Motion Blur – What is it? How do we get it?
The human eye does not see motion as most com puter renderers see it. The human eye does not see motion as a continuous set of instantaneous pictures. The human eye sees motion through persistence of vision. Our eyes are constantly taking visual data from our surroundings, the data our eyes feed to our brains is not sampled. This is a difficult effect to achieve on the computer. There are algorithms that allow a computer to achieve real motion blur, but these tend to be really slow if your using a large number of polygons. They get even more complex, and even slower, if you start moving objects along spline paths (if you’re interested, and have access to a good library, check out Computer Graphics, Volume 17, Number 3, July 1993, Temporal Anti-Aliasing in Computer Generated Animation). Much faster ways of approximating motion blur exist. These approximations hide some of the temporal-aliasing (aliasing over time) while the real motion blur method completely eliminates it. Some programs
