• A simple rectangular face has one contour and four edges.

• A contour will traverse a boundary such that the part face is always on the right-hand side (RHS). For an external contour, the direction of traversal is clockwise. For an internal contour, the direction of traversal is counterclockwise.

• If a part is extruded from a sketch that has a U-shaped cross section, there will be separate surfaces at each leg of the U-channel.

• If a part is extruded from a sketch that has a square-shaped cross section, and a slot feature is then cut into the part to make it look like a U-channel, there will be one surface across the legs of the U-channel. In other words, the original surface of the part is represented as one surface with a cut through it.

• Geometry traversal happens on body, solid surface and contour. For quilts, datum curves, edges, the geometry traversal will happen through a solid. To collect all the bodies in a specified solid, use the function ProSolidBodiesCollect().