It is often useful to be able to plot the rays for a given environment
for illustrative purposes. Also for high-frequency problems the ray
model provides results more rapidly. The results are almost inevitably
less accurate than * KRAKEN*
or * SCOOTER*
calculations but sometimes the
inaccuracy is negligible.

* BELLHOP*
is not particularly efficient as
far as ray models are concerned, nor is it very general. With regard to
efficiency the model actually is set up internally to do a full range-dependent
ray trace while it allows only for a range-independent input structure.

* BELLHOP*
differs from standard ray models in using a robust variant of
Gaussian beam tracing referred to as geometric beam tracing. For those familiar
with traditional implementations of ray tracing, the results are often
astonishingly accurate.

Tue Oct 28 13:27:38 PST 1997