NVIDIA GameWorks Integration

[Alexey.Panteleev]

I've tried working with GPU particles from the first version VXGI and my findings are that they have always been behaving iffy.
It sometimes depends on fps, scene and other times even the GPU emitters themselves (some at least show something, others look frozen, others are just acting like they aren't even enabled).
When you let your scene 'rest' for a while, sometimes particles start popping up. This can happen in a short bit, a long bit or not at all bit.
I've reported this a while back but it was probably overlooked. Doesn't matter that much. Maybe some can use GPU particles in conjunction with VXGI just fine
but my guess, since we are both having no luck, is that there will probably be more having this issue.
Lets hope for a speedy fix :-)

Thanks, I'll try to reproduce the issue. Can you be more specific about the FPS dependency, like for example does it break when FPS is too low? Do the emitters work properly if you disable VXGI?

[Legend286]

I have some emissive for my light meshes and tried a movable light with vxgi checkbox, still didn't work...

[Gandosh]

[ATTACH=CONFIG]51779[/ATTACH]

When I run generate project file.bat I got this.

Anyone know what cause this problem? I already has visual studio 2013 2012 2015 and I already checked if the registry is corrected but I still got this error.

are you on WIN10?

[Netrve]

Thanks, I'll try to reproduce the issue. Can you be more specific about the FPS dependency, like for example does it break when FPS is too low? Do the emitters work properly if you disable VXGI?

I haven't encountered any FPS dependency, in my tests it didn't matter if I had 20, 30, 60 or >100 fps. Turning off VXGI does resolve the issue.

[Musetatron]

are you on WIN10?

I'm on win 8.1. I got too many errors in the whole process of using hairworks. I plan to use hairworks in my game but now I go back to the polygon plane hair method while waiting for the answer.

[Chesire]

Thanks, I'll try to reproduce the issue. Can you be more specific about the FPS dependency, like for example does it break when FPS is too low? Do the emitters work properly if you disable VXGI?

Demo for repro sent your way.

[Gandosh]

I'm on win 8.1. I got too much error in the whole process of using hairworks. I plan to use hairworks in my game but now I go back to the polygon plane hair method while waiting for the answer.

oh right.. i just got this problem on WIN10. I just thought it was WIN 10 problem, but looks like it was not...

[Alexey.Panteleev]

Demo for repro sent your way.

Thanks a lot!

I reproduced the issue and fixed it in the internal version. The problem was that whenever we prepared for voxelizing anything, we called FXSystem->PreInitViews, which switches the frame index, and the simluation doesn't work properly because that should only be done once per frame.

To get it fixed before our next release, you can edit the file Engine/Source/Runtime/Renderer/Private/SceneVisibility.cpp and modify this piece in PreVisibilityFrameSetup function:

if (Scene->FXSystem)
{
    Scene->FXSystem->PreInitViews();
}

Replace the condition with this:

if (Scene->FXSystem && !Views[0].bIsVxgiVoxelization)

[Netrve]

Thanks a lot!

I reproduced the issue and fixed it in the internal version. The problem was that whenever we prepared for voxelizing anything, we called FXSystem->PreInitViews, which switches the frame index, and the simluation doesn't work properly because that should only be done once per frame.

To get it fixed before our next release, you can edit the file Engine/Source/Runtime/Renderer/Private/SceneVisibility.cpp and modify this piece in PreVisibilityFrameSetup function:

if (Scene->FXSystem)
{
    Scene->FXSystem->PreInitViews();
}

Replace the condition with this:

if (Scene->FXSystem && !Views[0].bIsVxgiVoxelization)

Thank you Alexey for the quick support!

[Squarecoin]

Are there still efforts to update the release of Hairworks? Having more than a single directional light would be wonderful for cinematic work.

[vimaxus]

With the current Flex branch, I can recreate the cereal blowl scene and it's awesome. I would need however the smoke simulation and the shader. Amazing stuff this unified type of interaction that Flex offers.

[RoadStar]

Hi!

Please check attached image with HairWorks behaviour in VR Preview mode:

Hairs shifted left in left eye, right - in right eye...

Also hair quality in right eye is very basic.

Can you advice a best place to check for possible fix?

UE 4.8.0

Thank you!

[Chesire]

Thank you Alexey for the quick support!

X2!

[Musetatron]

are you on WIN10?

Problem solved with this link https://answers.unrealengine.com/que...fessional.html

[Musetatron]

Problem solved with this link https://answers.unrealengine.com/que...fessional.html

If anyone have a problem with cmd can't find visual studio It's this.