Many image formats support telling in their header the canvas size as
well as the image size and offset.
  The canvas size can be bigger than the image size, meaning that the
image data in fact contains only a part of the whole image.
  Programs will always be able to read correctly such an image (I suppose
some programs simply ignore the size of the canvas and image offset given
in the header, while others create an image of the size of the canvas and
draw the image data in the proper offset inside it).

  It might be a good idea to make POV-Ray save partial renders in this way.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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