Drape polyline to TIn

in Vector Data
Any ideas on how to drape a closed polyline to a TIN and only get 3D vertices where the polyline hits the tin line?
Answers
Using the digitizer select polyline, then right click "Vertex Editing", then "Edit Feature Vertices" then "Update Elevations from Terrain"
Using Andy's method, Global Mapper will, for each vertex in the polyline, determine the elevation at that x,y, and it to the z-value of the vertex. Each resultant new vertex will be on the surface of the TIN; however, the resultant 3D polygon will most likely not drape exactly onto the TIN surface, as no intermediate points for the polygon are created.
If you want a finer approximation of the terrain surface along the polyline, you can resample the line: "Move/Reshape Features" / "Resample/Split Selected Feature(s) at Specified Spacing". You should be able to do this either before or after updating the elevations from the terrain.
Hope that this helps,
~Jeff
@JeffH@BMG
Thanks for the information, but not exactly what I was looking for as a solution. Let's say one of my vertices from the picked polyline falls in the middle of a face. I would like the elevation of the vertice to be on the plane of the face and new vertices computed where the line crosses the edge of the triangle both entering and exiting the face and not on a spacing. Hope this makes sense.
I'll give that a try.
After much experimentation, I still do not have a solution. I need my draped line to match the facets of the TIN exactly. I actually need a TIN surface not a GRID surface. How do I get a TIN surface?
Your Area Feature and the Points will be an exact match to the TIN mesh and the vertices are only created where the original polygon intersects the TIN mesh. This workflow does not require you to generate a gridded terrain.
Cheers,
Steve