Docs · Exporter
Export settings
The plugin exports one fixed configuration, the georef preset, so every export is BMC-compliant. A few things can be changed in the Export IFC dialog.
What you can change
| Setting | What it does |
|---|---|
| Output | Where the IFC is written |
| Scope | Entire model, or only what is visible in the active view |
| Mapping | None, the built-in IFC+SG (BMC) mapping, or your own property-set mapping file |
| Georeference | EPSG code, read from the model. Singapore sets Autodesk’s SVY21 values |
| Use cache | Re-export from the cache when the model has one |
| Linked files | Export linked models as separate IFCs (in progress) |
Your mapping file is imported only for the export, in a transaction that is rolled back, so the model is never changed.
The fixed preset
| Setting | Value |
|---|---|
| Schema | IFC4 Reference View, Architecture |
| Phase | The model’s last phase (the view’s phase for view exports) |
| Common property sets and base quantities | On |
| Steel elements | Included |
| Internal Revit property sets, material and schedule property sets | Off |
| Tessellation level of detail | Low (0.5) |
| Triangulation only | On: triangulated face sets |
| Site placement | Project base point, with the site elevation |
| Map conversion and projected CRS | When an EPSG code is set |
| Address | Assigned to the building |
| Rooms, areas and spaces | Always exported |
| Space boundaries | Off in this version |
| Store IFC GUIDs in the model | Off (see duplicate GUIDs below) |
Singapore (SVY21)
The Singapore button sets exactly Autodesk’s own IFC+SG preset values:
| Field | Value |
|---|---|
| EPSG | EPSG:3414 |
| CRS name | SVY21 |
| Description | SVY21 / Singapore TM |
| Geodetic datum | SVY21 |
| Map unit | Metre |
Visible in view
Exports what the active view shows, as Autodesk does: a 3D view (only what is inside its section box, if it has one) or a plan view. Sheets and schedules are not exportable views. Phase and design options follow the view. Geometry is always read at Fine detail, so shapes are the same as in a full export.
Duplicate stored GUIDs
If two elements share a stored IFC GUID, the IFC still gets unique GUIDs: the same order and fallbacks as Autodesk, with repeatable replacements where Autodesk is random. The export log lists them, and the plugin asks:
5 elements had duplicate IFC GUIDs.
The IFC uses new GUIDs for them.
Save the new GUIDs to the Revit model? [ Save to model ] [ Cancel ]Save to model stores them on exactly those elements, so the next export has no conflicts and the same GlobalIds. Cancel writes nothing.