Terrain help

Blitz3D Forums/Blitz3D Programming/Terrain help

I need help finding the aprox. Y value of a point in the terrain. If thats how you would say it. So, say I want to put a point on say every square in a terrains grid. X is easy, and so is Z. But I can't find a fast in game way to get the Y. I've tried TerrainHeight, but that doesn;t help me at all. Is there some kind of scaling I'm missing? Any Ideas? or am I just talking non-sense. I am frying over this please help.