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.

Intersection extend tolerance: Sets how far past the ends of the polyline to check for intersections.
Ignore Zero Elevations: Filters out any intersections at zero.
Extrapolate end elevations: Sets the start and end polyline elevations by extrapolating the last slope.
Keep existing polylines: Creates separate 3D polylines and leaves the original 2D polylines unchanged. Otherwise the original polylines are changed to 3D polylines.
Set layer name for converted polylines: Changes the layer name of the elevated polylines.

Prompts

2D to 3D Polyline dialog
Select polylines to convert. select polylines
Select objects: 1 found
Select objects: press Enter to conclude selection.
Select surface 3DFaces, lines and polylines. select source 3D objects
Select objects: Specify opposite corner: 7 found
Select objects: press Enter
Reading points ... 5353
Converted 1 polylines from 24 intersections.

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

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