Formatguide
OpenCASCADE native exact-geometry format — precise NURBS topology for FreeCAD and OCC-based tools.
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| Extension | .brep, .brp |
|---|---|
| Full name | Boundary Representation (OpenCASCADE native) |
| Geometry type | Exact solid geometry — NURBS, B-spline, topology |
| Open standard | Yes — OpenCASCADE Technology (OCCT) |
| Supports color | No |
| Supports assemblies | Yes — compound shapes |
| Primary tool | FreeCAD, any OCCT-based application |
BREP (.brep/.brp) is OpenCASCADE Technology (OCCT) native format for exact boundary-representation solid geometry. It stores OCCT internal geometric representation (NURBS surfaces, B-spline curves, exact topology). Used in the open-source CAD ecosystem — FreeCAD and any tool built on the OpenCASCADE kernel.
FreeCAD uses BREP as an intermediate format for its Part workbench. Exporting to BREP preserves exact geometry for reimport into other OCCT tools.
Developers building on OpenCASCADE use .brep files to serialize and deserialize solid geometry in CAD pipelines.
BREP files are used in FEA preprocessing (Salome, GMSH mesh generation) and computational geometry research.
FreeCAD, Salome, GMSH and any application built on OpenCASCADE Technology (OCCT). 3D CAD Converter reads and writes BREP using OCCT.
Commonly converted to STEP for universal CAD exchange, to STL or 3MF for 3D printing, or to OBJ/glTF for visualization.