Wednesday, 17 Jul 2024

Eyes and Teeth Alignment Issues on 3D Models

Have you ever encountered issues with your 3D models where the eyes and teeth don’t move properly with the head? Or perhaps the arms move in a strange way? Fear not! We’re here to help you troubleshoot and fix these common problems.

Understanding the Issue

The root cause of this problem lies in the way the eyes and teeth are attached to the model’s bones. In many cases, the eyes are parented to the head bone and have a copy rotation constraint on them targeting the eye bone. This setup is intended to make the eyes move as the head bone moves and also rotate as the eye bones rotate. However, this can lead to confusion and improper movement.

Fixing the Eyes

To fix the misalignment of the eyes, follow these steps:

  1. In the armature panel, put the armature into ‘Rest Position’.
  2. Select the eye mesh objects and clear their parents (use the “Alt + P” shortcut).
  3. Shift-select the armature and enter pose mode.
  4. Select the eye bone and use the “Ctrl + P” shortcut to parent the eyes to the bone.
  5. Remove the copy rotation constraint from the eye mesh objects.
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After performing these steps, the eyes should only be influenced by the eye bone. This ensures that they move and rotate correctly, according to the intended animation.

Additional Fixes

While addressing the eye alignment issue, it’s worth noting a few other common problems that you may encounter:

  • Arm IK Controllers: If the arm IK controllers are unintentionally influencing the mesh, you can resolve this by moving them far away from the mesh. Remember to uncheck the “Deform” option in the bone panel for any bone that should not deform the mesh.

  • Mesh Deform Modifier: If you have applied a mesh deform modifier to the eyes, it’s important to remove it as it is not necessary. Similarly, remove the modifier from the main mesh until you are ready to use it. This will avoid confusion and streamline your workflow.

  • Leg Rigging: The legs may also require some adjustments. Consider using pole targets on the IK constraint for the lower leg to control the knees, instead of relying on IK constraints on the thigh bones.

  • Eye Constraints: Instead of using IK constraints on the eyes, try using track-to constraints. Keeping it simple and using only what you need can help improve the overall efficiency of your rig.

Frequently Asked Questions

Q: Why are the eyes and teeth not aligned properly in my 3D model?
A: The misalignment is typically caused by incorrect parenting and bone constraints. Properly parenting the eyes and teeth to the bones and using appropriate constraints will fix the issue.

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Q: How can I ensure that the bones influence the mesh correctly?
A: Make sure to enable the “Deform” option in the bone panel for bones that should deform the mesh. Conversely, bones that should not deform the mesh should have this option unchecked.

Q: Are there any other common issues I should be aware of?
A: Yes, some other common issues include unnecessary modifiers and complicated leg rigging. By following the steps outlined above and considering the additional fixes, you should be able to resolve many of these issues.


In this article, we have discussed common problems related to eyes and teeth alignment in 3D models. By understanding the root causes and following the suggested steps, you can ensure that your models move and deform correctly, creating realistic animations. Remember to keep it simple and only use what you truly need in your rigging process.

If you encounter any further issues or have any additional questions, feel free to reach out to us at Eireview. We are here to assist you on your journey through the world of 3D modeling and animation.