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OBJ ImportKeyCreator \ File \ Import \ OBJ-Import
This function allows you to import polygon meshes from an obj formatted file as shell entities. OBJ was the original format of Alias Wavefront and is now a common exchange format among polygon mesh based 3D modelers and rendering programs.
Rendering options apply to Shell entities the same as solids and surfaces. Closed Shell entities are also supported by the Mass Properties function.
Shell entities generally use less memory than solids but complex shapes with large amounts of detail can result in shells with very high face counts which will use more memory.