Finbook is a flipbook authoring tool inspired by Flipbook, which lets users create animations frame-by-frame. However, the interface is primitive to use if you wish to redraw a slightly modified version of a previous frame. So Finbook tries to do the same thing but with support for as-rigid-as-possible shape deformation.
You can read the PDF below for technical details about how this works, or you can just try it out:
- finbook.pdf (506 KB): Technical writeup for Finbook. Describes algorithms and the math behind deformations, and has some screenshots.