Methodologies and Advice

This section provides information regarding supported features and limitations when using IGES data in CATIA V5, which users should be familiar with prior to configuring and using IGES Plug-in.

Output Formats

When importing Multi-CAD data within CATIA V5, a conversion is performed. Depending on the use of data you are going to have, you can choose whether to create a cgr, CATPart.

With all these formats you can access to part user attributes using Edit -> Properties:

  • Move the data (cf. limitations to move due to the associative mode)
  • Clash detection
  • Inertia and Volume calculations

Each format has its own limitations and advantages:

  • cgr (CATIA Graphical Representation) is the visualization format of CATIA V5. With this very light format, you can do approximate measurement and have access to all the basic DMU functionalities.
  • CATPart (CATPart mode). It is a standard V5 CATPart which is locked, therefore you can use it as any other CATPart with the exception that you cannot modify it. You can just reference it.

Supported Features

  • Access to part user attributes (via Edit->Properties)
  • Move
  • Exact positioning - Snap command - when using CATPart Mode
  • Clash detection
  • Approximate measurements (or exact measurement with a CATPart)
  • Inertia and volume calculations


  • Approximate snap is not working in some cases.
  • Support for filtering of blanked objects is not available, therefore all blanked objects will be converted.

IGES entities that are not converted


  • Wireframes : composites curves (type 102) , polilynes (type 106 form 11, 12,13, 63), bspline curve (type 126), circles and circular arcs (type 100), conic arcs (type 104), lines (type 110) , parametric spline curve (type 112), offset curves (type 130), and all independent curves.
  • Copious Data Entity - Type 106 form 1,2 ,3,
  • Associativity Instance Entities - Type 402,
  • Layers.



Using CATPart  Mode versus Visu Mode

The MULTICAx IGES Plug-in supports CATPart mode, allowing for IGES parts to be imported as CATPart data files. In this mode, IGES parts data contained in the solid body are transferred into a CATPart.

As CATPart files are large and take more time to convert, the CATPart mode management is an optional feature. 

CATPart Features and Limitations

The features and limitations of Multi-CAD CATParts are the same as the ones of locked V5 CATParts, which can be used as a reference but cannot be modified.

When to use the CATPart Mode

CATPart Mode is used when a user needs to perform exact positioning and exact measuring.

You should be aware that the conversion to the CATPart format requires more time than only generating the CGR (faceted format). In addition, CATPart files are larger than their corresponding CGR files. Therefore, it is recommended that CATPart mode is only enabled if exact positioning, exact measurement or putting constraints is required.