>> I think that what is interesting is that people have the tools to  
>> try new ideas even if you think  that they are idiot.
>
> Yes, that is good and interesting; the faster people ca try out  
> ideas and discover which ones are bad, the better it is. As we used  
> to say at Interval Research  - Fail Early, Fail Often.
>
> Squeak is definitely one of the tools I would consider valuable for  
> this. So is SketchUp, so is the Doom Programmers Kit (or whatever  
> it may be known as). So is modelling clay....
>
> And none of it stops me thinking that is a bad idea to  
> photophysically emulate a bad way of working. Sure it's cool that  
> you *can* do that that but that doesn't make it a good way of working.

Indeed.
I have no idea of 3D virtual space efficiency and I was more looking  
at the technical aspects.

Stef