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Description:
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The model geometry refers mostly to classes that are derived from
ENTITY and reference underlying construction geometry classes. The model topology is the glue that holds the model together and references model geometry items to provide the geometric definition. The specific geometric definitions are typically a layer deeper in construction geometry. For example, the
FACE class is part of the model topology. It references the model geometry class called
SURFACE.
SURFACE references specific construction geometry surface types, such as the offset spline surface, the skin spline surface, etc.
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