Since version 4.3 (preview), use the volume Light propagation system crashes the software. To reuse the Unreal Engine, you have to restart the system.
As in the tutorial and earlier versions, the command line “r.LightPropagationVolume = 1” was added to the file ConsoleVariables.ini
Do you have a solution to fix this problem, please?
Same Problem here.
Actually I am using a trick to “simulate” the lights inside buildings, the result is pretty good, but the result in GI was better, in 4.2. It’s a shame to swap a light system against a tree system. Because we need both of them.
Hey
I actually reported that issue quite a while ago:
And one of users provided solution how to fix it and also pull request on github.
Hi Shinje
Thank you for your report. I will begin investigation into this issue as soon as possible. To begin with I want to gather a little bit more information from you. Did you use an existing project to crash or have you tried a sample project? Can you be as detailed as you can about the steps you took to go from launch engine to crash?
In the meantime, please be sure to review our suggestions for how to report a bug, and feel free to edit your post if you have additional information to provide:
How do I report a bug? - Programming & Scripting - Unreal Engine Forums
Thank you.
Eric Ketchum
For me, I tryed both, my own project and a 3th person shooter BP template.
In both cases, IF r.LightPropagationVolume = 1 when try to add a Directional Light Movable on viewport, the system freezes, and only with hard reset to resolve.
The steps are on my tests are:
1 - put r.LightPropagationVolume = 1 on ConsoleVariables.ini
2 - Open any template.
3 - Delete All lights from scene, skydome or atmospheric fog
4 - add a Directional Light Movable on scene
5 - System Crash
As I wrote in your subject, it doesn’t work.
Did you recompiled engine from source and edited shader files ?
Your Solution already applyed on 4.3 branch. I Cheked yesterday.
I just checked github source on 4.3 branch and it still not appiled to it 
More we need to claim that. If 4.3 release comes with this bug, i cant go on with my work.
@iniside:Yes, i recompiled both of them.
@: Actually you can work without GI, and, later, you will use it again. When it’ll work.
The same but I try without.
The same again. I created a light system to remplace GI but the result is not perfect.
I cant continue with my work without GI. The next step is GI + Speed tree. I need GI on 4.3 release.
My work is based with GI tweek. here.
Hi Shinje -
Thank you for your help this is most definitely a bug. I have logged it with our engineers and I will keep you appraised as we work on this issue.
Thank You
Eric Ketchum
Thanks to you, Eric
This bug has been fixed in main, and is being considered for a 4.3 hotfix. The code changes have been posted in the other thread if you want to try them out yourself.