Temporal AA artefacts

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Yeah, youtube screwed up for no reason… Its around 00:47 in the video… the sidewall of the staircase.

Here is a still from the footage:

Yeah. I had changed that to 0 after taking the screenshot. Even with 0 it still occurs.

The textures have all mips. The skylight is the same from the template.

By the way: I have experimented a bit with No TAA vs FXAA vs TAA.
There are some peculiar effects, even on bare black materials.
Some occur with FXAA but not with TAA and vice versa.

Ill make another video tomorrow (its getting late on this side of the planet) to show the various combinations.
Maybe that even helps figuring out whats going on.