[JAVA3D] Terrain following

[Edward Becker]

From the amount of terrain questions posted to this list, I'm sure this will be useful to many and known by others.    I have a terrain, using Y as the height.  I want to keep an object, at all times, a certain distance above the terrain.  Whats the best way to do this?  (The terrain is made up of a bunch of quads represented as Shape3D)   Thanks!