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
None of these answers are ELI5. The simplest and most concise explanation is that, software is buggy, 3d animation is complicated, and sometimes the tool does something you don’t want. For the animators, especially the more technical animators, it can often be a battle to make it *not* a mess. Simulations for things like hair and water especially can be finicky and require multiple attempts to get right.
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