In article <390abfe6@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   That's right, but I was referring to the coloring function only. 

Coloring function? You mean filters that only adjust the colors? Some of 
those would depend on multiple pixels too.
Filters are applied in order...you can't do 1-pixel filters first and 
only save the data in a file if a filter like blur is used. You would 
have to add a completely different filtering system to the code, it 
would make code maintenance and filter coding harder, and would really 
not have much of a benefit.
I really don't see the problem with the file caching idea...it is used 
for photon mapping, radiosity, etc. It is also what is used in image 
editing programs. I would like to see it extended to allow load_file and 
save_file, so the render doesn't have to be redone every time...the size 
really only becomes a problem on large render sizes with every possible 
filter, something that would be quite rare. Most filters only require 
color information, and only the necessary data is saved. If space is so 
tight that you can't have a program generate a temporary file about 
10.5MB (1024*768*(5*2-byte color components + one 4-byte depth 
component, color and depth seem to be the most commonly used)), I 
suggest you clean out your hard drive. :-)


> The other filters will still need data from the whole image, but 
> hopefully not that much.

?
They will still need all the data they needed before...and if one 
multi-pixel filter is used, all of the filters would have to be done the 
way things currently are done.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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