1. A computerized method of generating and rendering over a digital communications network a photorealistic three-dimensional (3D) perspective view of a 3D object selectively positioned and angularly positioned within a 3D scene, the method comprising: selecting at a first computer an object with which there is associated a derived or companion low-resolution 3D object model, and a scene with which there is associated a derived or companion low-resolution 3D scene model; rendering at the first computer from the derived or companion low-resolution 3D object model, and from the small derived or companion low-resolution 3D scene model, a first, rudimentary, low-resolution 3D image of the 3D object in the 3D scene for purpose of previewing; manually interfacing with the computer and with software processes operating within the computer to size, positionally place and orient the selected 3D object in the low-resolution 3D image, and in the 3D scene, therein developing chosen scale and location and orientation parameters for the selected 3D object in the 3D scene; communicating from the first computer upon a digital communications network to a second computer identity of the selected object, identity of the scene, and developed scale, location and orientation parameters, all as image information; from the received image information in the second and any associated computer, selecting a high-resolution 3D model of the selected object, and selecting or developing a high-resolution 3D model of the scene; rendering in the second computer and any associated computer a second, photorealistic, high-resolution 3D composite image of the 3D object scaled, located and oriented in the 3D scene in accordance with the developed scale, location and orientation parameters; communicating from the second computer any associated computer upon the digital communications network back to the first computer the rendered second, photorealistic, high-resolution 3D composite image; and displaying at the first computer the rendered second, photorealistic, high-resolution 3D composite image.