Get Y value of plane at position X,Z

I'm not great mathematician but i'm sure this is not a plane)

You're correct xD sorry about that, change the curved line to a straight lol, I was thinking about how to apply it to a proper terrain, so when I was drawing the diagram I put a curved line in there, but this method would be for proper terrains, because, well if I was just using planes then there'd be no problem cause the y value never changes.

I don't know if you have something special or are just new to Unity. The typical solutions is to put a collider on the object and Raycast() down. For a Unity Terrain, you can use Terrain.SampleHeight().

Gee thanks Sir High and $$anonymous$$ighty, even if I wasn't new to unity that's rather uncalled for. But thanks for telling me about racycasting anyway

Here's some links for future people if they ever need to know about it http://docs.unity3d.com/ScriptReference/RaycastHit-point.html http://answers.unity3d.com/questions/607226/get-height-of-a-mesh-by-x-and-z-coordinates.html