pub fn candidate_pairs(
a: &[[[f64; 3]; 3]],
b: &[[[f64; 3]; 3]],
) -> Vec<(usize, usize)>Expand description
All AABB-overlapping (i, j) pairs between a and b, sorted by (i, j) —
a drop-in for the all-pairs+bbox loop with identical output order.