Blender - Rigify mesh Issue

Hello,

I have a mesh deforming problem in unity with my cow model rigged with Rigify.

Here's the animation comparison in unity and in Blender:

https://i.imgur.com/IfygOYE.gif

As you can see in Unity the face is very stretched, how can i fix this problem?

 

This is a squash and stretch issue. You can stretch most parts of the Rigify rig and that will work fine in Blender. However, when you export such a movement to a game engine you get the problems you get. The problem is in the bone hierarchy. I tried to explain the problem in this video.

If you find it interesting, I have a bunch of other videos around blender & game engines and we also made an addon that offers solutions to this problem.