NVIDIA GameWorks Integration

[WindyStrife]

WindyStrife thanks alot for your build...its huge but works PERFECTLY!! used visual studio 2017 to compile and made all files NOT READ ONLY as per Gomo 's advice

Thanks may be i will work new merge build (Flex, Flow, VXGI, Blast, HairWorks, Volumetric Light, WaveWorks) when 4.19 offical release

[nildoe]

WindyStrife that would be so awesome!! btw do you know how to install datasmith into your custom build??

[WindyStrife]

WindyStrife that would be so awesome!! btw do you know how to install datasmith into your custom build??

yeah it's still a plugin, you can recomplie it

[Rendolf89]

Has anyone integrated NVIDIA Bokeh Depth of Field?

[nildoe]

yeah it's still a plugin, you can recomplie it

well I hope you can be able to integrate datasmith...i have no idea how to integrate it!

[WindyStrife]

well I hope you can be able to integrate datasmith...i have no idea how to integrate it!

now it's in 4.19 :/ i don't keep 4.18 ver to recomplie it :/ :/

[Milionario_]

My VXGI 4.17.2 build is running terribly, from demos i seen this cannot be right. Its running at 5 FPS max when i check "Enable Diffuse Tracing", my scene doesn't even change.

My pc is low end but i didn't expect to have this kind of performance at all, never get this with LPV.

AMD FX 6300
RX 460
8GB

[Leandro_Bianquini]

I don't meet this error, what version of windows do you use???

Thanks man, a solve this unistalling a program called WARSAW a bank protector or something like that, maybe exist only here in Brasil. Now your Branch runs perfectly. Thanks a lot. Cheers!

[derekbensonart]

Thank you for all the help everyone (mostly Windystrife)!

Has anyone gotten the diffuse fluid particles to work? How did you do it?

[WindyStrife]

My VXGI 4.17.2 build is running terribly, from demos i seen this cannot be right. Its running at 5 FPS max when i check "Enable Diffuse Tracing", my scene doesn't even change.

My pc is low end but i didn't expect to have this kind of performance at all, never get this with LPV.

AMD FX 6300
RX 460
8GB

VXGI is need very powerful PC, you can reduce settings


To improve cone tracing performance, edit the PostProcessVolume settings:
Disable specular tracing
Set “Diffuse Tracing / Number of Cones” to 4
Set “Diffuse Tracing / Tracing Sparsity” to 4 (quarter-resolution tracing)
Enable “Diffuse Tracing / Use Temporal Filtering” (to remove flickering artifacts)

To improve voxelization performance, set these console variables:
Set “r.VXGI.MapSize 64” (to improve both voxelization and tracing performance)
Set “r.VXGI.MultiBounceEnable 0” (to improve voxelization performance)
Set “r.VXGI.HighQualityEmittanceDownsamplingEnable 0” (to improve voxelization performance)



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Here's what I've collected so far for performance. It's not much mind you, but it should be a good starting point, and others can chime in with their own tips or already posted information in that 84 page thread (too time consuming to read it all if you haven't been following from the start).

As Blakblt mention in this post, default settings for VXGI seems to be intended for mimicking the quality of baked lighting. That is good for archviz and smaller more controlled scenes, but can be problematic for others. You need to fiddle with the settings to get the best quality/performance ratio you want. Defaults are in bold.

Console commands:
r.VXGI.MapSize 32/64/128/256
Changes the size of the voxels. Lower (meaning bigger voxels) is better, but increases leaking and inaccuracies. 256 is unusable in most GPUs today. Although Nvidia recommends 64 for better performance, you're likely better of setting this to 32.

r.VXGI.Range 400
As it says, changes the range. This has a side effect however. If you increase this range, it also scales the voxel size, it tries to keep voxel count constant so that you don't get bogged down by too many voxels.

r.VXGI.StackLevels 1/2/3/4/5
As mentioned by Blakbit in this post, this setting has large impact on performance. VXGI reduces voxel resolution for geometry farther than VXGI Anchor (by default attached to camera). Default setting has 5 levels of different voxel sizes. By reducing stacklevel count, you can increase (or decrease) performance. I recommend reading the linked post for more detailed info. Gist of it is you need to use this setting in-conjunction with mapsize and range settings to find a sweetspot that works for your scene.

r.VXGI.MultiBounceEnable 0/1
Enables multibouncing as the name suggests. According to Nvidia overview, it works by using previous frame's irradiance map in the current frame. Nvidia overview here (requires github access) says disabling it increases voxelization performance.

r.VXGI.HighQualityEmittanceDownsamplingEnable 0/1
Mentioned in Daniel.Wenograd's post here and the overview above.

r.VXGI.StoreEmittanceInHdrFormat 0/1
Mentioned in Daniel.Wenograd's post here. This affects the multibounce. As he states few posts below, this is related to VRAM usage, more info here.


