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====== GetTerrainVector ======
GetTerrainVector(<-cellX <-cellZ) ->vector

===== Description =====
Gets the integer height of the terrain at the specified integer map coordinates and returns it as the y position in a vector.  A value of 0 means "void" or no terrain.
The X and Z values of the vector are also filled in with the supplied cellX and cellZ arguments
A value of -1 is returned if the terrain coordinate is outside the map.
===== Examples =====
<code 4rpl>
GetTerrainVector(42 23) ->v
PrintAllSP(<-v.x <-v.y <-v.z)
</code>
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