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Mouse Coordinate Transformation

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Hello all, i know this topic has been discussed but i have a little twist to throw in.. I want to basicaly throw out the Y coordinate.. i want the X and Z world coordinates of X and Y screen point. Ive tried and swapping the Y and Z world coords do not do the trick =) Im looking for an effect similar to the one used in the Trainz Surveyor program at http://www.auran.com/koolthingz/trainz/moviez.htm .. the Y coordinate is based on the heightmap at the current mouse position (trivial).. The problem is the transformation of the z coordinate.. Does anyone have any insight on this, i know i am to use glUnproject ive used it in the past, but for this effect im assuming there are quite a few more steps or calculations. Thanks! Nat

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