Origami Software from Scratch
summary
A yearlong build starts from the claim that crease patterns are planar graphs and becomes runnable JavaScript/TypeScript tooling on origami.pw The stack implements face-walking, reflection matrices and adjacent-face trees to simulate flat folding, validates nodes with Kawasaki's theorem, and encodes the Huzita-Justin axioms for construction. The main engineering surprises are epsilon precision bugs, needing custom 2D geometry, and that the library actually folds user designs and exported Voronoi crease patterns for cutting and creasing.
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