How to rotate a child object with animation

Hi, guys:

I've been hours trying to accomplish something easy (or it looked like). I have a character model with an animation imorted into unity. It works good. Now I want the head looks in the direction of a target, even if the model is being animated. The animations make the character turns left or right by 60 degrees. So I wrote this code:

Code (CSharp):

1. using UnityEngine;
2. public class CharBehaviour : MonoBehaviour
3. {
4.      public Transform head;
5.      public Transform torax;
6.      public Transform target;
7.      private Animator anim;
8.      private void Start()
9.      {
10.          anim = GetComponent<Animator>();
11.      }
12.      void LateUpdate()
13.      {
14.          Quaternion lookRotation = Quaternion.LookRotation(target.position - head.position);
15.          if (lookRotation.eulerAngles.y > 60)
16.          {
17.              anim.Play("Turn_right");
18.          }
19.          if (lookRotation.eulerAngles.y < -60)
20.          {
21.              anim.Play("Turn_left");
22.          }
23.          head.rotation = lookRotation * head.rotation;
24.      }
25. }

It works nice without the animation, the head indeed follows the target. But when I play the animation (lines 15-22), the object torax (grandparent of head) gets rotated by 60 degrees and the head is turned 60 degrees from the target direction (which is expected). I tried a lot of combinations after last line but none works. The head gets rotated in odd ways. If I do:

Code (CSharp):

1. head.rotation = torax.rotation * head.rotation;

It does not work. Using localRotation no matter where it doesn't work either. I'm aware I don't understand Quaternions intuitivelly, but afaik combining rotations is done by multipliying them. What am I missing? Any ideas?

 

Ok, I found the problem and the solution. The problem was character bones were imported into unity in different axis. Model was ok, but bones were not.
So the solution is: In the FBX export menu in Blender there is a pair of options: (Primary and Secondary Bone Axis). I set them up to Primary = Z axis and Secondary = X axis. That solved the problem of bones. Then I just changed the lookRotation stuff for head.lookAt(target).
Now it works perfect.