Thorsten Froehlich <tho### [at] trfde> wrote:
>> The current mosaic preview adds rendering time because the pixels
>> rendered in the preview are not used in the final rendering.

> Yes.  I know it is intentional, but I do not know why.

  I suppose that it's because of the history of POV-Ray.
  Back when 2 megabytes of RAM was a whole lot of memory in high-end
home computers, keeping a whole image in memory was completely out of
question. Reusing the pixel values calculated during the mosaic preview
would mean that they would have to be stored on memory, which was unbearable
at that time (that's why POV-Ray only keeps a small buffer where it writes
the current pixels and then flushes it to the image file).
  With current computers there's no problem in keeping the whole image
in memory, so there's no such problem anymore. However, no-one has touched
that code since then, I suppose. :)

-- 
#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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