This tutorial guides you through creating a dynamic subassembly for a roadside ditch.
Name your parameter (e.g., LaneWidth ) and set the type to . Set the default value (e.g., 3. Building the Geometry (Points, Links, Shapes)
Simulates how the subassembly will appear in the Civil 3D Assembly tool palette. Toolbox Panel
Set Type to Delta X . Set $\Delta X = -CurbWidth$ relative to P4. Step 3: Create Links
Drag a block to the "True" branch for your cut logic, and another to the "False" branch for your fill logic. Inside your daylight sequence, drag a new point ( P3 ). Set its Creation Type to Slope to Surface . Subassembly Composer Autocad Civil 3d Tutorial Pdf
The Autodesk Subassembly Composer is a standalone application installed alongside Civil 3D. It provides a visual environment where designers can define geometry using points, links, and shapes, constrained by parameters, targets, and logic.
To make a subassembly dynamic, you must use parameters instead of hardcoded values. Input/Output Parameters
Non-geometry lines used for layout and calculations. 4. Step-by-Step Tutorial: Creating a Simple Custom Curb
Displays a real-time visual representation of the geometry as it is built. This tutorial guides you through creating a dynamic
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Establishes external targets like surfaces, horizontal alignments, or profiles.
Autodesk Civil 3D is the industry standard for civil engineering design. However, the software's default subassemblies do not always meet the requirements of complex, real-world corridor modeling. When standard lane, curb, or ditch components fall short, the provides the ultimate solution.
Click the newly created icon on your tool palette, then click on your design baseline assembly in the drawing area to deploy it. Troubleshooting Common Errors Error Symptom Common Root Cause Recommended Fix Code fields entered without string characters. Wrap text strings in straight quotes: "Datum" . Corridor Volumetric Flaws Broken link loop or undefined shape area. Building the Geometry (Points, Links, Shapes) Simulates how
: Creating drop-down menus for user selections (e.g., "Curb Type A" vs. "Curb Type B").
Real-world corridors must change behavior based on conditions. For example, if a road is in a "Cut" zone, it needs a ditch; if it is in a "Fill" zone, it needs a daylight slope. This requires conditional logic.
Drag a point. Set Type to Delta X and Delta Y . Set $\Delta X = CurbWidth$ and $\Delta Y = 0$ relative to P2.
4. Step-by-Step Tutorial: Building a Parametric Curb and Gutter
Set the point geometry to Delta X and Delta Y or Slope and Delta X . Link Points: Drag a Link tool to connect points together.
The storage center for all programming components. It contains geometry objects (Points, Lines, Arcs), Advanced Geometry, and Workflow items (Decisions, Switches). You drag these elements into the Flowchart.