Subassembly Composer Autocad Civil 3d Tutorial Pdf May 2026

Autodesk Subassembly Composer (SAC) is a visual, standalone application for creating custom Civil 3D corridor components by building logic-based geometry through points, links, and shapes rather than manual coding. The workflow involves defining input parameters for flexibility, creating geometry in a flowchart, validating with the preview panel, and saving as .pkt files for import. For detailed, step-by-step tutorials, see the Autodesk guide Subassembly Composer Pt. 1 - Exploring the Interface 12 Feb 2016 —

The Autodesk Subassembly Composer (SAC) for AutoCAD Civil 3D allows you to create custom roadway or grading cross-sections without the need for complex programming. It is typically included with your Civil 3D installation and can be launched from the Windows Start menu under the Autodesk folder. 1. Getting Started with the Interface

The SAC interface is divided into five primary panels that you can rearrange or dock as needed: Subassembly Composer Autocad Civil 3d Tutorial Pdf

Toolbox: Contains the building blocks for your subassembly, including basic geometry (Points, Links, Shapes), advanced geometry, and workflow logic like "Decisions".

Flowchart: The main workspace where you drag and drop components from the toolbox to build your design structure. Autodesk Subassembly Composer (SAC) is a visual, standalone

Preview: Displays a visual representation of your subassembly in real-time as you build it.

Properties: Used to adjust specific parameters (e.g., coordinates, link codes) for any selected object in the flowchart. Step 4: Add Logic (The Power Move) This is why we use SAC

Packet Settings (Input/Output Parameters): Where you define the subassembly's name and create user-adjustable variables like width, depth, or slope. 2. Core Workflow Steps A typical project follows these six steps: Subassembly Composer Pt. 1 - Exploring the Interface

Step 4: Add Logic (The Power Move)

This is why we use SAC. You can add a Decision node.

  • Example: "If the surface target is higher than the road, build a fill slope. If it is lower, build a retaining wall."

4. Professional Training Providers

  • IMAGINiT Technologies – Offers sample PDF chapters.
  • Symetri – Sometimes releases free PDF tip sheets.
  • CADLearning by Rand Worldwide – Their course companion files are often in PDF.

Step 6: Preview and Validate

  1. Click Preview (eye icon).
  2. Test your parameters: Change BottomWidth from 1.5 to 3.0. The shape should widen.
  3. Test the IncludeCheckDam checkbox. The rectangle should appear/disappear.