Hi all...

Some time back, I had the idea that one could implement progressive 
refinement for POVRay -- something like anti-aliasing for larger pixels. 

Sombody else suggested in some news group that it would be nice to use 
the mouse to manually select regions to be drawn. 

Yesterday, I sat down and wrote a patch which does both these things. 

The final image will look just as it does with normal povray because 
all pixels are traced in the end. However, the patch enables you to 
see the important things earlier during rendering. And: it has little 
overhead. 

See description and example scene (Alex Kluchikov's isosurface) here: 
http://www.cip.physik.uni-muenchen.de/~wwieser/render/povray/prt-patch/

In case somebody is interested in porting it to windows/mac, please 
contact me. 

Any feedback/comments is appreciated. 

Regards,
Wolfgang

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