small request,
in partial rendering (starrow, endrow) could the blank (not rendered) part 
of image be black, and could resulting image have full size (instead of 
putting rendered part at top of resulting graphics file)?

In addition I suggest an option that will not allow to output pure black 
(0,0,0 rgb).

In this case (0,0,0) rgb will work as magic "not-rendered" color and it 
would make putting partial renders togeather very easy.

To summ up, an option i.e. +MO (magic output) will effect output file:
  - to be PPM format (only this and .bmp do not have problems to open if 
render was aborted)
  - image will be filled with (rgb 0,0,0) pixels at start
  - then selected pixels would be rendered and put in corresponding 
positions in output file. And if any of rendered pixels is (rgb 0,0,0) it 
would be converted to (rgb 1,1,1) (in 0..255 range).

I also suggest an option +MM mask_file_name (magic mask), program will read 
mask_file, and will render only this pixels, for witch corresponding pixels 
in mask_file are equal (0,0,0). This  way not only this works as better 
addition to continue trace, but also it allows to render any part of image 
(i.e. two rectangonal regions + one circle) with can be usefull IMHO both 
in render farms and in working with previews.

Any comments?  If anyone finds this interesting I would like to create and 
donate such code. 

-- 
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics

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