What Exactly scene occlusion does for "occlusion queries" and "HZB" ?

[VtalFluffy]

Im curious about what exactly those options does. I see no change using disable, occlusion queries or HZB So what is supossed to happen with each option?

[PRAET0R1AN™]

From patch notes :
Added an option to enable/disable HZB culling to fix stuttering on some AMD/Intel GPUs.

[VtalFluffy]

Originally posted by PRAET0R1AN™:

From patch notes :
Added an option to enable/disable HZB culling to fix stuttering on some AMD/Intel GPUs.

I know that's what the patch notes said, but still dont explains what each option is supossed to do exactly. Example : "if you enable frame generation, you can duplicate frames per second"

[PRAET0R1AN™]

Originally posted by VtalFluffy:

Originally posted by PRAET0R1AN™:

From patch notes :
Added an option to enable/disable HZB culling to fix stuttering on some AMD/Intel GPUs.

I know that's what the patch notes said, but still dont explains what each option is supossed to do exactly. Example : "if you enable frame generation, you can duplicate frames per second"

Its literally there.. it fixes stuttering on some AMD and Intel GPUs.

If you have an nvidia GPU it likely won't make much if any difference.

You might see some changes if you run an Intel Arc GPU or an AMD GPU, but that's only if you're noticing stutters.

It might reduce it but won't fully resolve it either way.

[VtalFluffy]

Originally posted by PRAET0R1AN™:

Originally posted by VtalFluffy:

I know that's what the patch notes said, but still dont explains what each option is supossed to do exactly. Example : "if you enable frame generation, you can duplicate frames per second"

Its literally there.. it fixes stuttering on some AMD and Intel GPUs.

If you have an nvidia GPU it likely won't make much if any difference.

You might see some changes if you run an Intel Arc GPU or an AMD GPU, but that's only if you're noticing stutters.

It might reduce it but won't fully resolve it either way.

It explains why i see no diference trying the three options. i guess there is not much more to say about it, thanks.

[PRAET0R1AN™]

Originally posted by VtalFluffy:

It explains why i see no diference trying the three options. i guess there is not much more to say about it, thanks.

Yeah if you're not seeing any changes at all with that setting you likely don't have a gpu that is affected negatively which that option is there to resolve.

Try turning render preset to custom and in the advanced section set shadows to low, texture quality to medium and shader quality to medium.

Leave everything else as you'd like it to be on high/ultra.

Shadows and shader quality seems to be the biggest performance hit, you can even squeeze out enough frames to be able to run raytracing just with those settings set that way.

[VtalFluffy]

Originally posted by PRAET0R1AN™:

Yeah if you're not seeing any changes at all with that setting you likely don't have a gpu that is affected negatively which that option is there to resolve.

Try turning render preset to custom and in the advanced section set shadows to low, texture quality to medium and shader quality to medium.

Leave everything else as you'd like it to be on high/ultra.

Shadows and shader quality seems to be the biggest performance hit, you can even squeeze out enough frames to be able to run raytracing just with those settings set that way.

Thank you

[avestruzrock]

Originally posted by PRAET0R1AN™:

Originally posted by VtalFluffy:

Try turning render preset to custom and in the advanced section set shadows to low, texture quality to medium and shader quality to medium.

Leave everything else as you'd like it to be on high/ultra.

Shadows and shader quality seems to be the biggest performance hit, you can even squeeze out enough frames to be able to run raytracing just with those settings set that way.

I was running everything in high with RT in the prision and it was going great until I reached the second floor, I had to turn off RT and lower shadows cause the frames droped considerably.

RTX 3080 12gb

[Dude Guyman]

I'd like to know exactly what this does too, not that it "fixes stutter", HOW it "fixes" it. From my quick, unscientific test, in order of best/fastest frame rate:

Querries = a few +4 FPS faster and I swear I could see very slight color banding in the fog.
Disabled = same as HZB but a couple FPS faster, and a couple frames slower than Querries.
HZB = slowest -4 FPS, no visible banding in the fog.

Ryzen 5 5600 that only uses ~40% CPU
Radeon RX 6600 that is usually pegged at 98% (the bottle neck)

[mayurovmih]

Awful, It looks like gamers must to learn graphic engines now to understand game settings.
Some explanation here https://dev.epicgames.com/documentation/en-us/unreal-engine/visibility-and-occlusion-culling-in-unreal-engine
As I got it from this doc - it looks like Hardware calls is more progressive way (so enabled by default) which is supported only on modern hardware. HZB is older tech which makes less calls to the GPU\CPU, but it can result in less objects (outside of camera view) excluded from render scene - so it could increase total GPU load during rendering.
But game settings hint says contrary: "If you have fast CPU, but slow GPU it may be effective to choose HZB" - very strange. Can somebody explain this?
May be Hardware Occlusion Culling has bugs on AMD and Intel?

[Grimzy]

Originally posted by mayurovmih:

Awful, It looks like gamers must to learn graphic engines now to understand game settings.
Some explanation here https://dev.epicgames.com/documentation/en-us/unreal-engine/visibility-and-occlusion-culling-in-unreal-engine
As I got it from this doc - it looks like Hardware calls is more progressive way (so enabled by default) which is supported only on modern hardware. HZB is older tech which makes less calls to the GPU\CPU, but it can result in less objects (outside of camera view) excluded from render scene - so it could increase total GPU load during rendering.
But game settings hint says contrary: "If you have fast CPU, but slow GPU it may be effective to choose HZB" - very strange. Can somebody explain this?
May be Hardware Occlusion Culling has bugs on AMD and Intel?

Its not strange, the game settings hint explains to you what to do if you are bottlenecked by either CPU or GPU.
This happens more often nowadays since most people think a GPU is all that matters, but if you pair a fast GPU with an older processor, the GPU will be bottlenecked because the CPU will not be able to keep up with it, as result your CPU would be used to a 100% and GPU only 10-15%, same applies vice versa.

The hint explains to you which setting would be recommended if you are limited by either one of them.
This isnt a setting specifically targeted to increase performance for everyone, its to lessen the stress for those on older hardware.