Certain types of holographic recording materials can be used to updateably
record holographic stereograms formed when fringe patterns are generated
through interference of an object laser beam containing image information
with a reference laser beam. In this manner, calculation of fringe
patterns is avoided, and instead perspective information is computed for
a scene or object to be displayed, the information is downloaded to
display hardware such as a spatial light modulator, and fringe patterns
are subsequently generated through interference of an object laser beam
containing this information with a reference laser beam in the classic
hologram recording scheme. Previously recorded holographic stereograms or
component hogels are updated by erasing the stereograms or component
hogels and recording updated stereograms or component hogels, or by
recording updated stereograms or component hogels in a separate portion
of the holographic recording material.