On the beginning I thought to put some drawing code within the definition
of the ::traverse(..scene) virtual functions of the Shapes, but it seems
to be very slow because I need to recalculate on the spot all the
data(vertices, surfaces..) of the shape that I want to draw.
I'm thinking about alternative data structures but I don't have many
valid ideas...
Is there anyone that already did the same work and that can give me a few
hints ?
Ivan R Vaghi.