🦢 Origami Folding — 2D Crease Pattern Simulator

This 2D companion builds the same rigid-origami facet geometry as the 3D version — Miura-ori, Yoshimura, Kresling and the waterbomb base, each as a set of triangular/quadrilateral panels lifted out of a flat plane by sin(fold) — but rotates and projects those 3D points onto a plain Canvas 2D surface with a hand-rolled rotate/perspective pipeline and painter's-algorithm depth sorting, instead of handing the scene to WebGL. Drag the canvas (or use the rotation and tilt sliders) to orbit the folded structure and watch the mountain (red) and valley (blue) creases sort themselves in front of and behind one another.