Post-Process Volume Settings:
Number of Cones 8
Self explanatory, reducing this increases performance. Nvidia recommends 4. Going lower than that produces too many artifacts in my opinion.

Tracing Sparsity 1/2/3/4
Increasing this reduces the tracing resolution. Nvidia recommends 4.

Tracing Step 0.01/../0.5/../2
Increasing this increases performance, but lighting becomes less stable. At max level of 2 you can see quite clearly see the colors change as you move through the world. This is a case by case setting in my opinion. Some scenes might be more tolerant to this than others.

Use Temporal Filtering On/Off
Nvidia's overview recommends to turn this on to hide flickering artifacts when using performance settings.

Enable Specular Tracing On/Off
While turning this on does increase visual quality (sometimes considerably), you might want to turn it off if you are having performance problems and still rely on UE4's SSR for specular highlights. VXGI is also not that good at doing really reflective surfaces, Nvidia overview mentions you can use "r.VXGI.CombineSpecularWithSSR 1" console command to combine VXGI Specular with SSR. Without this command SSR gets disabled when VXGI Specular is on.

Unclear performance tips:
This presentation mentions use of low-detailed meshes for voxelization. I'm not sure if current UE4 implementation supports using LODs for that.


TL;DR Play with stacklevels, mapsize, and range console variables. Lower tracing quality just enough to find a spot with acceptable level of lighting artifacts. Disable specular if performance still unsatisfactory.

[ihavenick]

VXGI is need very powerful PC, you can reduce settings

Hello. I loved your work and get it working on my pc. But it have a little problem. Hairwork assests is broken and not showing (sample).

[WindyStrife]

Hello. I loved your work and get it working on my pc. But it have a little problem. Hairwork assests is broken and not showing (sample).

I met this error and find out solution for it
your branch is missing dll files
What branch do you use???

i fixed it on lastest commit in my branch (add dll file and fix .gitignore for it)
https://github.com/windystrife/Unrea...IDIA.GameWorks


Or you can check file in "..\Engine\Binaries\ThirdParty\HairWorks"
it needs 2 dll files in it
if u don't see them
it's here:
https://drive.google.com/file/d/1Xlw...ew?usp=sharing

[ihavenick]

I met this error and find out solution for it
your branch is missing dll files
What branch do you use???

i fixed it on lastest commit in my branch (add dll file and fix .gitignore for it)
https://github.com/windystrife/Unrea...IDIA.GameWorks


Or you can check file in "..\Engine\Binaries\ThirdParty\HairWorks"
it needs 2 dll files in it
if u don't see them
it's here:
https://drive.google.com/file/d/1Xlw...ew?usp=sharing

It worked Thank you

[AyanMiru]

Hello everyone!
I've question about Flex fluid. Would really appreciate some help.

Flex works great on large scale fluid simulation, but what if I need to simulate filling of just a cup of beer? Did anyone managed to achieve good results in similar scenes? Preferably without scalling everything up. In my scene Unreal Unit = 1 cm.

Specifically the problem is how particles start to jitter and jump trough meshes when touching collisions if their physical size (in Flex Container) is set to low values like 1 ~ 2. I've tried to use custom simple collisions as well as complex ones, but the problem still persists. I've also tried to set countless combinations of mass, gravity and whole lot other parameters, but they don't seem to solve the problem. Only thing that helped to some extend is increasing simulation steps, but after some point it fails to do any difference as well.

That's needed for video, so performance is not first concern. Any advices?

[DsyD]

Can you send my sample project may be i can help you

Any luck figuring out if this can be fixed? I was hoping it could be done with material or VXGI settings, but no luck so far...

https://forums.unrealengine.com/comm...51#post1438351