| @ifc-lite/drawing-2d | patch |
|---|
Reconstruct per-layer section fills from open (cap-free) material-layer bands. The geometry slicer no longer caps the layer interface planes — capping doubled each shared interface into a coincident, non-watertight "ghost face" sheet and ~tripled the triangle count on layered walls. With the interfaces left open, the 2D section's polygon loop builder is now bidirectional so each open band closes at the interface chord, keeping per-layer fills identical.