Height map shape for 3D physics. Height map shape resource, which can be added to a [PhysicsBody] or [Area]. Height map data, pool array must be of [member map_width] * [member map_depth] size. Number of vertices in the depth of the height map. Changing this will resize the [member map_data]. Number of vertices in the width of the height map. Changing this will resize the [member map_data].