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BSpline BRep Faces

Faces (patches) are the smooth connected pieces of surface of BSpline BRep objects

Faces are parametrized with two parameters (u and v). Ranges of the u,v parameters (parameter rectangle) are specific to each patch

A face can be closed in one (a cylinder) or both (torus) directions.

With the simple (natural) parametrization above a face is a deformed and stretched rectangle. To model more complicated patches like triangular or polygonal curved patches or patches with holes a face can have trimming wires applied to the surface of the natural patch. For example a rectangle with a hole has two wires: The external (natural) one and internal trimming wire, defining edge of the hole.

Properties of a patch, including parameter ranges, 3D coordinates of a point defined by parameters, etc can be obtained via IKO_BRepGProp_Face interface queried from the relevant IKO_TopoDS_Face,, IKO_TopoDS_Shape or IKO_TopExp_Explorer

See also: Shape Explorer Sample