Convert CGR to CATProduct in your application
3D InterOp is a CAD interoperability SDK that lets your software read CGR files and write CATProduct, writing the CGR facets as faceted geometry, since CGR stores triangles rather than solids.
Spatial does not offer an online converter or a desktop conversion app. 3D InterOp is a component that software vendors embed in their own products.
- Reads CGR · Writes CATProduct
- Triangle mesh → faceted B-Rep
- C++ / C# APIs
CGR to CATProduct at a glance
CGR stores triangles; CATProduct is an exact-geometry format. The mesh is written as faceted geometry: 3D InterOp doesn’t rebuild smooth surfaces from triangles.
| CGR (source) | CATProduct (target) | |
|---|---|---|
| Full name | CATIA Graphical Representation | CATIA V5 Product (assembly) |
| Standard / owner | Dassault Systèmes | Dassault Systèmes |
| File extensions | .cgr | .CATProduct |
| Geometry | Tessellated geometry | Exact B-Rep (in the referenced parts) |
| Assemblies / structure | Single part | Yes |
| PMI | None | Semantic and graphical |
| 3D InterOp support | Read and write | Read and write |
What's preserved, what changes
Here is what your application can expect to carry across from CGR to CATProduct.
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Changes
Faceted geometryCGR stores triangles, so the CATProduct file holds faceted bodies, not solids. 3D InterOp doesn’t rebuild exact B-Rep from a mesh.
Why software vendors add CGR to CATProduct conversion
Deliver in your customer’s CAD format
Aerospace and automotive OEMs often require supplier data in CATProduct. Writing it lets your users meet that requirement directly from your application.
Exact geometry, ready to edit
CATProduct keeps exact B-Rep geometry, so the receiving engineer can measure, modify or machine the model in CATIA.
No neutral-format round trip
Writing CATProduct directly avoids an extra STEP or IGES step, and the loss each extra translation can add.
Things to check before you ship
- Written CATProduct versions: CATIA V5 R15 to V5-6 R2026.
- A CATProduct written by 3D InterOp can’t reference files in other formats.
- Supported CGR input: CATIA V5 R8 to V5-6 R2026.
- Validate a sample of translated files in the target system your users actually work with.
Working with Spatial was a real milestone for us: Thanks to the powerful 3DInterOp library, we were able to successfully bring our complex CAD-based solutions to the cloud while remaining flexible to meet individual customer requirements. For us, Spatial is not just a technology partner, but a true enabler of our product strategy.
Dr. Arno Michelis, Founder, Simus Systems
Read the Case StudyAbout the formats
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Source format
What is a CGR (.cgr) file?
CGR is CATIA’s lightweight graphical representation format. It stores a tessellated version of a part for fast display in large assemblies.
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Target format
What is a CATProduct (.CATProduct) file?
A CATProduct file is a CATIA V5 assembly. It defines the product structure and positions, and references the CATPart files that hold the geometry.
Frequently asked questions
No. CGR stores triangles, and 3D InterOp writes them to CATProduct as faceted geometry. It doesn’t rebuild exact B-Rep from a mesh.
No. A CATProduct written by 3D InterOp can’t reference files in other formats.
No. 3D InterOp reads CGR files directly, without CATIA or a CATIA license on the machine.
3D InterOp reads CATIA V5 R8 to V5-6 R2026, as visualization data.
3D InterOp writes CATIA V5 R15 to V5-6 R2026.
Yes. 3D InterOp reads and writes both formats, so CATProduct to CGR is supported too.
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Building software that needs to convert CGR to CATProduct?
3D InterOp is an SDK that lets your application read CGR and write CATProduct alongside 30+ CAD and BIM formats.