MetalByTutorials/08-character-animation/resources/references.markdown

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## 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)