Determining Ground Position

I'm looking for a way to determine the z position of the ground at a given (x,y) location. I was thinking maybe spawning some object that would fall to the ground due to gravity, but how would you know how high to spawn it? And then it would take time to fall as well. --MrFlippy

Even if you spawn it VERY high, it may collide with another object long before hitting the ground (an house's roof, for example, or a tree...). And, as you said, it will not fall instantly... --Bifmadeinsabbioni

I tried to do this by using a spawned object too. it would work, but if you want to move the object on its x and y axis together with an other object it doesn't work anymore, since the physical z movement seems to be terminated when te object is moved by a script function. --JustTim 08:13, 9 May 2006 (EDT)

What function do you use? set pos or move to? I think that set pos shouldn't terminate z axis movement