In a very broad sense the historical development of computer
graphics can be considered in three phases, each a giant step down
the road towards "realistic" computer generated images. The first,
during the late 1960's and early 1970's, can perhaps be
characterized as the "wire frame" era. Basically pictures were
composed of lines. Considerable em phasis was placed on "real time"
interactive manipulation of the model. As models became more
complex and as raster technology developed, eliminating the hidden
lines or hidden surfaces from the image became critical for visual
understanding. This requirement resulted in the second phase of
computer graphics, the "hidden surface" era, that developed during
the 1970's and early 1980's. The names associated with hidden
surface algorithms read like a who's who of computer graphics. The
cul mination of the hidden surface era and the beginning of the
current and third era in computer graphics, the "rendering" era,
was Turner Whitted's incorporation of a global illumination model
into the ray trac ing algorithm. Now the goal was not just to
generate an image, but to generate a realistic appearing image."
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