ISO 10303-214:2010(E)
A Face is a topological object corresponding to a piece of a surface bounded by loops.
A Face may have holes, each hole being bounded by a loop. A geometric surface is always associated with a Face. A Face has a normal N, and the tangent to a loop is T. For a loop bounding a Face, the cross product N × T points towards the interior of the Face.
A Face is a type of Detailed_geometric_model_element.
The data associated with a Face are the following:
The bound specifies the loop objects representing the boundaries of the Face.
See face to face_bound for the application assertion.
The face_geometry specifies the basis geometry of the Face that is represented by a geometrical surface.
See face to surface for the application assertion.
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