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Table Of Contents
Chapter 1 Using the Grading Commands
72
Daylighting
The Daylighting commands calculate slope daylighting from a polyline
footprint to a surface, based on slope criteria. These commands calculate the
daylight match line that is drawn as a 3D polyline. Elevational points and
breaklines can also be generated to represent the daylight slopes. All of these
elements can be used to generate a surface.
A 2D or 3D polyline with elevational information is used to represent the
footprint. Cut and fill slope information is assigned to each vertex on the
polyline. Additional vertices can be added to the polyline for increased daylight
line sampling. Based on the polyline footprint elevations and the assigned slope
information, the daylight line is calculated at each vertex of the footprint
polyline for a selected daylight target surface.
Selecting the Daylight Surface
You can select the surface to use for calculating daylight lines. This is the
surface that you want the slopes to match into. Surfaces are created from the
Terrain menu.
To select the daylight surface
1 From the Grading menu, choose Daylighting รค Select Daylight Surface to
display the Select Surface dialog box.
2 Select the surface that the slopes intersect.
3 Click OK.