Transparency, Texture, Shadows and Anti-aliasing
Ray tracing is an old technique, based on the numerical simulation of geometric optics intuitively, it can be seen that light rays could be traced from a light source along their paths until they reach the observer However, this is a rather wasteful approach, because only a few rays coming from a given source actually arrive at the observer. This is why the first algorithms involving ray tracing carried out the process in the opposite direction Rays are traced from the observer to the objects in the scene, as shown in Fig. 8.1 The first practical use of the ray-tracing technique in computer animation was the MAGI System [Goldstein and Nagel, 1971], which used the algorithm developed by Appel 
KeywordspartIcle System actIve Node Computer Animation Motion Blur VIrtual Camera
Unable to display preview. Download preview PDF.