I’m talking about things like [Merida’s eyes being all buggy when animating Brave](https://www.youtube.com/watch?v=4405qEhBmEM) or [everyone’s hair going in weird directions in The Incredibles](https://www.youtube.com/watch?v=Y_MQnH54XaA) or [Shrek’s arms suddenly getting really long](https://www.youtube.com/watch?v=UNngNiYXuVE). Why does the animation fail in (apparently) random and uncontrollable ways?
In: Technology
Simplifying what others have said, all the 3d objects involved in an animation have rules for how they should move.
If the rules or timing for one object are off and it gets out of sync vs. the ones around it, that can produce weird visual effects.
You see similar effects in real-life for things like dances that rely on very precise choreography.
“Thousand-hand Bodhisattva” is an extreme form of this where multiple people stand behind each other to give the illusion of a single person with many hands:
[https://www.youtube.com/watch?v=-nMOJZhLm2k](https://www.youtube.com/watch?v=-nMOJZhLm2k)
If someone in the middle has their timing just a little bit off and leans to one side out of sync with everyone else it ruins the effect.
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