Convert RFA to OBJ

A Revit family must be converted when a mesh application such as Blender, a renderer, or an asset pipeline requires OBJ instead of Autodesk’s native .rfa format. The result is a static polygon model for viewing or editing, not an editable BIM family.

OBJ is also useful when recipients need geometry without Revit, but it removes the parametric and project-dependent behavior that makes a family reusable in Revit.

What the RFA format contains

RFA is Autodesk Revit Family format, used by architects, engineers, contractors, and building-product manufacturers. It stores reusable components such as doors, windows, furniture, lighting fixtures, structural parts, and equipment.

Unlike a general mesh file, an RFA can contain family types, dimensional and formula-driven parameters, nested families, materials, connectors, visibility controls, reference planes, host requirements, and category data. Revit evaluates these definitions when a family is loaded and placed in an .rvt project.

Autodesk Revit can open an RFA in the Family Editor, but Revit has no native OBJ export command. The old built-in FBX export workflow is also not a current general solution: Autodesk removed FBX export from Revit 2023 and later.

What OBJ provides

OBJ is an open, text-based polygon-mesh format supported by Blender, 3ds Max, Maya, Cinema 4D, many renderers, and numerous game, web, and fabrication tools. It can store vertices, faces, normals, UV coordinates, object names, and group assignments.

Materials are normally written to a separate .mtl file, which can reference texture images. Transfer the .obj, .mtl, and every referenced image in the same folder structure.

OBJ does not preserve Revit types, formulas, categories, schedules, parameters, constraints, hosting rules, connectors, annotations, or editable BIM relationships. It is suitable only for exported visible geometry and basic material assignments.

Convert with Revit and an OBJ exporter

The most dependable route is a Revit plug-in that explicitly supports the installed Revit release. SimLab OBJ Exporter for Revit and ProtoTech OBJ Exporter for Revit are established commercial options; confirm support for the required Revit version, family geometry, material export, and active-view or selection export before purchasing.

1. Open the .rfa in Revit Family Editor. Select the required type in Create → Properties → Family Types if the file contains multiple types.
2. Create or open a 3D view and set its detail level, visibility/graphics overrides, and section box so only required geometry is visible. Hide reference geometry and unwanted nested content where possible.
3. For a hosted family or a family whose appearance depends on project context, create a Revit project, load the family through Insert → Load Family, place the required type on its wall, face, ceiling, floor, or work plane, then prepare an isolated 3D view.
4. Run the installed exporter from its Revit ribbon command. Choose the active 3D view or selected elements, not the whole project, unless project context is required.
5. Set the available mesh-quality or tessellation option high enough for curved edges, select material and texture export if needed, and set the output unit if the exporter provides one.
6. Open the OBJ in Blender or MeshLab and check dimensions, orientation, missing nested components, normals, UVs, and material links before distributing it.

Many exporters can work from a project view rather than directly from Family Editor. If that is the case, placing the family in a minimal project is required; it also gives hosted and nested elements the most predictable result.

Desktop and online alternatives

CAD Exchanger Lab can import supported Revit family files and export OBJ, and CAD Exchanger Cloud provides a browser-based option when its current conversion matrix lists the specific RFA input and OBJ output required. Test a non-confidential family first: RFA support and material results can vary with Revit release and family features.

Online conversion is unsuitable for confidential manufacturer content, project-specific components, or families containing proprietary geometry unless the provider’s storage, retention, and deletion terms are acceptable. Avoid sites that merely accept an .rfa extension without documenting Revit-family support.

If an older Revit installation still has FBX export, exporting a prepared project 3D view to FBX, importing it into Blender, and using File → Export → Wavefront (.obj) can work. This is a legacy fallback, not a workflow available in current Revit versions.

Quality and compatibility limits

Revit solids and curves are tessellated into triangles or polygons during export. Higher tessellation produces smoother arcs and fillets but increases OBJ size; inspect curved profiles at the destination rendering distance before increasing quality indiscriminately.

OBJ has no mandatory unit declaration. Revit stores internal lengths in feet, while OBJ stores bare coordinate values, so applications may import the model at an unexpected size. Measure a known dimension in Blender or the receiving application and correct scale once before final export.

Revit appearance assets, procedural materials, decals, cut patterns, transparency, and physically based material settings rarely map exactly to OBJ/MTL. OBJ/MTL has no standardized PBR material model, so textures may need relinking and roughness, normal, opacity, or metallic settings may need recreation in the destination software.

Dimensions, symbolic lines, reference planes, void behavior, connectors, analytical data, and annotations do not become useful OBJ geometry. Nested families export only if their geometry is resolved and visible in the exported family or project view.