Convert 3DXML to CGR in your application
3D InterOp is a CAD interoperability SDK that lets your software read 3DXML files and write CGR, carrying the mesh data across without re-tessellating it.
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 3D XML · Writes CGR
- Triangle mesh → triangle mesh
- C++ / C# APIs
3DXML to CGR at a glance
Both formats store triangles, so the facets carry over without re-tessellation. The differences are in structure, appearance and metadata.
| 3D XML (source) | CGR (target) | |
|---|---|---|
| Full name | 3D XML | CATIA Graphical Representation |
| Standard / owner | Dassault Systèmes | Dassault Systèmes |
| File extensions | .3dxml | .cgr |
| Geometry | Tessellated geometry | Tessellated geometry |
| Assemblies / structure | Yes | Single part |
| PMI | Graphical PMI | None |
| 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 3D XML to CGR.
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Preserved
Mesh dataThe 3DXML facets are read and written to CGR without being re-tessellated.
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Changes
Assembly structureCGR has no native assembly hierarchy. Decide in your application how 3D XML product structure is grouped or flattened before writing.
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Not carried
PMICGR has no place for PMI, so the PMI read from 3DXML isn’t written.
Why software vendors add 3DXML to CGR conversion
Lightweight review
CGR carries tessellated geometry that opens much faster than the full CAD model, so design reviews and digital mockups stay responsive.
Sharing outside engineering
Marketing, training and sales teams rarely have CAD software. A CGR file gives them the shape in a format their tools can open.
Easier handling of large assemblies
Without exact surfaces and feature data, CGR files are easier to transfer and display, even for large assemblies.
Things to check before you ship
- Written CGR versions: CATIA V5 R15 to V5-6 R2026, with the CATIA V5 writer.
- Supported 3DXML input: 3D XML 4.0 to 4.3 (tessellated data only).
- B-Rep stored in authoring-mode 3D XML files isn’t imported: only the tessellation is read.
- Test tessellation settings on your heaviest parts: finer meshes mean larger files.
- 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 3D XML (.3dxml) file?
3D XML is Dassault Systèmes’ lightweight XML-based format for sharing 3D product data. 3D InterOp reads and writes its tessellated representation, with product structure and graphical PMI.
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Target 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.
Frequently asked questions
No re-tessellation is needed. 3D InterOp reads the 3DXML facets as visualization data and writes them to CGR.
CGR has no place for PMI, so the PMI read from 3DXML isn’t written. Your application can still access it after import, or offer STEP AP242 as an output.
CGR has no assembly hierarchy, so your application decides how the 3DXML structure is grouped or flattened before writing.
No. B-Rep stored in authoring-mode 3D XML files isn’t imported: 3D InterOp reads the tessellation only.
3D InterOp reads 3D XML 4.0 to 4.3 (tessellated data only), as visualization data.
3D InterOp writes CGR files with its CATIA V5 writer, for CATIA V5 R15 to V5-6 R2026.
Yes. 3D InterOp reads and writes both formats, so CGR to 3DXML is supported too.
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Building software that needs to convert 3DXML to CGR?
3D InterOp is an SDK that lets your application read 3D XML and write CGR alongside 30+ CAD and BIM formats.