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earcut-rs

A Rust port of the mapbox/earcut polygon triangulation library, implemented from scratch with some reference to donbright/earcutr.

Based on the latest earcut 3.0.0 release.
Designed to avoid unnecessary memory allocations. The internal buffer and output index vector can be reused across multiple triangulations.
(Experimental) An additional module, utils3d, can rotate 3D coplanar polygons into the 2D plane before triangulation.
License: ISC

Benchmarks

on Macbook Pro (M1 Pro)

Polygon	earcut.hpp	earcut-rs (0.4.1)	earcutr (0.4.3)
bad_hole	3.574 µs/i	4.623 µs/i	4.415 µs/i
building	397 ns/i	195 ns/i	604 ns/i
degenerate	142 ns/i	45 ns/i	206 ns/i
dude	5.061 µs/i	6.496 µs/i	8.096 µs/i
empty_square	195 ns/i	74 ns/i	331 ns/i
water	459.6 µs/i	574.5 µs/i	801.3 µs/i
water2	334.1 µs/i	393.9 µs/i	450.3 µs/i
water3	13.12 µs/i	19.21 µs/i	23.46 µs/i
water3b	1.340 µs/i	1.345 µs/i	2.165 µs/i
water4	81.48 µs/i	110.6 µs/i	154.1 µs/i
water_huge	6.906 ms/i	11.0 ms/i	10.90 ms/i
water_huge2	15.38 ms/i	23.60 ms/i	22.35 ms/i

(Earcutr 0.4.3 is not besed on the latest earcut.)