How to remove weird pixels from previous rendered frame?

I’m using 3rd person character template as base project (originally from previous version). I’m experiencing strange behavior - if I move with character, I see something like character position from previous frame (see images and video below).

Elements visible after movement (character is turning to the left)

You can see pixel elements better in captured video on YouTube [- YouTube][2].

And this is material settings:

Why is this happening and how I can get rid of it? It seems that PostProcess volume does not have any effect on it.

This is an artifact related to Temporal Antialiasing. The quickest, easiest way to get rid of this bug is to just turn off TAA or switch to FXAA, which doesn’t have this artifact.

If you absolutely need TAA, you can reduce the effect by using materials that aren’t as visually “noisy.”

Hope this helps.

Oh my, switching to FXAA definitelly solved this issue. Thanks a lot.

What is the reason to be defaultly selected as AA method? Is it because Epic presumes that you have machine powerfull enough to run TAA without getting that artifacts?

Actually it has nothing to do with how powerful your machine is. Epic likes TAA because it allows them to do a lot of interesting effects, but many people find it to be the inferior AA method, and those effects are for more advanced use. I’m not sure why it’s the default.