If you're just removing part of the image after cutting around it with a tool like this, having the object interpreted as 3D isn't really going to be of any ben

If you're just removing part of the image after cutting around it with a tool like this, having the object interpreted as 3D isn't really going to be of any benefit. The impressive thing here, imho, is the seemingly effortless and seamless transition and replacement. The background is fixed and the surface texture is stretched in what seems like real time.