Luoshuang's GPULightmass

[leoletsrock]

Trying the 4.20.1 version and hit another error, any ideas?

<None> === Lightmass crashed: ===Unhandled Exception: 0x80000003
Fatal error: [File:C:\UE4-GPULightmassIntegration\Engine\Source\Programs\UnrealLightmass\Private\Lighting\LightingSystem.cpp] [Line: 1402]
Static lighting thread exception:
Unhandled Exception: 0x80000003

0x00007ff9876edf71 GPULightmassKernel.dll!UnknownFunction []
0x00007ff9875f59a1 GPULightmassKernel.dll!UnknownFunction []
0x00007ff9875f7e01 GPULightmassKernel.dll!UnknownFunction []
0x00007ff9875ee231 GPULightmassKernel.dll!UnknownFunction []
0x00007ff9875eafcc GPULightmassKernel.dll!UnknownFunction []
0x00007ff7afa0bf6c UnrealLightmass.exe!UnknownFunction []
0x00007ff7afa2fb05 UnrealLightmass.exe!UnknownFunction []
0x00007ff7afa2e849 UnrealLightmass.exe!UnknownFunction []
0x00007ff9864e8d38 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ff9864e36d7 UnrealLightmass-Core.dll!UnknownFunction []
0x00007ffa15e13034 KERNEL32.DLL!UnknownFunction []
0x00007ffa16223691 ntdll.dll!UnknownFunction []

[NVR_SamWhite]

I have also hit an assertion fail, however at a different location to leoletsrock.

We have had this working in a few scenes with promising results (UE4.21.2), but we just tried another scene (the only difference is that it is fully indoors) and we get consistent error:



Which is followed by:



If i can track down the cause of this ill report back

[leoletsrock]

Hey Guys,

I just do-again all steps on page1 and things seem work perfectly fine. Here is the scene FYI. Even the strange lighting (''Wave'' shadow) on wall is magically gone!!

Luoshuang you are the best!

[Mike_Kennedy]

The script is a helper to avoid manually copying, backing up, and doing boring stuff, it looks for the registry key that should be there if you installed properly UE4. The issue is definetly not related to using something else than C, is I currently use "D" and that's why it looks the registry for the folder. I can't however debug all situations, nor look at other OS Languages.

You can try reinstalling UE4, that worked for some people, but then egain, if it is not working you can do it manually as instructed in the first post.

There is not much I can do unless someone with the problem like you is willing to debug the issue with the registry and work out a solution. I can't fix what's not broken.

Could I get a link to the first post, same issue with registry here I want to fix, your script is super helpful.

[Pollaco]

Good morning everyone. I have a problem when building the lights. Out of Memory Could you help me Christian Lugo

[Situx]

Could I get a link to the first post, same issue with registry here I want to fix, your script is super helpful.

https://forums.unrealengine.com/deve...s-gpulightmass

The latest version of the script should work with 4.21.1, but there could be bugs:
https://github.com/sgeraldes/LightmassConfiguration

Not sure why, so if you want to troubleshoot, let me know what you can find in the following registry key:
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\EpicGames\Unreal Engine\4.21

You should see something like this:

[Bimbachi]

Dear all,
I'm using GPU lightmass calculation.
I have 2 light scenario level and one persistent with geometry.
On both light scenario I have spotlights that I duplicated from one and moved to other light level , light values were modified afterwards.
and now
after calculating lightmap on one level and opening other one witch had already calculation done Editor indicates me that I need the recalculate light for those spotlights on this level.
and vice versa. even when I do calculation for both level together after successful run have same warning on one level.
If somebody understand what is going on with this?

[tomtnt]

Hallo,
is rectangular area light supported? Is there any way to do rectangular area light source? Is material emission supported?
Thank you.

[PMcKenzie2004]

Hallo,
is rectangular area light supported? Is there any way to do rectangular area light source? Is material emission supported?
Thank you.

Both work fine for me, set them up the same as with CPU (default) lightmass.

[Mardud]

Dear all,
I'm using GPU lightmass calculation.
I have 2 light scenario level and one persistent with geometry.
On both light scenario I have spotlights that I duplicated from one and moved to other light level , light values were modified afterwards.
and now
after calculating lightmap on one level and opening other one witch had already calculation done Editor indicates me that I need the recalculate light for those spotlights on this level.
and vice versa. even when I do calculation for both level together after successful run have same warning on one level.
If somebody understand what is going on with this?

I have also two light scenarios(day/night) without problem.

Maybe make sure you have really these light in level you want and make sure you have checked "Toogle light scenario" in levels with lights.

[Bimbachi]

I have also two light scenarios(day/night) without problem.

Maybe make sure you have really these light in level you want and make sure you have checked "Toogle light scenario" in levels with lights.

thanks,
in fact I did check it already, but will double check it.

My suspiciuos was to how i added spotlights to night level , it was by copy paste or duplicate. I had impression that this leavs some kind of link. Beacuse what is a sense that by calculating on one level it changes status of lights (already calculated) on other level??
by the way meshes looks lighted correctly.

[tomtnt]

Both work fine for me, set them up the same as with CPU (default) lightmass.

Nope, Rectangular area light is not simply working. I have tested it in 4.21GPU and 4.20 CPU - same scene and as I thought from previous test, the GPU version does not see any rectangular light. So in the GPU version are only "primary rays" that are done every time by CPU (for all types of lights) but there are no other calculation of secondary rays (secondary bounces) by GPU. So the result is simply without any GI on GPU version but you can see just first rays - anyway, that is wrong.

I have tested also Emissive material. It is working good seems to me (needs to be emissive material + turn on emission in object properties)

[PMcKenzie2004]

tomtnt, good testing, I stand corrected . I'll try myself but I believe that I'll see the same results.

[AE_3DFX]

Lets hope upcoming Lightmass will use OpenCL too as i just got Vega 64 cheaply and it has massive power for calculations.

[tomtnt]

Lets hope upcoming Lightmass will use OpenCL too as i just got Vega 64 cheaply and it has massive power for calculations.

compare nowadays renders Vs unreal ligtmass is lightmass so old technique. I would like to see some GI baking tests by Vray CPU in Unreal - but there is not much information now.
Anyway, GPU is fine, but It is very limited due the Vram size. If there would be medium expensive graphic cards with 32 or 48 or 64 VGram that would finally starts GPU calculations for masses.
Btw, a bit surprised me that Unreal is still using photons for secondary rays. (I stopped using them 10 years ago?...on the other hand, it was developed for games and I work in CG...)