Navigate to in SAC and save the project. This generates a unified .pkt file. Open your target drawing in AutoCAD Civil 3D. Open the Tool Palettes command ( CTRL + 3 ).
Contains the building blocks of your subassembly, categorized into: Points, Links, and Shapes. Advanced: Daylight, Intersection, and Curve tools.
Updated tutorials for the 2026 version.
Links are the linear segments connecting two points (e.g., L1 connects P1 to P2 ). Links are vital because they form the datum and top surfaces used for corridor triangulation and earthwork quantity takeoff calculations. Shapes (S)
Instead of being limited to the parameters provided by Autodesk, you define your own: Subassembly Composer Autocad Civil 3d Tutorial Pdf
For many civil engineers and designers, SAC feels like a daunting step into programming. However, with the right guidance, it becomes the most powerful tool in your Civil 3D arsenal. In this post, we provide an overview of the workflow and—most importantly—resources to help you find the best to add to your library.
| Mistake | Symptom | PDF Solution | | :--- | :--- | :--- | | | Corridor says "Target not found" | Check section on 'Mapping Targets in Corridor Properties' | | Using inches vs. feet | Curb is 1000x too big | Use Units parameter or convert all math to consistent units | | Not using AP1 (Attachment Point) | Subassembly floats in space | Always reference P1 relative to AP1 (the insertion point on the assembly) | | Invalid Visual Basic expression | SAC shows red error on export | Use the 'Expression Tester' built into SAC – tutorial shows syntax for IIF vs IF | | Shapes not showing codes | Can't create material quantities | Assign 'Code' to Shape (e.g., Pave or Base ) – PDF includes code naming conventions | Navigate to in SAC and save the project
A comprehensive manual covering advanced techniques and Florida DOT standards.