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