! Objects in are composed of relatively simple primitive objects. These primitives may be used by themselves, or they may be combined to form more complex objects known as aggregates. A special family of aggregate objects, *************** *** 15,21 **** An instance is an object that has optionally been transformed and textured. They are the entities that are actually rendered by ! rayshade; when you specify that, for example, a textured sphere is to be rendered, you are said to be instantiating the textured sphere. An instance — 15,21 —- An instance is an object that has optionally been transformed and textured. They are the entities that are actually rendered by ! ; when you specify that, for example, a textured sphere is to be rendered, you are said to be instantiating the textured sphere. An instance *************** *** 25,33 ****