Finds the closest ground surface below a world-space position using the game physics scene.
World-space X coordinate of the ray origin.
World-space Y coordinate of the ray origin.
World-space Z coordinate from which to search downward.
OptionalmaxDistance: number
Maximum downward probe distance in world units; defaults to 200.
The ground Z coordinate, or null when no surface is found, physics is unavailable, or maxDistance is not positive.
Client-side queries against the currently streamed Mafia II world.