When baspl++ is started normally, it
already contains the default Scene; thus, in most
cases, creating Scene objects is not necessary.
Sometimes, however, one wishes for instance to display the same
NPart from different angles simultaneously. Any
number of additional Scene can be created by
either selecting File->New->Scene from the main
menu, or by issuing
my_scene = Scene()
In both cases, a new (empty) Scene window
will appear on the desktop.
