After several unsuccessful attempts at having AO after baking the lighting, I cranked Exponent to 4 just to see if there’s ANY AO at all and maybe it’s just barely visible. But no.
As you can see, there’s literally no AO whatsoever:
I’m really confused about what’s going on. Because I specifically remember using this feature several times in the past and everything was fine.
And yeah, I checked project settings and AO is enabled.
For current project, I am using SSGI, so post-process AO doesn’t work.
If I disable SSGI, post-process AO works (but still doesn’t show in AO visualization mode) and baking light with “Use Ambient Occlusion” in lightmass settings don’t do anything.
So either way lightmass AO doesn’t work for some reason. And something wonky is going on with occlusion visualization mode.
I do have global post-process volume. However, I am using SSGI on this scene, so post-process AO don’t do anything.
What’s weird and confusing, is that even if I disable SSGI, I still can’t see AO in occlusion visualization mode, even though occlusion is clearly present on the scene and I can see it and tweak it in “Lit” mode.
And in either case enabling AO in lightmass settings and baking light doesn’t do anything at all.
Oh so baked AO also does not work with SSGI? Alright, thanks!
SSGI is indeed costly, but I tried experimenting with it and found out that there’s little to no difference visually when changing SSGI quality from the default 3 down to 1. Yet performance is MUCH MUCH better.
And yeah, something is wrong with AO visualization, because all I can see is white when using it. While the scene itself is getting correct occlusion in “Lit” mode. That’s what confused me, I thought I was doing something wrong and my AO doesn’t work properly or something.
I can assure you Postprocess AO and SSGI would not work together, you can use either one SSAO (Post-processing AO) or SSGI. SSGI kinda more accurate and doing its own AO and costly too. if you wanna combine them together that you need to change from the source. Even if you are working with baked lighting does SSGI replaces that. But I am still unsure about the wrong with AO from G-buffer. I had the same issue once before I guess, but I cannot really memorize what I have done, I would suggest you port the project to another engine version if you are arranged with your level assets.
