Animation - object rescales while moving ?!

Hi guys i have this problem. While rotating any of the meshes they keep resizing. I’ve imported the model from 3ds and this problem occured. It happens when i simply rotate in editor and when im trying to animate. It also happens when i import the animation from 3ds . It never happened to me before, is something wrong with the meshes ? The pivot is moved in 3ds max aswell

Could anyone help me solve this problem ?

Thank you

You have non-uniform scales in your hierarchy (in your screenshot I can see a non-uniform scale on the object you’re rotating, but I bet it’s Parent has one too)

This is something you need to avoid for animation, as it will cause these distortions. If you built the model in 3DS MAX, you will want to un-parent objects, Reset XForm and re-parent them. Then you should be able to animate without distortion.

Thank you , that solves the problem !

For those having the same problem and never heard of xform (as me), this video + FlaxSycle’s post is all you need for fixing this :

http://www.mrbluesummers.com/933/video-tutorials/reset-xforms-monday-movie