Do you mean GROUND height?
If so Try to use the get ground height() command. (if you are using a matrix.) Look it up in DB help, it's quite simple, really. If your using a mesh then I'd imagine you would use the nuclear glory collision DLL. (I can't really say because I don't have nuclear glory)
If you're using get ground height() then I have some advice for you.
If one object is chasing another (One object points itself at the
target and moves til it's in range) then make sure that if you position the target above the martrix like so,
Position object whatever x#,get ground height(x#,z#)+35,z#
or whatever that you have the persuer point at those same coordinates or else when he reached the target he'll fall flat on his face. (It's actually kind of funny)
also, If you find that the object keeps wobbling with every contour of the matrix then establish its x and z angles at zero.
Place these commands in the main loop so that they keep your dudes on the ground
Now all the experienced coders are gonna tell me how crappy my code is.
Completed Doucan movies: Doucan year of the Monkey, Doucan II: the revenge of Mortakia. Current project: Doucan movie DVD resoration. Progress: 20%