Maybe someone still remembers that I promised to experiment with 
the following idea: Instead of tracing all pixels one could try to 
interpolate some of them. 

In an effort to save rendering time (and reduce image quality as 
an unavoidable side effect), I wrote a patch for UNIX povray. 

The patch and some images (with and without interpolation) together 
with a short explanation about how it works are available at 
http://www.cip.physik.uni-muenchen.de/~wwieser/ani/povray/ipt-patch/

Please check the above page. 
I don't know if further development of this patch is worth the effort. 
Any comments or ideas welcome. 

Wolfgang

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