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AutoCAD 2026 for Mac Developer and ObjectARX
    • Customization Guide
    • DXF Reference
      • DXF Format
      • Header Section
      • Classes Section
      • Tables Section
      • Blocks Section
      • Entities Section
        • About the DXF ENTITIES Section
        • Common Group Codes for Entities (DXF)
        • 3DFACE (DXF)
        • 3DSOLID (DXF)
        • ACAD_PROXY_ENTITY (DXF)
        • ARC (DXF)
        • ATTDEF (DXF)
        • ATTRIB (DXF)
        • BODY (DXF)
        • CIRCLE (DXF)
        • COORDINATION MODEL (DXF)
        • DIMENSION (DXF)
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        • HELIX (DXF)
        • IMAGE (DXF)
        • INSERT (DXF)
        • LEADER (DXF)
        • LIGHT (DXF)
        • LINE (DXF)
        • LWPOLYLINE (DXF)
        • MESH (DXF)
        • MLEADER (DXF)
        • MLEADERSTYLE (DXF)
        • MLINE (DXF)
        • MTEXT (DXF)
        • OLEFRAME (DXF)
        • OLE2FRAME (DXF)
        • POINT (DXF)
        • POLYLINE (DXF)
        • RAY (DXF)
        • REGION (DXF)
        • SECTION (DXF)
        • SEQEND (DXF)
        • SHAPE (DXF)
        • SOLID (DXF)
        • SPLINE (DXF)
        • SUN (DXF)
        • SURFACE (DXF)
        • TABLE (DXF)
        • TEXT (DXF)
        • TOLERANCE (DXF)
        • TRACE (DXF)
        • UNDERLAY (DXF)
        • VERTEX (DXF)
        • VIEWPORT (DXF)
        • WIPEOUT (DXF)
        • XLINE (DXF)
      • Objects Section
      • THUMBNAILIMAGE Section
      • Drawing Interchange File Formats
      • Advanced DXF Issues
    • AutoLISP and DCL
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    REGION (DXF)

    The following group codes apply to region entities.

    Region group codes

    Group code

    Description

    100

    Subclass marker (AcDbModelerGeometry)

    70

    Modeler format version number (currently = 1)

    1

    Proprietary data (multiple lines < 255 characters each)

    3

    Additional lines of proprietary data (if previous group 1 string is greater than 255 characters) (optional)

    Related Concepts

    • About DXF Formatting Conventions

    Related Reference

    • Common Group Codes for Entities (DXF)
    • About the DXF ENTITIES Section

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