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HOME/USEFUL GUIDES/GUIDE TO 3D FILE FORMATS/IGS FILE FORMAT EXPLAINED
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IGS File Format Explained

The Initial Graphics Exchange Specification (IGES) is a vendor-neutral file format used to exchange digital information between CAD systems. Established in 1980, IGES is a legacy CAD exchange standard used mainly for transferring 2D geometry, curves, and 3D surface models across engineering systems.

IconExtensionOriginal SoftwareYearPrimary IndustryGeometryUV MapsTexturesPBRAnimationRiggingOpen Use
IGS Icon.IGSInitial Graphics Exchange1980CAD
Engineering		NURBS
B-Rep		–––––✔

IGS File Format Details

What It Stores

IGES files primarily store geometric data such as wireframes, curves, surfaces, and some solid representations. It focuses on precise geometric shapes rather than textures, rigging, or animation data.

Primary Use Cases

  • Exchanging complex CAD data between different engineering software.
  • Exchanging 2D technical drawings and schematics between CAD systems.
  • Providing surface geometry that can be used in CAM and some manufacturing workflows.

Strengths

  • Widely supported by many professional CAD and CAM applications.
  • Good for representing smooth curved surfaces using mathematical geometry such as NURBS.
  • ASCII-based structure allows for manual inspection of geometric data.

Limitations

  • Files can become extremely large compared to modern formats like STEP.
  • Translation between systems may result in gaps or broken surfaces.

Common Software Support

Supported by many CAD systems, including Rhino, SolidWorks, CATIA, and some Autodesk products, depending on version and workflow.

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