kdbush
A Rust port of kdbush, a very fast static spatial index for 2D points based on a flat KD-tree.
Introduction: A dive into spatial search algorithms
Comparison of point and box spatial index libraries.
Usage
let points = vec!;
let index = create; // make an index
index.range; // bbox search - minX, minY, maxX, maxY
index.within; // radius search - x, y, radius