> but POV-Ray will render the selected area and leave the
> whole image empty around it.

What POV-Ray does, and what he's talking about, is renders the selected area
in the wrong area of the output image.

For instance, if you select a square at the center of your image, the
outputted file will be black everywhere but the *top* middle, where your
selected render will appear. One would expect blackness everywhere but the
*center*, which is where your selection was.

It's hard to explain exactly. If you haven't seen it before, then take any
old image, select a small square to render somewhere near the center of the
image, and then view the output image (not just POV-Ray's display), and note
the difference between the output image and what POV-Ray displayed.

 - Slime
 [ http://www.slimeland.com/ ]

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