Drape 3D Polyline On Surface
Function
This command converts a 2D polyline into a 3D polyline by
calculating 3D polyline vertices at
all the intersects of the 2D polyline with surface entities (contour
polylines, triangulation lines)
and by interpolating elevations from these intersections at the
original vertices locations. An
application for this command is to create breaklines. For example, a
ridge breakline could be generated
from contour lines by drawing a 2D polyline along the ridge and across
the contours. Then this
command could grab the contour line elevations along the polyline to
make a ridge breakline.
In addition to using entities in the drawing, the 2D polyline can be
converted to 3D using a
surface model stored in triangulation (.flt or .tin)
file. If you use a file, then you can also use the polyline's current
elevation as a vertical offset from surface.
Prompts
By Screen Entities:
Source of surface model [File/<Screen>]? Type S for Screen
Select polylines to convert.
Select objects: select the
polyline(s) to convert
Select surface 3DFaces, lines and polylines.
Select objects: select the surface entities (contour
polylines, breaklines, triangulation lines, etc)
Reading points ... 692
Keep existing polylines [Yes/<No>]? Press Enter
This command creates a new 3D
polyline, and this prompt allows you to keep the old polyline.
Set layer name for converted polylines [Yes/<No>]? Press Enter
This allows you to assign the new
polyline to a layer.
Converting polylines ...
Converted 1 polylines.
By a .flt or .tin File:
Source of surface model [<File>/Screen]? Type F for File
Select polylines to convert.
Select objects: select the surface entities (contour
polylines, breaklines, triangulation lines, etc)
Use current polyline elevations as vertical offset from surface
[Yes/<No>]? Press Enter
This will offset the new polyline by
its current elevation. That is, if a polyline has an elevation of -4
and the surface you are converting it to has an elevation of 800, then
saying Yes will drape the polyine at an elevation of 796.
Keep existing polylines [Yes/<No>]? Press Enter
This command creates a new 3D
polyline, and this prompt allows you to keep the old polyline.
Set layer name for converted polylines [Yes/<No>]? Press Enter
This allows you to assign the new
polyline to a layer.
Keyboard Command: 2dto3dp
Prerequisite: A polyline and surface lines or grid file or
triangulation file.