saw this a while back, appologies if you’ve already seen it:
and
very impressive stuff, anyone know how they did it? the 3d engine I built a while back wouldn’t be able to handle nearly as many objects
Mark 
wow! how do they do that? do you need special sotware?
I think its all done in flash, there’ s nothing there that can’t be done with the right code but its the scale of things that gets me how did they get such a complex scene to run as quickly as that??
if it was all done in AS then i am very impressed, and totally shocked. How the hell do you do such a thing? its amazing!
starts burbleling in wonderment
just e-mailed them
edit
just got this reply!
**
Hi Olly,
thanks! you´re right it´s actionscript… kind of… most
parts are written in flash bytecode using flasm
(http://flasm.sourceforge.com).
I´m using portals and potential visibility sets, a technologie
also used in quake, I think. Maybe this is going to evolve
into a commercial library, will see.
best
Florian
:: mx3d.com ::
Flash 3D Virtual Realities
http://www.mx3d.com
flash@mx3d.com
Bismarckstrasse 52-54
50672 Cologne
Germany
fon: +49 221 5008798
**
hehe nice bit o’ detective work 
so flasm eh? that makes sense, it can make complex actionscript run up to twice as quick I think
not sure what the portals bit is about… anyone?
i think he might be talking about using the 3D environments as a GUI. Eg: pictures in one room, downloads in another etc…
