Function offset_wire 

pub fn offset_wire(
    topo: &mut Topology,
    face_id: FaceId,
    distance: f64,
) -> Result<WireId, OperationsError>

Offset a planar wire by a given distance.

Positive distance offsets outward (away from interior), negative offsets inward. The wire must be closed and lie on a planar face.

Returns a new WireId for the offset wire.

This is a convenience wrapper that calls offset_wire_with_join with JoinType::Intersection.

Errors

Returns an error if the wire is not closed, the face is not planar, or offset produces degenerate geometry.