Adding
Source Data with 2D PolygonsAdding
Source Data with 2D PolygonsAnother way to generate the site model source data is to draw, trace, or import 2D polygons representing contours; then use the 2D Polys to 3D Contours command to convert the polygons to 3D polygons.
The Modify by Record command can convert 2D polygons or polylines with attached record elevation data directly to 3D contours at the proper elevation. See Modifying Objects by Record Value.
To generate source data with the 2D Polys to 3D Contours command:
1. Create or import the 2D polygons representing contour lines.
Polylines cannot be used. If contours are drawn with polylines, convert them to polygons first with the Modify > Convert > Convert to Polygons command.
2. Select the 2D Polys to 3D Contours from the appropriate menu:
● Landmark workspace: Landmark > Survey Input > 2D Polys to 3D Contours
● Architect workspace: AEC > Survey Input > 2D Polys to 3D Contours
The 2D Poly to 3D Contour Setup dialog box opens. Enter the first elevation and change in elevation between contour lines, and then select the type of object to be created.
Click to show/hide the parameters.
The Set Elevation dialog box opens, and the first polygon in the drawing order is highlighted. If necessary, use the Up or Dn buttons to set the elevation of the highlighted polygon, and then click Next. When prompted, indicate whether to delete the original 2D polygons.
Click to show/hide the parameters.
4. Repeat for all of the polygons in the drawing.
To interrupt this process, click Done. To resume setting elevations, select the starting polygon and select the 2D Polys to 3D Contours command.
Either 3D polygons or loci are created from the 2D polygons, with Z values equal to the assigned elevations. These Z values can be edited in the Object Info Palette if they are incorrect.
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