How to Fix Flickering Outlines

Development Programming & Scripting
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1

I am using a post processing material to create outlines. In certain instances, the outlines flicker and jitter really badly. In the video attached, I have a building with a rectangular trim running horizontally. The outlines are constantly flickering on this trim. I am using TSR AA, and have tried switching to FXAA, but that only fixes the flickering while standing still. I am using unreal engine 5.6. Has anyone run into this issue or know how to fix it?

Example Video: https://www.youtube.com/watch?v=kI-p2DE432U

2

It looks to me like Z fighting issue.
I think you are not using a Custom Depth Buffer because you want your outlines to be occluded when behind other objects. In this case make sure to offset the outlines a bit in front of the facade plain to avoid flickering.