How to Convert IFC to OBJ for Blender, Unity, and Unreal

Turn a BIM model into a plain OBJ mesh that imports cleanly into Blender, Unity, Unreal Engine, or any 3D software.

IFC is great for BIM workflows but most 3D software — Blender, Unity, Unreal Engine, and other 3D tools — does not read it natively. OBJ, on the other hand, is understood by almost every 3D tool ever made. Converting IFC to OBJ bridges the two worlds.

Why OBJ?

  • Universal compatibility. Every 3D application from the last thirty years can import OBJ.
  • Plain text format. Easy to inspect, easy to debug, easy to post-process with scripts.
  • Ships with a material file (.mtl). Basic colours and textures come across automatically.
  • No licence restrictions. OBJ is an open format originally created by Wavefront Technologies.

Step-by-step: convert IFC to OBJ

  1. Upload your IFC file to BIMCamel.
  2. (Optional) Run Keep Physical Elements Only first. This strips annotations, grids, axes, and other non-geometric entities that usually clutter a game-engine import.
  3. (Optional) Run Optimize Model on "Medium" to reduce polygon count before export. A cleaner OBJ imports faster and renders better on lower-end hardware.
  4. Open the IFC to OBJ tool.
  5. Click Run. BIMCamel tessellates the IFC geometry and produces a .obj file plus an accompanying .mtl material file packaged together.
  6. Download the result and import into your target software.

Importing into Blender

File → Import → Wavefront (.obj). Blender's built-in importer handles both the mesh and the material file automatically. If the model looks tiny or gigantic, check that the import scale is set to match the unit system of your project.

Importing into Unity

Drop the .obj file into your Assets folder. Unity imports it as a prefab with child meshes for each element group. You will usually want to re-assign materials using Unity's own shader graph or URP/HDRP materials, since .mtl only carries basic colour information.

Importing into Unreal Engine

Unreal 5 supports OBJ import directly via the Content Browser. For better results on big architectural models, enable Nanite on the imported static mesh so Unreal can handle the polygon count without manual LOD work.

Tips for the cleanest OBJ export

  • Reduce before you convert. A 500 MB IFC file produces an absolutely massive OBJ. Use Simplify to Boxes on non-essential elements, remove materials if you do not need them, and strip annotations.
  • Match coordinate systems. IFC often stores absolute world coordinates (real latitude/longitude). Unity and Unreal prefer small local coordinates. If your model shows up thousands of metres from the origin, run Fix IFC Coordinates on the IFC file before exporting.
  • Watch the polygon count. Game engines are happiest under a million triangles per object. Split huge meshes using Split IFC Model before conversion if you need to keep each element selectable.

What OBJ does not preserve

OBJ is a pure geometry format. It does not carry IFC property data, classifications, quantities, or relationships. If you need those in your 3D tool, export them separately with Export to Excel and re-attach them in-software with a small script.

Alternatives

  • glTF (use Export to 3D (glTF)) is a more modern format with better material support and built-in compression. Prefer glTF for web viewers and AR/VR.
  • STEP (use IFC to STEP) is better for engineering and CAD/CAM workflows where you need NURBS precision rather than a triangle mesh.

If all you need is to get a building model into a 3D tool that can render, light, and animate it — OBJ is almost always the right answer, and BIMCamel gets you there in two clicks.

Tools mentioned in this guide

Part of BIMCamel's Learn library — browse the free online tools or see every guide.