I have multiple scenes where ambient occlusion does not seem to be working despite enabling all the features that it seems to need to work. I haven't ran into the issue before. 4.27.1, rtx280super
-All movable lights
-distant fields enabled in preferences, and generate distance fields on imported assets enabled
-I can see the distant field AO in the visualizer by itself, but not apparent in lit mode
-BUT, if I view lighting components>ambient occlusion, on or off makes no visible change, which makes me think its not working at all
So with everything enabled, I see no effect when I adjust AO settings on the skylight or the post process where its enabled.
Please help, any info would be appreciated. The only other topic I saw on this with any resolve was the person creating a new project totally. Can I force enable in the command somehow?
All right. Found the issue.
Using unreal engine 4.27.2 .
I was also having the same problem, AO not working after all I added the post process volume and tweaking the intensity .
Then I opened another project where screen space global illumination in disabled from project settings and noticed there AO intensity tweaking is working. As soon as I enabled the Screen space global illumination, AO intensity stopped working.
Looks like tweaking AO from post process volume doesn’t work if you enable screen space global illumination.
If you want to tweak AO from post process volume, Just disable SSGI from project settings.
It may be no the same issue, but if you arrived to this topic thru the title " Ambient Occlusion not working (movable lights)" because your HDRI backdrop and/or Skylight is not showing proper AO. You should set it to Static or Stationary, you will definitely have a better AO.