OK - I know how Matrix Ground Height Works - its based on tile intersections - but to get the REAL height of the "Ground" anywhere inside a tile - you gots to do some real work.
I am not schooled in these matters but I would think you take the tile's four corners (of the one you are over) and diagonally calc the differences from say the top left corner and the bottom right corner - halve the difference and add that to the lower height of the two.
Do that the other way (top right to bottom left) then take THOSE two results and again find the differences and add them to the lower one.
I there a command that gives you REAL height of matrix based on its position AND the XYZ points in question (not tiles... Actual Calc'd height between matrix points)
-=/Jaze/=-