Follow this procedure only if you are very early in the design cycle with a model having a minimal number of objects detailed in the Structural Detailing task. Otherwise, follow the procedure described in Swap Hulls on a Detailed Model Using Molded Forms Delay.
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Click Select on the vertical toolbar.
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Select Molded Forms (Root Level) in the Locate Filter.
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Select the existing hull in the model.
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On the ribbon, select File Definition .
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Select the .SAT or .IGS file that contains the new hull to import.
To show .IGS files in the file browser, you must select IGES files (*.igs) as the file type.
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Click Open.
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If you are importing a hull from an .IGS file and the file defines only half of the hull, click Mirror surface , Mirror reference curves , or both to import a complete hull.
By default, the two mirror options are disabled. A preview for the hull is updated automatically when you click Mirror surface
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Click Finish.