> Oh, one feature would be quite useful in test renderings: let the user
> select a rectangular area in the image and the renderer starts to render
> only that area until told otherwise. That way the user can quickly get
> high quality renders from interesting areas. This should be a piece of
> cake implementationally.

This was a definite keeper. Works quite well in practice. See the image.
(Don't mind the odd noise. Image is scaled so the noise looks odd.)

Now I can select areas of interest and let the program render only that
area.

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