p.s., Re: polyhedral cells

Once you've implemented CellFaceRendererJ3D, applications can
use it in calls to DisplayImpl.addReferences, as follows
 
  DisplayImpl display = new DisplayImplJ3D("display");
  display.addMap(...);
  ...
  display.addReferences(new CellFaceRendererJ3D(), field_data_reference);
 
There are other signatures of addReferences that accept an
array of ConstantMaps.
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
whibbard@xxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html