Igor Stasenko wrote:
> Gary, i suppose you heard about Croquet/OpenCobalt. Why you don't want
> to use them instead?

Because neither is geared towards teaching how to program. Unless you 
are planning to give a course on how to build a replicated 3D 
environment, the learning curve will be a bit steep ;-) There isn't even 
any scripting to talk of in Croquet / Cobalt. Except from some initial 
experiments we never got around to doing anything in that direction.

Cheers,
   - Andreas