Create a Surface from Polyline in Civil 3D

How to Create a Surface from Polyline in Civil 3D 2022

To create a surface from polylines in Civil 3D, follow these steps:

Step 1: Prepare Your Drawing

1. Open Civil 3D 2022 and import or open the drawing file containing the polylines.

1. Make sure your polylines represent the surface contours and have elevation values assigned.

 Step 2: Assign Elevations to Polylines (If Not Already Assigned)

1. Select a polyline that represents a contour line.

1. Right-click and select Properties.

1. In the Properties palette, go to the geometry section and set the Elevation value.

1. Repeat this process for all polylines with their respective elevation values.

 Step 3: Create a New Surface

1. Go to the Prospector tab in the Toolspace.

1. Right-click on Surfaces and select “Create Surface...”.

1. In the Create Surface dialog box:

• Enter a Surface Name (e.g., “Polyline Surface”).
• Select the Surface Style (e.g., Contours 1m and 5m).
• Click OK.

 Step 4: Adding Polylines to the Surface

1. Expand the Surface Name (e.g., “Polyline Surface”) under Surfaces in the Prospector tab.

1. Right-click on “Definition” and select “Breaklines”.

1. In the Add Breaklines dialog box:

• Enter a Description (e.g., “Polylines”).
• Set the Type to Standard.
• Click OK.

1. Select the Polylines you want to add to the surface.

1. Press Enter to finish the selection.

 Step 5: Rebuild the Surface

1. Right-click on the Surface Name (e.g., “Polyline Surface”) under Surfaces in the Prospector tab.

1. Click on “Rebuild” to update the surface with the added polylines.

 Step 6: Viewing the Surface

1. Right-click on the Surface and select “Surface Properties”.

1. Change the Surface Style if needed (e.g., Contours 1m and 5m, Triangles).

1. Click Apply and OK.

1. Your surface from polylines is now displayed in the drawing.

 

Tips:

• Make sure all polylines have elevation values assigned before creating the surface.
• You can also add polylines as Contours instead of Breaklines if they are meant to represent elevation data directly.
• To improve surface quality, add more breaklines and boundaries if needed.

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