Beloch

Beloch is a declarative language for origami. You describe a sheet of paper and the creases you want in terms of the points and lines on it; Beloch works out the exact geometry and hands you back a crease pattern and a folded state.

New here? Start with the tutorial — it builds a small program up one line at a time. Or try the language right now in the Playground.

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4; diagonals.bel
paper square
mark through .a .c
mark through .b .d