Constraints for the eyeballs control

I control the animation of the eyeball using some "Constraints".

・Fix the eyeballs to "Empty" with "Copy_Location". ("Empty" is set as a child of "Bone_Head")

・Create a controller for the eyeball and use "Damped_Track" so that the eyeballs always faces the controller.

・The controller has a structure that can control the left and right eyeball separately.