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Before exporting a Revit project to IFC, you may need to map generic family instances to IFC containers (element types). You do this by creating a new IFC mapping file or editing an existing one. Also, you can use the following procedure to load the desired IFC mapping file before exporting a Revit project to IFC.
To load and modify an IFC mapping file
- Click ExportOptions (IFC Options).
- In the IFC Export Classes dialog:
Each row in the dialog represents an element category or subcategory. For standard building elements, an assigned class name appears in the IFC Class Name column. For building elements that do not have automatic mapping to IFC export classes, ”Not Exported” appears in the IFC Class Name column.
- For each category or subcategory to export:
- For IFC Class Name, enter the name of the IFC class for the particular category/sub-category pair.
- For Type, enter the type of object within that subclass.
Appropriate values are set according to the IFC standard definition. Selecting Not Exported prevents elements of that category or sub-category from being exported.
If the values for a category or subcategory are blank, Revit will try to determine the appropriate category. If it cannot make a match and the object has geometry, it is exported as a proxy object.
- To save the settings:
- To save the settings in a new IFC mapping file, click Save As, navigate to a target folder, and enter a new file name. Click OK.
- To save the changed settings in the existing IFC mapping file (whose file name appears in the dialog’s title bar), click OK.
When you export a Revit project to IFC, Revit automatically uses the appropriate IFC mapping file.