Every custom subassembly relies on three primary components, known as : Points, Links, and Shapes.
Instead of coding in C# or VB.NET, the SAC uses a visual, node-based flowchart interface to define: Points, Links, and Shapes.
Use them to find intersection points or geometry positions before placing actual structural points.
Repeat the point process downward to define the pavement depth (e.g., P3 and P4 ). Once you have a fully closed loop of links ( L1 , L2 , L3 , L4 ): Drag a tool into your flowchart.
This comprehensive guide serves as your definitive roadmap to mastering Subassembly Composer. You will learn how to build dynamic, parametric, and intelligent subassemblies to optimize your transportation, site development, and grading workflows. 1. Introduction to Subassembly Composer civil design 3d subassembly composer tutorial pdf top
Before diving into the "how," it's crucial to understand the "why." The power of the Subassembly Composer lies in its ability to move beyond static, hard-coded sections. It enables true for your corridors.
Drag a tool from the Toolbox into the Flowchart, snapping it directly underneath P1. Select the new point ( P2 ).
To accelerate your learning, studying real-world examples is invaluable. Sample PKT files are available for download from the and are often included with your Civil 3D installation. You can find installed sample subassemblies in a folder path similar to: C:\ProgramData\Autodesk\C3D 20xx\enu\Subassemblies\Metric . Opening these complex files in SAC is a great way to see how advanced features like loops, switches, and API functions are structured.
Here’s a curated list of the , focusing on high-quality, practical guides. Every custom subassembly relies on three primary components,
Build tailored components for unique design scenarios like specialized curb types, complex lane widening, or non-standard utility trenches.
Where you define variables that can be modified in Civil 3D. 2. Defining Input Parameters
This comprehensive tutorial covers everything you need to know to master Subassembly Composer, structure your workflows, and build advanced corridors. 1. Understanding the Subassembly Composer Interface
[P3]-------[P4] (Curb Top) | | | | Origin [P1]============[P2] [P5] (Gutter) \ / \ LANE SHAPE / \ / [P6]==========[P7] Step 1: Set Up Input Parameters Repeat the point process downward to define the
In the Expression field, write an IF/THEN statement. For target checking, use: BaseSurface.IsValid .
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Always design your subassembly for either the Left or Right side using the standard Side parameter. Civil 3D will handle the mirroring automatically when you use the "Mirror Subassembly" tool in your drawing workspace.