So I have been fighting this problem for two days and still, no solution found. I tried with brand new Unreal Engine projects, different IClone models and the newest version of the plugin and non seems to do anything.

The problem is this:
Whenever I Export an animation from IClone using Unreal Engine presets and then import the animation Unreal Engine, the model that plays the animation gets very twisted. I tried to import the animation with the same mesh it played inside IClone but the same problem still remains.

Here are the steps:
I apply animation to the model
67% of original size (was 753x772) - Click to enlarge

I Export as FBX using Unreal Engine presets:


In Unreal Engine I import using default presets:


The animation is distorted.
67% of original size (was 753x772) - Click to enlarge

Strange thing is that when I press import and get the Auto Setup menu and I disable using the auto setup, then the character and animation come normally and work, but as soon as I allow Auto Setup, the twisting happens. I tried to import the character using Auto setup and only animations without it, but that didn't work and twisting happens.
67% of original size (was 753x772) - Click to enlarge

So every help is much appreciated! Oh, and I guess I should mention that I tried to bring Unreal Engine mannequin to CC4, characterized it and put animation to it and that worked. The default CC characters have the problem.

Thanks very much! So all the CC4 characters should be imported with that setting enabled. Was that mentioned in some guidelines? I saw that when importing only animations, it is not possible to select that option, so what do you suggest to do with the characters already imported differently and which have some logic?

It is only important when importing the Skeleton Mesh so that it has the right pose for retargeting or adding animations.
Also be sure to tick "import Morph Targets" when using facial animations.

Hey, I had the same issue quite a few months ago. Indeed, the option "Use t0 as Ref pose" does wonders.

However, I'm still having an issue with the fingers, and I don't see where it could come from. They appear weird and distorted... Any hint on this ?

67% of original size (was 753x772) - Click to enlarge

Did you retarget this character?
Finger defect often occurs when retargeting is done incorrectly.
At least that's how it was for me.

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https://www.youtube.com/yepkoo
https://dev.epicgames.com/community/profile/bxvo/Yepkoo#learning

Well... I've TRIED retargeting ahah. In Unreal 5 I have absolutely no idea how to do so =(

Thanks for the quick reply btw.

Interesting, I've never had this problem.
Bassline303 may have information on this.

For retargeting, I used the rig file made by Epic Games for the UE4 character and I got very successful results.
You can try this.
All you have to do is open the UE4 rig file and apply the same to your CC character.
Hopefully RL adds automatic Rig generation with the last update.
This process takes a lot of time.

If you need it, I have shared my youtube videos on this subject on the following page before.
https://forum.reallusion.com/514090/Retargeting-Unreal-Engine-45-characters-with-CC4-characters


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https://www.youtube.com/yepkoo
https://dev.epicgames.com/community/profile/bxvo/Yepkoo#learning

Wow thank you for sharing this !! Will definetly look at this.