2D to 3D Polyline by Screen Entities

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 or valley breakline could be generated from contour lines by drawing a 2D polyline along the ridge top or valley bottom, crossing the contours. Then the command would "grab" the contour line elevations along the polyline to make a ridge or valley breakline.

Prompts

Select polylines to convert. select polylines
Select objects: 1 found
Select objects: press Enter to conclude selection.
Intersection extend tolerance <0.1>: enter value for "near" intersections that so not quite intersect.
Select surface 3DFaces, lines and polylines. select source 3D objects
Select objects: Specify opposite corner: 7 found
Select objects: press Enter
Reading points ... 5353
Keep existing polylines [Yes/<No>]? press Enter to accept defaults in brackets
Set layer name for converted polylines [Yes/<No>]?
Converted 1 polylines from 24 intersections.

Pulldown Menu Location: 3D Data > 2D to 3D Polyline
Keyboard Command: 2dto3dps
Prerequisite: Polylines and 3D surface entities