Convert RFA to 3DS

Older visualization, game-asset, and CAD applications may require the legacy .3ds mesh format instead of Revit’s parametric .rfa family format. The dependable workflow is to export the family’s 3D view from Revit as .fbx, then save that mesh as .3ds in 3ds Max.

What the RFA format is

.rfa is Autodesk Revit’s family format. It stores parametric building components such as doors, windows, furniture, fixtures, equipment, materials, constraints, connectors, and type parameters. Revit users create and edit RFA files in the Family Editor; downloaded manufacturer components are also commonly distributed as RFA files.

What the 3DS format is

.3ds is the legacy Autodesk 3D Studio scene format. It stores polygon meshes, basic materials, cameras, lights, and transforms, so older renderers, visualization programs, and asset libraries can read it without BIM software. Its mesh, naming, material, and scene-data limits are substantially stricter than those of FBX, OBJ, or glTF.

How to convert the family

1. Install Autodesk Revit and Autodesk 3ds Max. RFA is a Revit document, not a generic polygon mesh, so a direct conversion to 3DS is generally unavailable.
2. Open family.rfa in Revit with File → Open → Family. If the component exists only in a project, open the project, select the component, and choose Edit Family.
3. Open or create a suitable 3D view. Set the required detail level and visibility, and hide reference planes, construction geometry, 2D symbols, and unwanted nested components. Use View → 3D View → Default 3D View when necessary.
4. Export the view with File → Export → FBX. Select the active 3D view if Revit asks which view to export, then save family.fbx. Menu availability and FBX export behavior vary by Revit release; use an Autodesk-supported exporter or an intermediate format such as OBJ or DWG if the installed release has no FBX command.
5. In 3ds Max, import the intermediate file with File → Import → Import, select family.fbx, and review the FBX import settings. Check units, scale, object orientation, mesh normals, smoothing, and material assignments.
6. Export the result with File → Export → Export, choose Autodesk 3D Studio *.3ds, and save family.3ds. Enable material or texture export when those options are available, then reopen the file in the target application to verify it.

Online conversion options

General-purpose online services do not reliably interpret RFA because they do not run Revit’s family and BIM geometry engine. After Revit has produced FBX, a service such as CloudConvert or Convertio may offer an FBX-to-3DS conversion, depending on its current format support; upload only non-confidential files and verify scale, meshes, and textures afterward. For private manufacturer or project content, 3ds Max is safer and provides more control than an upload service.

Quality and compatibility limits

The result is a tessellated representation, not the original BIM family. Revit parameters, constraints, connectors, schedules, categories, host relationships, nested-family behavior, and type data are discarded. Only geometry visible and enabled in the exported 3D view is expected to reach the intermediate file and the final 3DS file.

Revit appearance assets, procedural materials, decals, and texture paths do not map completely to 3DS. Keep image textures in a separate folder, relink them in 3ds Max when needed, and confirm the scene units in both applications. An incorrect unit conversion can make the imported model extremely large or small.

3DS is an old format with limited mesh and name capacity. Complex families may need to be split into several objects before export, and long object or material names may be truncated. If the receiving application accepts FBX, OBJ, or glTF, use one of those formats instead when preserving materials, geometry, or scene data matters more than compatibility with legacy software.