Nicolas Calimet wrote:

>> Please check the above page.
>> I don't know if further development of this patch is worth the effort.
>> Any comments or ideas welcome.
> 
> The concept and realisation look pretty good, and you probably
> had some hard/fun time making it, so for that matter it's worth doing
> it  :-)
> However, as you admit yourself, the results are a bit frustrating,
> especially for regular geometries like checker, and those weird artifacts
> on projected shadows for instance. 
>
Well, some artifacts may be tolerable but what happened to the checker 
on the left definitely is NOT. 

Does anybody have good ideas on how one could calculate a good aproximate 
of the image with about 6-10% of the pixels?

I read about some other people implementing "progressive evaluation" 
which means that the final image is equal to the completely traced image 
(because all pixels are actually traced) but you get a very good 
approx of the image with only 6-10% of the pixels traced. 
However, they use tricks like projecting the boundary of objects on 
the viewport. Could that be done easily with POVRay?

It would be an idea to implement just that. It would be better than 
mosaic preview and one could stop after, say 15% if one wants to create 
a rough animation. Hope this does not result in annoying flickering 
artifacts...

Wolfgang

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