After I use GPU render, it’s fast but I get these light spot at my wall. Could you help me to fix this?
Here is the screenshot
https://imge.to/limks/?list=images&sort=date_desc&page=1
go back few posts earlier:
increasing TDR delay to 300 solved out of memory issue.
PC Specs:
i9-7980x
32 GB DDR4
Zotac GTX 1050 ti
Hy everyone !
I want to show you my latest work with GPU Lightmasss.
The rendering takes 3h on 1080.
I hope you like it
Apologies, but can someone clue me into where I can learn more about this official GPU Lightmass development?
good job. i heard is hired by epic. so GPULightMass will improve greatly in future. fingers cross 
It won’t be getting improved as he’s no longer working on GPU lightmass. Read the thread.
He is however working on improving current lightmass and working on a future version. GPULightmass however is open source and nothing to do with him anymore.
I used the 4.21 version of this and had a bat file to change quality config. the version of 4.22 I downloaded doesn’t have anything like this nor an uninstaller. Help please :_D
Has anyone been able to figure out problems like this where it seems like indirect lighting just doesn’t work? Using 4.22.3 and running into this problem with no bounce-lighting on ceilings, on a purely indoor scene with just point and spot lights.
Yeah it’s bugged in 4.22.3, see https://forums.unrealengine.com/unreal-engine/feedback-for-epic/1605910-issue-with-parameter-texture-object-node-in-4-22
It seems fixed in the current 4.23 beta build (preview 3)
Oh god…you’re right, I just tested it. Thanks for the link, I would never have figured that out on my own.
How did such a massively game-breaking bug not get fixed after three updates…or even get released in the first place…I hope I can cherry-pick that fix commit into 4.22.3 because it’s not feasible to upgrade at this point.
I’m in the same situation…I don’t really know how to backport the fix to 4.22.3…so I’m waiting for Epic to wake up (I don’t want to use a beta build for my current professional project)
About gpulightmass: anybody knows how to use it in 4.23 preview?
Are you using Rect lights?
Fix is in 4.23, it’s an issue with the material compiler. You’re going probably to backport the fix to 4.22.3, it’s what we did. If you’re not a programmer, you should probably move to 4.23. I’ll be very surprised if Epic find time to fix this in 4.22.3 (even if it’s basically a copy/past, it’s taking no more than 10min), generally they’re moving forward and ask to people to update. It shouldn’t be dangerous for your project since the big jump was 4.22 rendering wise.
I was, but I switched them out for spot lights to see if they were bugged with GPULM.
I used git cherry-pick to merge the commit https://.com/EpicGames/UnrealEngine/commit/a711880d7344effa7edf8fa9841ccb5575c6d40b into my 4.22.3 build and it seems to work. It looked like it was still broken at first, but it seemed to fix itself after I made some meaningless changes to my material instances and re-saved them. Maybe the material data is cached somewhere and not updated unless it’s modified.
AFAIK rect lights do not support more than one bounce of GI calculation with GPULightmass so I would recommend not using them.
Hello,
I need some help with these light splotches that you can see on the images attached.
I have already tryed to turn down the “FireflyClampingThreshold” from 10.000 to 100, with any difference at all in the results
The light quality is set to “Production”, and the gpu lightmass settings to extreme
They only appear around the direct light that is comming trough the windows, the rest is clear without any light splotches…
Thank you very much in advance!!
Hi
I have been using GPULightmass for quite some time and I have never had any problems, I am using Unreal 4.22.1 and the following message appeared after doing the build.
<None> === Lightmass crashed: ===Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xcf581000
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xcf581000
0x00007ffefa36dab0 nvcuda.dll!UnknownFunction ]
0x00007ffefa36dc8b nvcuda.dll!UnknownFunction ]
0x00007ffefa459acf nvcuda.dll!UnknownFunction ]
0x00007ffefa55e868 nvcuda.dll!UnknownFunction ]
0x00007ffefa45a4ad nvcuda.dll!UnknownFunction ]
0x00007ffefa32e7f4 nvcuda.dll!UnknownFunction ]
0x00007ffefa333416 nvcuda.dll!UnknownFunction ]
0x00007ffefa32bc4a nvcuda.dll!UnknownFunction ]
0x00007ffefa4bea92 nvcuda.dll!UnknownFunction ]
0x00007ffeac2bf535 GPULightmassKernel.dll!UnknownFunction ]
0x00007ffeac2bedb0 GPULightmassKernel.dll!UnknownFunction ]
0x00007ffeac2bff8a GPULightmassKernel.dll!UnknownFunction ]
0x00007ffeac2b3b8c GPULightmassKernel.dll!UnknownFunction ]
0x00007ffeac2b3b09 GPULightmassKernel.dll!UnknownFunction ]
0x00007ffeac2b2c71 GPULightmassKernel.dll!UnknownFunction ]
0x00007ffeac2cc7bf GPULightmassKernel.dll!UnknownFunction ]
0x00007ff7f09d983f UnrealLightmass.exe!UnknownFunction ]
0x00007ff7f0a46ab6 UnrealLightmass.exe!UnknownFunction ]
0x00007ff7f0a16ec0 UnrealLightmass.exe!UnknownFunction ]
0x00007ff7f09cbb64 UnrealLightmass.exe!UnknownFunction ]
0x00007ff7f09ef36d UnrealLightmass.exe!UnknownFunction ]
0x00007ff7f0a0e4da UnrealLightmass.exe!UnknownFunction ]
0x00007ff7f0a81bb8 UnrealLightmass.exe!UnknownFunction ]
0x00007fff31fe7e94 KERNEL32.DLL!UnknownFunction ]
0x00007fff34ad7ad1 ntdll.dll!UnknownFunction ]
I don’t know what’s going on, if someone could guide me to know why this is, I’d really appreciate it
There is not enough memory to build the lights, try reducing some lightmap resolution that might be eating lots of resources
thanks for the explanation