. This setting Is probably most helpful for those with deep eye sockets, wear glasses, or using  prescription inserts.

Miles

Edited November 10, 2022 by MilesD