## Animation general

[Pixar in a box](https://www.pixar.com/pixar-in-a-box)

### 12 Principles of Animation

[The Illusion of Life: Disney Animation by Ollie Johnston and Frank Thomas](http://a.co/aQdw3AS)    
[Understand the 12 principles of animation](https://www.creativebloq.com/advice/understand-the-12-principles-of-animation)    
[The 12 Principles of Animation (Pixar-ated)](https://vimeo.com/207384652)

## Blender animation 

(Unfortunately version 2.79. The concepts are the same, but the interface will be different.)

[Animate a mushroom](https://www.raywenderlich.com/52804/beginning-blender-tutorial-animating-rendering-mushroom)    
[Sebastian Lague videos](https://www.youtube.com/playlist?list=PLFt_AvWsXl0fEx02iXR8uhDsVGhmM9Pse)    
[Grant Abbitt](https://www.youtube.com/playlist?list=PLn3ukorJv4vvNIeMqu82PqM37Xnds5zAy)

## Procedural animation

[Better Explained: Intuitive Understanding of Sine Waves](https://betterexplained.com/articles/intuitive-understanding-of-sine-waves/)    
[The Nature of Code by Daniel Shiffman](http://natureofcode.com/book/chapter-3-oscillation/)

## Sample models

[https://sketchfab.com](https://sketchfab.com)

## USD

[Pixar's USD documenation](https://graphics.pixar.com/usd/docs/index.html)
[Apple's USDZ tools](https://developer.apple.com/augmented-reality/quick-look/)

## Quaternions

[Apple on quaternions](https://developer.apple.com/videos/play/wwdc2017-711/?time=1005)    
[Apple documentation](https://developer.apple.com/documentation/accelerate/simd/working_with_quaternions)    
[Performance of quaternions in the GPU](http://tech.metail.com/performance-quaternions-gpu/)    
[Letter from Sir William R. Hamilton](https://www.maths.tcd.ie/pub/HistMath/People/Hamilton/QLetter/QLetter.pdf)    
[Quaternions](http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/)

## Gimbal Lock

[Gimbal Lock Explained in 30 Seconds](https://youtu.be/N5PDboNJwks)