A well-structured on Subassembly Composer typically includes:
Used to widen links along feature lines, polylines, or alignments. Elevation Targets: Used to match vertical profiles. Using the Decision Tool
Add standard codes like "Top" , "Datum" , or "Pave" to links and points to ensure correct surface generation and labeling in corridors.
In this tutorial, we have covered the basics of Subassembly Composer in AutoCAD Civil 3D and provided a step-by-step guide on how to create a custom subassembly. By mastering Subassembly Composer, users can create custom subassemblies that meet their specific design needs, improving productivity and accuracy in corridor design. Subassembly Composer Autocad Civil 3d Tutorial Pdf
Typically installed alongside AutoCAD Civil 3D , the Subassembly Composer provides a flowchart-based interface for defining the logic and geometry of a subassembly. Instead of being limited to the "out-of-the-box" library, you can define your own points, links, and shapes that respond dynamically to targets and parameters within your model. Key Components of a Subassembly
This is where you assemble your subassembly's geometry using the visual flowchart.
Reduce manual drafting by creating smart components that automatically adapt to daylighting conditions. 2. Understanding the SAC Interface In this tutorial, we have covered the basics
Projects a line at a specific slope until it strikes an external target surface.
Drag a new Point into the side to define your Cut geometry.
Point or Link codes are missing quotation marks inside SAC properties. Instead of being limited to the "out-of-the-box" library,
Use the API Surface.GetElevationAtXY function. This allows your subassembly to read the existing ground and automatically adjust depth. Example: DeltaY = Surface.GetElevationAtXY(P1.X, P1.Y) - P1.Y .
Below is a comprehensive guide structured like a technical paper/tutorial. This covers the core concepts, workflow, and logic required to master Subassembly Composer for AutoCAD Civil 3D.
New points are usually defined relative to an existing point (e.g., P2 is offset from P1 ).
Many universities and Autodesk Student communities publish PDF walkthroughs. These often contain a sample project (like a "Daylight Basin" or "Curb and Gutter").