I can't speak to clustering, but the screens you link to (very nice, 
BTW) are not ones prone to radiosity artifacts.  You have strong 
textures and mostly curved surfaces both of which tend to hide lighting 
imperfections.  If you want to find where artifacts may have occurred 
use a plane white texture in one of your renders.  That tends to make 
any artifacts stand out.

Peter MacMurchy wrote:

> Hello,
> 
> I have been rendering radiosity images on clusters for a few weeks now. 
> I am doing *absolutely nothing* to prevent/deal with the supposed
> "artifacts" that distributed radiosity rendering creates.  I cannot see
> any rendering artifacts.  Could someone please explain what these
> artifacts would look like & possibly point them out in the following
> images?  
> 
> http://homepages.ucalgary.ca/~psmacmur/images/poppy640.png
> This was rendered with SMPOV in 16 horizonal strips (Tiled 1x16)
> 
> http://homepages.ucalgary.ca/~psmacmur/images/beanstalk_potted_500x700.png
> This was rendered on several computers but i forget which or how many:
> 
> http://homepages.ucalgary.ca/~psmacmur/images/beanstalk_potted_filter_1500x2100.jpg
> This hi-res version of the previous model was rendered in 4 horizontal
> strips on SGIs using distribution/reassembly code based on Paul
> Bourke's: 
> http://astronomy.swin.edu.au/~pbourke/povray/parallel/ 
> 
> All use radiosity in conjunction with a very large dense area light.

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