Scatterplots in VisAD?

I'm just starting out with VisAD and have been successful creating a
variety of 3D surface plots. Now, however, I want to make a 3D scatter
plots and I'm having trouble getting my mind around what to do. My
surface plots were derived from gridded data but the data behind the
scatter plots are just tuples. TIA

John Osborne
NOAA/PMEL
Seattle