§Extract the original geometry of a family instance
§Before cuts or joins have been applied
automatically
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§GeometryCreationUtilities - Construct basic solids
§CreateBlendGeometry()
§CreateExtrusionGeometry()
§CreateRevolvedGeometry()
§CreateSweptGeometry()
§CreateSweptBlendGeometry()
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§BooleanOperationsUtils - Execute a boolean operation
§ExecuteBooleanOperation()
§ExecuteBooleanOperationModifyingOriginalSolid()
§GeometryObject.IsElementGeometry
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Options m_options = new Options();
GeometryElement orginalGeo = instance.GetOriginalGeometry(m_options);