Nice tut Garry!
Now that you mentioned my cloud scetches, it came to me that I never
showed where I ended up
http://staff.csc.fi/jyrki.hokkanen/cloud_s.wmv
(lower quality but more universal mpeg1 format here:
http://staff.csc.fi/jyrki.hokkanen/cloud_s.mpg)
Another outdated issue - remember the Sibenic cathedral GI-renders? Well
I also rendered the Sponza Atrium
http://staff.csc.fi/jyrki.hokkanen/sponza1.jpg
One spotlight (sun) and a blue sphere (sky) are the only light sources
used. The Sponza model came from
http://hdri.cgtechniques.com/~sponza/files/
Cheers
Jyrki