How to extrude from ground?

If I have a polyline above ground, is there some simple way to do the following:

  1. Show lines that go from the line down to the ground?

  2. Set the line as a geodesic polyline?

In google earth, there is a simple tag in KML that you can set to make it so that lines appear from every point of the line down to the ground so you can tell how high above the ground it is.
Is this possible or not?

It seems that polylines are geodesic by default, and you’d have to set a followSurface : false to make them otherwise.

Perhaps walls do as you ask?