I believe that Corel Dream (with the Corel Draw 6 package) will let you
define spheres by inputting parameters. Otherwise there are numerous
cad software packages that will do so. You can download many through
Ziff Sofware on compuserve and you may be able to find some 3-D graphics
utils at www.shareware.com
Chris Jerome
cjrm at troi.cc.rochester.edu
