How It Works

• Solid authoring uses flat arrays for triangles and per-triangle face labels. Windings are made consistent and orientation is fixed by signed volume before building a Manifold.
• manifold-3d produces robust manifold meshes while propagating face IDs through CSG, keeping selections stable after unions, differences, and intersections.
• Faces and edges are visualized with Three.js helpers. Face names remain accessible for downstream feature logic and PMI annotations.