Complex model systems can be difficult to depict using static images. Some phenomena are not apparent when viewed at a single instance in time. Many such things become much clearer, easier to detect and understand when they can be presented as moving, changing, evolving entities. For this reason, a set of tools have been created to help users generate motion picture sequences of systems modeled with BRL-CAD *|*.

Raytracing is a fundamental analysis and rendering technique within BRL-CAD. *|* Most users of BRL-CAD are acquainted with the use of the program ``rt'' for creating still images. A relative few understand how to utilize its capabilities for generating animation sequences or ``movies.'' This paper introduces some of the tools and techniques available for creating animation sequences with ``rt.'' A basic knowledge of BRL-CAD, the geometry editor ``mged'' and image creation using ``rt'' is assumed.

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