news:3fd47ce9@news.povray.org...

>   The idea with partial renders is that you can for example put several
> computers to render parts of a single image and then have a program join
> all the parts. The rendered image is located at the beginning of the image
> file in each result.

The confusing part is that this not true when the rendered image starts at
+SCx.x with x>0.
The starting x position is apparently saved in the BMP while the starting y
is not. When I render +sc0.8 +ec0.9 +sr0.5, all the viewers I have return an
image with a strip of rendered bits at +sc0.8 +ec0.9 but at y=0. The
consequence is that it's not possible to layer directly the re-rendered part
on the original render and that it has to be repositioned by hand (I make
the pixels half transparent to make sure that the superposition is precise).
It's not a major issue for most people, but it still makes things a little
more difficult for the few who make composite POV-Ray images.
Ditto for TGA images, btw, with the difference that the lines below the last
one repeat it (they're interepreted as black in a BMP).

G.

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