Ambient Occlusion Post Process not working?

Unity Engine
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1

Just updated to unity 2019.4.23 (built in renderer) and post process package 3.1.0 but it seems the ambient occlusion setting I was using doesn’t seem to do anything anymore.

There’s 2 options Scalable AO and Multiscale Volumetric AO.

The multiscale was the one I was using before the upgrade but turning it on and off doesn’t change anything anymore.

Only the scalable option seems to work.

2

Nobody that can confirm if it still works or not?

3

It’s broken. We filed a bug report and repro (Case #1324639) but have not had a reply from Unity QA yet.

If you want a quick fix you can replace the texture format checks in ‘Runtime/Effects/AmbientOcclusion.cs’ with the old versions. You can use the older ‘RenderTextureFormat.RFloat.IsSupported()’ style calls.

The relevant commit is here;
https://github.com/Unity-Technologies/Graphics/commit/393e5f9f32c5179230fe897e67ce5e873a4b5595#diff-d6fa5b0557b2789c8dbda20bed34ee79b4f54de4984f09c274f4c120a672865d

We automate this patch so it doesn’t keep getting overwritten when using/updating packages.

Update 16/4: QA replied and accepted the bug.

2 Likes
4

Just encountered this. Any updates?

5

No, no reply from Unity QA yet.

6

I had this issue of AO not working in my project. I was using Unity 2020.3.3f1 so downgrading to 2020.3.0f1 was the solution.

Might work for the rest of you, bit of a pesky bug to be honest.

7

Bump : Unity 2021. Last PostEffect version

8

No Ambient Occlusion on 2020.3.7f1 (LTS), built-in 3D and post FX 3.1.0

Edit: Seems to work when I set the mode to “Scalable Ambient Obscurance”.
Multi-scale Volumetric Occlusion (default) is not working for me, but I thinnkkk my iMac is compatible with Metal. So now I’m not sure if this is related to the original post…

Edit2: Hey hey, I checked an older project (Unity 2019.3.5f1) -
There is the effect is working on my Mac (mode set to Multi-scale Volumetric Occlusion).
And also: This unity Version gives me the option to set Metal Editor Support checkbox.

This checkbox is missing in Unity 2020 …

9

Try downgrading version to 3.0.3. That worked for me.

10

There is a fix in review for 3.1.1;

11

Doesn’t seem to work with Unity 2020.3.14f1 + PP 3.1.1, PC. Irony is that I only updated to 2020.3.14 to be on an LTS build. In general, does LTS mean more stable bug fixes, or less bugs fixed so as not to accidentally break things?

Edit: no, it works, just that “Ambient Only” started working (and so I turned it off).

1 Like
12

Hello everyone,

It wasn’t working for me until I started again and follow this steps:

  • Main Camera:
    — Create a new layer called: Post-Processing
    — Add Component → Post-process Layer
    — Set Layer: Post-Processing
  • Create new gameobject called PostProcessVolume
    — Add component: Post-process Volume
    — Set Layer to Post-Processing
    — Create new Post Process Profile
    — Check IsGlobal on
    — Add effect Ambient Occlusion
    — Intensity = 1
    — Advise! Be careful with the On/Off button, the effect is activated when On button is dark grey and Off is light grey

In my case, the 2 critical points were the layer of the PostProcessVolume object and the confusing On/Off button

Hope it helps!

Unity v.2020.3.14f1
Post Processing Stack v.3.1.1