Votes
0
Product:
Character Creator 2
Version:
2.0
Status:
Closed
Issue 2189
Character creator and UE4 root motion problem
I seem to have a problem when using the characters with root motion in UE4. I'm not sure if it's something I've done wrong or if there is a problem with character creator.

When I play any of my root motion animations on a character there is a small amount of foot sliding. If I use the UE4 mannequin or any of our other characters on the same skeleton it doesn't slide at all.

To reproduce:

1) Start a new third person template project.
2) Make a character and export with the UE4 rig.
3) Import it to the Unreal project and select the UE4_Mannequin_Skeleton.
4) Apply any animation with root motion.

I made a couple of videos showing the same animation played on the mannequin and then a character made with CC 2.0 so you can see the difference:

https://drive.google.com/file/d/0Bwmgq27g6M2fYUY4bDU1X3IyNGc/view?usp=sharing
https://drive.google.com/file/d/0Bwmgq27g6M2fQXVRUWdKbmtlNlE/view?usp=sharing
OS: Windows 10
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Submitted byCapricia
1
COMMENTS (1)
Feedback Tracker Admin 
Thank you for your feedback.

The foot sliding issue was caused by the proportion difference of the skeletons of the foot in various characters. If you don't set up IK in UE4 manually, the same motion applied to different skeletons with different proportion will result in a foot sliding. You can see the UE4 Mannequin in the video has a slightly sliding too.

The sliding problem can be reduced by modify the moving speed of the root.

Another possible problem is that the foot might sink into the floor, which requires IK to solve, or set the foot length and proportion in CC to as much as possible the same as the target skeleton.

Here are some information for your reference:

Official Document of IK:
https://docs.unrealengine.com/latest/INT/Engine/Animation/IKSetups/

A plugin in UE4 marketplace:
https://www.unrealengine.com/marketplace/2-bone-ik-foot-placement-system

A tutorial in forum:
https://forums.unrealengine.com/showthread.php?44288-IK-FABRIK-blueprint-tutorial-for-proper-foot-placement-with-capsule-collision

An example can be download in AnserHub:
https://answers.unrealengine.com/questions/514148/tutorial-advanced-ik-foot-placement-for-413-tutori.html

A detailed tutorial:
http://unrealdevelop.org/2016/11/15/ik-feet-placement-setup/?i=2

A Video show you how to control root moving speed in Blueprint, it is the first video of a complete video tutorial of foot placement:
https://www.youtube.com/watch?v=v1Kmee3X4rs

Hope these helps.

Reallusion
1