Hello, I just built my lighting and everything either got green painted all over it, or has immense green emissive light that fills the screen. (This is a mid-day snow map, so it is normally all white+blue)
Any ideas why this happened or how to fix it?
Thanks!
Just turned all the Global illumination off via a post process and that got rid of the immense green light, but now the scene has no GI lol.
Any ideas how to fix the broken GI? Thanks!
Delete and recreate reflection capture actors in the level and see if it helps. If not, make sure your GPU driver is updated.
Hi Jacky, I have deleted the 2 reflection capture actors in the scene, and I deleted the Skylight (saw that in another post) then I rebuilt the lighting. Nothing has changed. (Yes my gpu is fully up to date)
Here’s another view of the scene. I’m setting Global illumination intensity to 0 and 1 through a post process so you can see the problem. Also notice that some objects are oddly painted bright green, even though it’s a snow scene with no green textures. So I think there’s problems with the GI color map? I just can’t figure out how to fix the GI.
Edit:
Also, here’s a screenshot with the ‘Lighting only’ viewport. This is the one angle I could get without the light blowing out the screen like above. (Those are a bunch of brown rocks, which for some reason have tons of super emissive green GI sploches on them.
Hello Juice-Tin,
In order to understand this issue better I would like a little more information from you.
1.) Can you link a copy of your DxDiag?
2.) Does this happen in 4.10 or 4.8?
3.) Is this the only project this happens in?
I have seen similar issues to this but the fix to this was making sure the users graphics card was up to date. As you said, you have already done this and this did not fix the issue. After I have this information I will continue to investigate this issue at that time.
Thanks for the response ,
If this may help, here are the last actions that were taken which may have led to this problem.
So in short, the level + a few assets were created on AMD Radeon using Unreal 4.9.1, the whole project was sent to an NVidia using Unreal 4.9.2, then sent back via uasset to my Radeon 4.9.1. The lighting built just fine on his machine, but his level now goes green when built on my machine. The original level I created builds just fine, only the version that was sent to his Nvidia then back to me is broken.
Not sure if any of that helps, but hopefully it can be of some use. 
Also, I’m happy to give out any extra information/screenshots/etc that you may need.
Edit:
I rebuilt my original test level and now it too is showing some green Global illumination. This area is just 2 white snow rectangles, the whole scene should be a snowey blue+white yet there is the green GI again.
Edit2:
I built my colleague’s project as well as some others from the marketplace, all the lighting built just fine. The problem is only with my main project (probably from when I copied some content from the other project to mine) Could you recommend any workaround fixes?
So, you can try deleting your “Intermediate” and “Saved” folders from your Projects directory. This will force the engine to recompile all of your textures/materials/ and ask you to rebuild your lighting.
Make a copy of your project before you do this
This way you have a test to work with.
Let me know if this fixes your issue.
Hey , I deleted Saved and Intermediate, however these did not affect anything. All lighting/materials/etc was still built when the project opened. (Also, I’ve upgraded the project to 4.10)
Is there perhaps another folder/file I need to delete to force the recompile?
Derived Data Cache. That’s the last one I feel comfortable suggesting to delete.
Hey , I deleted that as well as Intermediate and Saved again, both from my project folder and the Unreal Appdata. No changes.
I’ve found a very temporary solution. By setting all the GI settings to extremely low in the world settings, it fixes the crazy GI and I can see my project again, however the lighting is very poor now and still has oddly colored artifacts.
I can work with this for now, but will soon need proper lighting. Again, I’m not sure if you’re actively trying to figure out this bug or not, but if you are I’m more than willing to help in any way I can!
Thanks.
Well There is really nice answers, but what I’m gonna tell you is same situation that I had.
I had red colour issue like you after lightmap baking and it was from the substance designer plugin.
And I fixed after I delted that plugin involved material’s emmissive radius.
I see that you figured out something to temporarily allow you to work. Would you be willing to share a test project or this one and I can delve into what may be causing this on my computer? Those steps to force your project to rebuild lighting and textures from scratch was really my only thoughts on how to fix it without looking at how you have certain settings setup.
Hi , thanks so much for your help! The current project is over 30gb, so tomorrow I’ll create a much smaller stripped down version that can be transferred more easily. I’ll also be trying it on other PC’s tomorrow as well.
Thanks again!
Not a problem. You could also check MeepMeep’s suggestion and try disabling the plugin before going through all of the hassle of creating a test project.
I’m not using that plugin or any others for that matter. Also happened on a completely fresh install of Unreal without any engine modifications. But good to know if I ever grab that plugin, thanks!
I just sent the project with details to your forum private messaging as I can’t post the project publicly.
Thanks!
Ok, so this deals with the lighting cache and exceeding the cache limits.
There are two ways to fix this.
After restarting the editor, because these steps will require you to, and the editor recompiles then the green light disappears. No worries about the dynamic lighting either as it actually improves the fps of your project by 30-40 fps in some places.
