Return an independently-disposable duplicate of a shape.
downcast is a cast, not a copy: on the occt-wasm arena kernel a
same-type downcast returns the very same handle id, so disposing the
"copy" would free the source. copyShape guarantees a handle that can be
disposed without affecting the source — a real geometric copy where a
primitive exists (occt-wasm k.copy), or the safe existing duplicate on
kernels that never free handles individually (brepkit/manifold) or share
refcounted geometry (occt Embind).
Downcast a shape to a more specific type (e.g., TopoDS_Shape → TopoDS_Edge).
Optionaltype: ShapeTypeGet edge-to-face adjacency map as JSON.
Compute a hash code for a shape (used for face tracking).
Test if two shapes are geometrically equal (same location + orientation).
Check if a shape handle is null.
Test if two shapes are the same topological entity.
Iterate a TopTools_ListOfShape, calling a callback for each item.
Sew shapes together at shared edges.
Optionaltolerance: numberGet the orientation of a shape (forward, reversed, internal, external).
Get shared edges between two faces.
OptionalsubCount sub-shapes of a type without allocating a handle per sub-shape.
Optional native fast path (occt-wasm >= 3.7.0); absent kernels fall back to
iterating handles. See the topology-layer subShapeCount wrapper.
OptionalsubDeduplicated sub-shape hashes at hashUpperBound, with no per-sub-shape
handle allocation. Hashes agree with hashCode at the same bound.
Optional native fast path (occt-wasm >= 3.7.0). See the topology-layer
subShapeHashes wrapper.
Get faces adjacent to a given face within a shape.