Function normal_dot_after

perro_source/render_stack/perro_meshlets/src/lib.rs:655–663

(vertices: &[LodVertex], before: Option<[f32; 3]>, after: [u32; 3])

        edges.iter().filter_map(score_edge).collect::<Vec<_>>()
    };
    out.sort_unstable_by(|a, b| {
        a.cost
            .total_cmp(&b.cost)
            .then_with(|| a.keep.cmp(&b.keep))
            .then_with(|| a.remove.cmp(&b.remove))
    });
    out
}

fn build_topology(vertices: &[LodVertex], triangles: &[[u32; 3]], scratch: &mut SimplifyScratch) {
    for (tri_index, tri) in triangles.iter().enumerate() {
        for (a, b) in [(tri[0], tri[1]), (tri[1], tri[2]), (tri[2], tri[0])] {