Browse to your saved .pkt file, select the target palette, and click .
: The area for defining the subassembly's name, input/output parameters (like width or slope), and target parameters (offsets or surfaces). Standard Workflow for Creating Subassemblies A typical design process follows these six steps:
Set Start Point to P5 and End Point to P1 to close the geometry loop.
Added to lines to form surfaces (e.g., "Top" for the driving surface, "Datum" for the bottom of earthworks).
+-----------------------------------------------------------------------+ | Toolbox Panel | | (Geometry, Advanced, Auxiliary, Workflow, Supers, Variables) | +------------------------------------+----------------------------------+ | | | | Flowchart Panel | Preview Panel | | (Logic & Structure Tree) | (Visual Output Matrix) | | | | +------------------------------------+----------------------------------+ | | | | Properties Panel | Input/Output Parameters | | (Coordinate & Variable Input) | (Target & Parameter Setup) | | | | +------------------------------------+----------------------------------+ Toolbox Panel
Drag a second ( P2 ). Set its Type to Slope and Delta X . From Point: P1 Slope: GutterSlope Delta X: -GutterWidth (moving left from origin). Check the box to Create Link ( L1 ). Step 3: Build the Curb Face Drag a third Point ( P3 ). Set Type to Delta X and Delta Y . From Point: P2 Delta X: 0 Delta Y: CurbHeight Check Create Link ( L2 ). Step 4: Create the Curb Top and Back Drag Point P4 . Set Type to Delta X and Delta Y . From Point: P3 Delta X: CurbWidth Delta Y: 0 Check Create Link ( L3 ). Drag Point P5 . Set Type to Delta X and Delta Y . From Point: P4 Delta X: 0 Delta Y: -CurbHeight Check Create Link ( L4 ). Step 5: Close the Shape Drag a Link component into the flowchart. civil 3d subassembly composer tutorial pdf
For example, to determine whether a corridor is in a or Fill condition: Create a Surface Target named ExistingGround . Add a Decision switch to the flowchart.
The component acts as an IF/THEN statement within your flowchart.
Subassemblies built in SAC react instantly to changes in your Civil 3D model. 1. Navigating the Interface
Ensure the Civil 3D Corridor Target Mapping matches the exact name defined in SAC. Shapes fail to display or calculate material volumes Disconnected or un-sequenced link loops
Right-click on any palette tab and select . Browse to your saved
Common examples include: LaneWidth (Double), PavementSlope (Grade), and CurbHeight (Double). Target Parameters
Connect P4 back to P1 by dragging a object into the flowchart, setting its start point to P4 and end point to P1 ( L4 ). Step 5: Define the Shape Drag a Shape object into the flowchart.
: Contains the building blocks categorized as Geometry (Points, Links, Shapes), Advanced Geometry , Auxiliary components, and Workflow elements (Decisions, Switches).
is almost always the , anchoring the subassembly to the corridor baseline.
Master Civil 3D Subassembly Composer: A Comprehensive Guide For infrastructure professionals, the standard subassemblies provided in Autodesk Civil 3D often fall short of complex, real-world design requirements. Whether you are dealing with variable sidewalk widths, complex retaining walls, or specific regional drainage standards, the is your essential tool for custom corridor modeling. Added to lines to form surfaces (e
Drag a from the Toolbox to the Flowchart. It automatically connects to the Start node as P1 (Origin).
I can provide the exact logic flowchart steps and parametric formulas you will need.
The final step is to save your creation. SAC produces a .pkt (Package) file.
Add from P2. Set Type to Delta X and Delta Y . Set Delta Y to CurbHeight . Create Link ( L2 ).