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Table Of Contents
Creating a 3-Dimensional Grid Based on Cross Sections
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Creating a 3-Dimensional Grid Based on Cross
Sections
The 3D Grid command imports the section surface data along the alignment as
3D faces on the layer RDGRID, and can assign the 3D grid a vertical
exaggeration as it is imported. You can import the top, datum, and existing
ground surfaces using this command. This command is useful when a 3D
surface model needs to be generated (rendering, for example).
To create a 3-dimensional grid based on cross sections
1 From the Cross Sections menu, choose 3D Grid.
The command lists the alignment name, number, description, and the starting
and ending stations.
The following prompt is displayed:
Beginning station <1000.00>:
The default is the beginning station of the current alignment.
2 Enter the beginning station number, or press ENTER to accept the default.
A prompt similar to the following is displayed:
Ending station <4213.94>:
The default is the ending station of the current alignment.
3 Enter the ending station number, or press ENTER to accept the default.
The following prompt is displayed:
Surface points to import (Existing/Datum/Top):
The datum and top surfaces include all ditch and slope surfaces.
4 Specify the points to import:
n
Existing: The Existing option uses the existing ground surface data along the
alignment for the sampled swath width for the grid.
n
Datum: The Datum option uses the points defining the datum line to create
the grid. If you select the Datum option, the command prompts for the
Datum number to use. The default for this prompt is one (1).
n
Top: The Top option uses the points along the top surface of the applied
template to create the grid. The command prompts for the top surface
number to use. The default for this prompt is one (1). In order to use a top
surface, one must have been defined with the Edit Template options.
After you have specified the surface, the command prompts for the vertical
scaling factor. The command uses this factor to stretch the grid in the vertical
direction for relief magnification. This value defaults to <1>.
5 Enter a vertical scaling factor, or press ENTER to accept the default.
The command processes the station information and creates the grid.
Use the AutoCAD VPOINT or DVIEW commands to view the grid in three-
dimensional perspective.