There’s black halos around objects every now and then. (See attachments).
I’m sure this has been discussed before but I couldn’t find anything on the forums and my troubleshooting turned out nothing.
I haven’t found a common denominator for this “render artifact”. It seems to turn up every now and then.
I’d gladly elaborate more on my set-up, if needed.
I prepared a small clip that illustrates the issue better but as a new user I’m not allowed to upload animations, apparently.
My first thought is ‘ambient occlusion’ - which can be turned off in Project Settings, Post Process Volume, or temporarily in the viewport (Eye Dropdown → Search ‘Ambient’)
There’s also an ‘ambient occlusion’ view mode. (Buffer Visualization section in viewport View-Mode dropdown)
My second guess would be something involving Lumen.
Feel free to upload your clip/animation to Dropbox/Gdrive/etc and share a link here.
Here’s a link to the clip I mentioned: dropbox
(The clips is stylized but that appears not to be responsible for the issue. I chose the clip just because it illustrates the issue of the black halo very clearly).
I’ve begun troubleshooting Lumen as well, testing every Lumen setting and related CVar I could find by checking, unchecking, and adjusting them. Unfortunately, it hasn’t resolved the issue yet.
Cool animation, I see the ‘black halo’ around the red ribbon.
If you mouse over ‘Ambient Occlusion’ in the project settings it says that It can be overridden by Post-Process or Cameras, So I’d double check the settings those. (I imagine it’s using the settings from a cine camera when rendering the animation)
console command ‘showflag.ambientocclusion 0’ is worth a shot too.
For troubleshooting Lumen, try changing ‘Dynamic Global Illumination Method’ in Project Settings.
r.Lumen.Reflections.ScreenTraces was enabled, yes. Turning it off didn’t make a difference.
There is no information in the visualization buffer > ambient occlusion. I.e. it shows just white.
See attachment.
Ambient occlusion was off in the camera settings as well. Turning it on didn’t make a difference.
I changed the global illumination method in the project settings as well. In the same vein, here’s a crop from the same scene, pathtraced, for reference.
See attachment
The same crop rendered with lumen is also in the attachment.
In short, I haven’t managed to isolate the issue, unfortunately. Still, I appreciate all the suggestions.
I was able to find the issue I had with the other shot, though:
The culprit was the shadow contrast. (In camera settings):
Here’s the fixed version, in case anyone’s interested: DrobBoxLink
