Motion blur is the simulation of the phenomenon that occurs when we perceive a rapidly moving object. The object appears to be blurred because of our persistence of vision. Doing motion blur makes computer animation appear more realistic. It can be thought of as adding back some of the time dependence expressed in the Rendering Equation.
If we compute an image, e.g. a single frame of an animation, without motion blur, the process is as follows:
When we include motion blur, this is modified by the following (as an approximation):
Here are two examples of motion blur, as rendered in the Pixar Renderman system.
The first image is of a partially closed sphere, without motion blur.
The second image is of the same sphere closing, with motion blur.
The third image is of the sphere moving, with motion blur.
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Last changed January 8, 1996, G. Scott Owen, email@example.com