For those having issues with importing animation that wobbles or jitters, before you go back touching your rigs try these settings in FBX import:
It took us one whole day to troubleshoot our issues with horrible animation wobbles we were getting on import. The FBX file itself was working fine tested in Unity, Maya and Max. We tested it in all frames settings and milliseconds as well as understanding delta time issues and interpolation errors that may come up, it was clean and working outside UE.
We went back and tested a million things on our rig, re-imported and re-exported countless times and it still never solved our issues. we altered import settings except the last two combinations, it was pure chance we unchecked and checked these two settings in that order specifically.
We are frustrated that we wasted a whole day when by default yet again Unity was importing FBX animations fine and yet again UE was giving us trouble (another issue related to morphs in my other thread that preceded this). We still don’t know what exactly changed with these settings and why these two setting are causing the wobbles on animated rigs and characters, The doc mentions something about removing zero value keys/curves but that could mean a dozen things.
If anyone can explain why this is so and why they aren’t set like this by default at least we can understand the cause better.
We are also always checking “use default sample rate” just to be on the safe side. in some cases it has produced more predictable results. So we just keep it on now.