Convert PRT to CGR

Understanding PRT and CGR file formats

PRT files are 3D part files primarily associated with CAD software such as Siemens NX and PTC Creo. They contain detailed parametric models, including geometry, features, and design history. CGR files, on the other hand, are CATIA Graphical Representation files used by Dassault Systèmes CATIA. CGR files store lightweight, tessellated representations of 3D models, optimized for visualization and sharing without exposing full design data.

Why convert PRT to CGR?

Converting a PRT file to CGR is common when you need to share 3D models for visualization or collaboration, especially in environments using CATIA. CGR files are much smaller and protect intellectual property by not including editable design data.

How to convert PRT to CGR

Direct conversion from PRT to CGR is not natively supported in most CAD software. The typical workflow involves first exporting the PRT file to a neutral format such as STEP (.stp) or IGES (.igs), then importing it into CATIA and exporting as CGR.

Step-by-step conversion process

1. Open your PRT file in its native CAD software (e.g., Siemens NX or PTC Creo).
2. Export the model to a neutral format:
   • In Siemens NX: File → Export → STEP or File → Export → IGES
   • In PTC Creo: File → Save As → Save a Copy → Type: STEP or IGES
3. Open CATIA and import the exported STEP or IGES file: File → Open.
4. Once the model is loaded, select the part and use Tools → Generate CATIA Graphical Representation or File → Save As and choose CGR as the file type.

Best software for PRT to CGR conversion

The most reliable method is using CATIA by Dassault Systèmes, as it natively supports CGR export. For batch conversions or automation, consider 3D Evolution or CAD Exchanger, which support a wide range of CAD formats and can streamline the process.

Key considerations

• Data loss: Converting to CGR results in a tessellated, non-editable model. Design features and parametric data are not preserved.
• Licensing: Both CATIA and most third-party converters require valid licenses for full functionality.
• Batch conversion: For large numbers of files, look for software with batch processing capabilities.