Books with code
- 3D Mesh Processing and Character Animation, R.Mukundan, 2022 Springer
- Character Animation With Direct3D, Carl Granberg, 2009 Course Technology
- Advanced Animation with DirectX, Jim Adams, 2003 Premier Press
- Real-time 3D Character Animation with Visual C++, Nik Lever, 2002 Focal Press
Textbooks
- Physics-Based Animation, Erleben/Sporring/Henriksen/Dohlmann, 2005 Charles River
- Computer Animation: Algorithms and Techniques, Rick Parent, 2002 Academic Press
There's lots of open source too
What is a character animation system? Is it something like AAlib?
https://en.wikipedia.org/wiki/AAlib
Books with code
- 3D Mesh Processing and Character Animation, R.Mukundan, 2022 Springer
- Character Animation With Direct3D, Carl Granberg, 2009 Course Technology
- Advanced Animation with DirectX, Jim Adams, 2003 Premier Press
- Real-time 3D Character Animation with Visual C++, Nik Lever, 2002 Focal Press
Textbooks
- Physics-Based Animation, Erleben/Sporring/Henriksen/Dohlmann, 2005 Charles River
- Computer Animation: Algorithms and Techniques, Rick Parent, 2002 Academic Press
There's lots of open source too