Cropping Surfaces

2012-03-14

Product Documentation

Intermediate

Use the Create Cropped Surface command to create a surface that is a copy of a polygonal area of a source surface.

Each cropped area becomes a separate surface object (a new surface) that you can manage and manipulate.

When you create a surface by cropping the source surface, or when you rebuild the new surface, AutoCAD Civil 3D creates a copy from the saved version of the source surface. If you modify the source surface and want the changes to be reflected in the new surface, save the drawing containing the source surface before you rebuild the new surface.

Note

When a new surface is created, AutoCAD Civil 3D takes a snapshot of the new surface. To rebuild the new surface, you must first perform the Rebuild Snapshot command and then the Rebuild command.

To crop a surface

Click Home tab Create Ground Data panel Surfaces drop-down Create Cropped Surface.At the Command prompt, enter CreateCropSurface.
In the Create Cropped Surface dialog box, Crop Information section:
1. Click to select the source surface to crop.
2. Click to specify the crop area in the drawing using the selection window, by drawing a polygon, or by selecting objects.
  
  Note
  If you use the select objects option, click inside the polygon you want to use. The specified crop area is highlighted.
Specify the new surface information:
1. Specify a destination for the new surface. You can place it in a new drawing, in any existing drawing, or in the currently active drawing.
2. Enter the surface name and description.
Depending on the type of drawing that you selected in the previous step, specify the destination drawing for the cropped surface.
Optionally, modify the surface style. By default, AutoCAD Civil 3D applies the standard style to the created surface.
Click to assign a layer for the cropped surface.