• Help Home
  • English (US)
    1. English (US)
    2. 简体中文
    3. 繁體中文
    4. Čeština
    5. Deutsch
    6. English (UK)
    7. Español
    8. Français
    9. Magyar
    10. Italiano
    11. 日本語
    12. 한국어
    13. Polski
    14. Português (Brasil)
    15. Русский
Autodesk Civil 3D 2026
    • What's New in Civil 3D
      • What's New in Civil 3D 2026
    • Release Notes
    • Help
    • Drainage Design and Analysis Tools
    • Tutorials
    • Best Practices Guide
    • Have You Tried
    • Subassembly Reference
    • Subassembly Composer Help
    • Project Explorer Help
    • IFC 4.3 Extension for Autodesk Civil 3D
    • Dynamo for Civil 3D
    • Survey and Transform Tools for Coordinate Geometry (in English only)
    • Infrastructure Content Authoring
    • Content Browser Help
    • Object Enabler Help
    • CAiCE Translator Help
    • API Reference Guide
    • Developer's Guide
    • Learn AutoCAD Map 3D
    • Use AutoCAD Map 3D
    • Customize AutoCAD Map 3D
    • AutoCAD User's Guide
    • Customization and Administration Guides
    • AutoLISP: Developer's Guide
    • AutoLISP: Reference
    • Autodesk Civil 3D Installation
    Share
    • Email
    • Facebook
    • Twitter
    • LinkedIn
     
     

    SURFACEAUTOTRIM (System Variable)

    Controls whether surfaces are automatically trimmed when you project geometry onto them.

    Type:Integer
    Saved in:Registry
    Initial value:0
    Find

    Value

    Description

    0

    Surfaces are not trimmed when you project geometry onto them

    1

    Surfaces are automatically trimmed to geometry that is projected using PROJECTGEOMETRY

    Related Concepts

    • About Trimming Surfaces

    Related Reference

    • Commands for Creating Procedural Surfaces
    • Commands for Surface Editing

    Was this information helpful?

    Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Please see the Autodesk Creative Commons FAQ for more information.

    • Privacy Statement
    • Legal Notices & Trademarks
    • Report Noncompliance
    • © 2025 Autodesk Inc. All rights reserved