In article <3c6aa79b@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   You are welcome to suggest an algorithm for that.

Hmm...sample initially in a cross or x pattern to find out if a thin 
object goes through the pixel? If one is found, supersample the entire 
pixel. It would be slower than the current adaptive method, because the 
minimum samples per pixel would be higher, but should be faster than the 
completely non-adaptive method.
Also, a multiple pass method might be interesting...render with no or 
very little antialiasing, then run additional supersampling passes. A 
faster preview, and you could let it refine the image indefinitely. A 
pixel could be supersampled if any of the nearby pixels hit an object 
but it didn't.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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