You could perform a step when the game loads, or outside of the game and store it as a data file, where the program performs a bunch of linepicks at regular intervals to create a grid array of heights, like a heightmap. Then you could interpolate between grid points to calculate the height of the mesh at any point. As long as you use a fine enough resolution of your grid it would work, and should be almost as fast as terrainy - which is really just a calculation based on the heightmap in a similar fashion.
MeshY like TerrainY?
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