Hi Andreas

Andreas Raab wrote:
>>I'm looking for a technical introduction to the squeak 
>>graphic subsystems: balloon and balloon3d.  [...]
>> Maybe there is some guide?
> 
> 
> Well, the best you can do is to read up in some general graphics text book
> as the stuff in there is essentially right out of the books.
> 

Which book (or books) are you thinking of in particular?

Regards
Hannes