> By the way, in case anyone is interested:
>
> On my machine, the Squeak port renders David's 640x480 sample
> image in 174 seconds.

Is this with the FloatArray>>dot: primitive enabled? It was commented out a
while ago due to a bug but try to enable it - should probably result in a
good 30-40% speed improvement ;-)

Cheers,
  - Andreas