Function dist2_2

perro_source/render_stack/perro_meshlets/src/lib.rs:710–712

(a: [f32; 2], b: [f32; 2])

    remove: u32,
    metric: SimplifyMetric,
) -> f64 {
    let Some(keep_v) = vertices.get(keep as usize) else {
        return f64::INFINITY;
    };
    let Some(remove_v) = vertices.get(remove as usize) else {
        return f64::INFINITY;