BREP → 3DM

Convert BREP to 3DM

Turn a BREP CAD model into a 3DM mesh. Curved surfaces are meshed finely enough to stay smooth, and the part keeps its real size and orientation.

  • Fine, accurate meshing of curved surfaces
  • Real size and right way up
  • Runs on your computer: nothing is uploaded
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Drop a BREP file or
Files stay on your computer.
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How to convert BREP to 3DM

  1. Add your BREP file

    Drop it on the converter above or click browse. It opens in your browser, so nothing is uploaded.

  2. Check the format is 3DM

    3DM is already selected. You can switch to any other output from the menu.

  3. Convert and download

    Click Convert and your 3DM file is ready in seconds. Download it straight away.

What is BREP?

BREP is the native exact-geometry format of the OpenCascade kernel, used by FreeCAD, CadQuery and many engineering tools built on it.

Full name
OpenCascade boundary representation
Type
Exact CAD geometry
Used in
FreeCAD, CadQuery, Salome, OpenCascade-based tools
Strength
Lossless for OpenCascade-based software.
Limits
Rarely supported outside the OpenCascade family.
More about BREP

What is 3DM?

3DM is the native file of Rhino, used widely in industrial, jewellery and architectural design. It stores NURBS surfaces, SubD objects, meshes and block instances.

Full name
Rhinoceros 3D model (openNURBS)
Type
Exact CAD geometry
Used in
Rhino, Grasshopper, KeyShot, Blender (with add-on)
Strength
Rich surface modelling data from Rhino.
Limits
Surfaces are converted using the render meshes Rhino saves in the file.
More about 3DM

Good to know

BREP stores exact surfaces; 3DM needs triangles. We mesh each surface with a deviation of 0.05% of the part's size, which keeps holes and fillets smooth for printing and rendering.

Dimensions stay in the units of the original file, usually millimetres.

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Questions

Will curves look faceted?

No. Curved faces are meshed with a tight tolerance, so holes and fillets stay smooth.

Does it keep the size of my part?

Yes. The mesh has the same dimensions as the CAD model.

Are my files uploaded?

No. Everything runs in your browser.