Am 06.02.2016 um 19:19 schrieb Sven Littkowski:
> Hi,
> 
> POV-Ray inserted this into the command line parameters, when I made an
> area render with an image size of 8000x4500 pixels:
> +sc0.248406 +sr0.444099 +ec0.441055 +er0.635475
> 
> I finished maybe a bit less than half of that area, had to stop. Now I
> want to continue, but need to know, how the float numbers above compute
> into row line numbers, because I have to alter "sr" consequently. Thanks.

The values specify the start and end in fractions of the screen size; so
e.g. if your image is 1920 by 1200 pixels in size and you specify
+sr0.25 +er0.75, POV-Ray will (or at least should, to the best of my
knowledge) render lines 300 to 899.

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