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There used to be a trick to setting up non spherical eyes that can be squashed and stretched while still being able to use "track to" constraints to animate where the eyes look, it would also work in Unity when exported with the fbx format.

It seems like when the "track to" constraints are applied it breaks the effect. I remember this working in older versions of Blender like 2.76 possibly I don't quite remember which one. Is there an alternative method that can be used with 2.79 or even 2.8?

Would love know another technique as I tend to work with cartoony characters. Google hasn't yielded any useful info for me. non-spherical eye rig test

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Duplicate eye rotate and rename it to TrackToBone. Parent it to the parent of eye scale. (For this test setup, it won't need a parent.) Leave the track to constraint on TrackToBone as it was.

Add a Copy Rotation Constraint to the eye rotate with the TrackToBone the target. Choose Local Space for both inputs.

local space constarint

The TrackToBone will do the tracking and the eye rotate bone will copy it's rotation in the local (deformed) space.

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  • $\begingroup$ Wow! thank you so much, this seems to be working. I also tried something with a "copy rotation" constraint but it didn't quite work out the way I set it up. Took your advice and added the "TrackToBone" exported as FBX and the rotation and scaling are animating as expected in Unity. $\endgroup$
    – It's Just Chris
    Commented Jun 28, 2019 at 16:02

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