Leander wrote:
> [...]How can I avoid this
> and make povray create an image only of the size of the
> wanted part? I didn't find an appropriate command line
> switch.

There isn't.

The partial images are usable though - i once wrote a small shell script 
that extracts a selected part from such an image:

http://www.imagico.de/pov/img_crop.sh

> 
> 3) Is there any limitation to the size of the resulting image?
> Part of the image or the whole image?

You should turn off display of course but apart from that - no*.  Except 
of course limitations of the file system concerning file size and size 
limits of the image file formats.

*) up to the usual numerical limits of 32bit integers (2.1 billion)

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.imagico.de/ (Last updated 14 Mar. 2006)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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