Chris Huff <chr### [at] yahoocom> wrote:
: 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. :-)

  I counted about 105 MB, not 10.5 MB. That's a whole lot more.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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In article <390dace8@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   I counted about 105 MB, not 10.5 MB. That's a whole lot more.

It sure is, you are off by a factor of 10.

1024*768 = 786432
5 color components per pixel at 2 bytes each, plus one depth value at 4 
bytes:
14 bytes per pixel

786432*14 = 11010048 bytes per 1024*768 image processed with filters 
using depth and color(the two most commonly used variables).

11010048/1048576(the number of bytes in a megabyte) = 10.5 MB.

Remember that only the necessary information is saved...I think 
"find_edges" and "normal" are the only ones which use normal 
information, and none use UV coordinates or intersection point. 
Including the post_process filters I made, the only ones which use depth 
are "stars", "normal", "find_edges", "focal_blur", and "depth". Most 
only use color information, which has to be stored in some form anyway. 
If only those filters are used, you have a 7.5MB temporary file for a 
1024*768 image.

-- 
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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Chris Huff <chr### [at] yahoocom> wrote:
: 5 color components per pixel at 2 bytes each

  You said earlier that the color components are stored as floats.

: Remember that only the necessary information is saved...

  I was calculating the worst case scenario, where everything is needed.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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In article <390ff368@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

> Chris Huff <chr### [at] yahoocom> wrote:
> : 5 color components per pixel at 2 bytes each
> 
>   You said earlier that the color components are stored as floats.

Of course, that should be 4 bytes.
That would be 15MB for filters which only use color, and 21MB for 
filters using color and depth. Not tiny files, but certainly a lot 
smaller than 100MB. And since the are *temporary* files, they are gone 
when the render finishes.


> : Remember that only the necessary information is saved...
> 
>   I was calculating the worst case scenario, where everything is needed.

That scenario is currently impossible to reach, the filters don't exist 
for it...and if it was possible, most of them would be wasted anyway, 
since some(like depth or normal) would completely replace previously 
processed images.

-- 
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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