Rename your flowchart blocks from generic terms like "Sequence1" to descriptive names like "Curb_Logic_Sequence".
Civil 3D will fail to parse point, link, or shape codes unless they are wrapped in straight quotes (e.g., "Top_Lane" ).
If (Fill): Divert the flowchart to build an embankment slope.
If you'd like to get started with a specific project, let me know if you need help with: (like decision tables) Targeting surfaces for daylighting Assigning codes for quantity takeoff I can help tailor the next steps to your specific needs. Share public link
Assigning codes (e.g., "Top", "Flange", "ETW") allows Civil 3D to generate feature lines and breaklines along the corridor. 2. Links (L) civil 3d subassembly composer tutorial pdf
: Building the geometry and logic flowchart within the Subassembly Composer interface .
: Straight lines connecting two points. Links form the structural faces of your subassembly and carry coding for top, datum, or subbase surfaces.
Autodesk provides robust documentation and getting-started guides accessible via their Knowledge Network.
Reduce the need for manual edits in Civil 3D by building logic directly into the corridor template. 2. Understanding the SAC Interface Rename your flowchart blocks from generic terms like
Which option do you want?
This is arguably the most comprehensive, tutorial-style PDF available. Created by the Florida Department of Transportation (FDOT), this document is a complete course designed to be used in an academic or self-paced training environment.
: Set up horizontal and vertical targets (e.g., "Alignment" or "Surface") so the subassembly can dynamiclly stretch to meet project site conditions. 3. Build the Geometry Use the Toolbox to drag elements into the Flowchart window. AutoCAD Civil 3D and Subassembly Composer - Autodesk
The learning curve for Subassembly Composer is not steep, but it is distinct. Here is a recommended progression: If you'd like to get started with a
Once your subassembly functions perfectly in the preview window: Go to and save it as a Packet File ( .pkt ). Open Autodesk Civil 3D. Open your Tool Palettes ( CTRL+3 ).
Every custom subassembly relies on three foundational elements. They must be constructed in a specific chronological order:
, as well as advanced geometry and workflow logic (e.g., Decisions).
Contains the building blocks (Points, Lines, Shapes, Decisions, and Switches) that you drag and drop into your design.
