Reads the depth map pixel under a point.
coordinateSpace is the size point is measured in, normally the media's; the map is stretched over it the way the renderer draws it. Without it the point is in map pixels. Returns null outside the map.
coordinateSpace
point
Optional
Reads the depth map pixel under a point.
coordinateSpaceis the sizepointis measured in, normally the media's; the map is stretched over it the way the renderer draws it. Without it the point is in map pixels. Returns null outside the map.