Mussel (not muscle) growth

[Michael O'connell]

I am doing some work on the growth of marine mussels and I've come across
some problems with finding a way to show the 3-d growth vectors and their
influence on the final shape of the shell. This kind of thing might be a
little off topic for this list but any suggestions as to a program that is
sufficiently simple for an aspiring biology undergrad would be appreciated
Thanks All,
Michael O'Connell