This command converts a 2D polyline into a 3D polyline by
calculating 3D polyline vertices at all the intersects of the 2D
polyline with the surface definition contained in the selected grid
(.grd) or triangulation (.flt, .tin) surface file. The command then
interpolates elevations from these intersections at the original
vertex locations. An application for this command is to "drape"
linear features along a surface such as a 2D centerline. For
example, a 2D centerline may be created in the drawing and then
elevated to the target surface, thus providing a quick "profile" of
the centerline which can then be offset for left and right edges,
constructing a 3 dimensional model of the corridor
alignment.
When you first run the command, a dialog pops up for selecting
the desired surface file to use. Once selected, the following
prompts appear:
Loading edges...
Loaded 8788 points and 26097 edges
Created 17310 triangles
Select polylines to convert. select one or more 2D polylines
Select objects: 1 found
Select objects: press
Enter to conclude selection.
Use current polyline elevations as vertical offset from
surface [Yes/<No>]? press Enter to accept default.
Keep existing polylines [Yes/<No>]?
Set layer name for converted polylines [Yes/<No>]?
Press Y to assign a new
layer name or press
Enter
Converting polylines ...
Elevated 1 polylines.
Pulldown Menu Location: 3D Data > 2D to 3D
Polyline
Keyboard Command: 2dto3dpf
Prerequisite: polylines and a grid file or triangulation
file.