Booleans about twice as fast: point-in-mesh tests through a per-direction grid (sampling checks), one mesh of the result for both its volume and membership checks, operand volumes from their meshes, and the intersection tried at the coarser tolerance first (oracle run 10 → 5 minutes); free-form faces merge in the topology counts when their normals agree within 2.5°

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/kernel/src/topo.rs

@@ -411,7 +411,7 @@ pub fn merged_topology(b: &Body, mesh: &Mesh) -> Result<TopoCounts> {
             match (sa.search_nearest_parameter(q, None, 50), sb.search_nearest_parameter(q, None, 50)) {
                 (Some((u, v)), Some((s, t))) => {
                     let (x, y) = (sa.normal(u, v), sb.normal(s, t));
-                    x.x * y.x + x.y * y.y + x.z * y.z > 1.0 - 1e-4
+                    x.x * y.x + x.y * y.y + x.z * y.z > 1.0 - 1e-3
                 }
                 _ => false,
             }