"stevenvh" <nomail@nomail> wrote:
> This should not be too hard, and the change is limited to saving. (It doesn't
> involve the render engine, for instance.)

It appears more problematic than you suggest.  As the documentation reflects
(and Wolf mentioned above):

"If POV-Ray wrote the actual height of the partial image into the image header
there would be no way to continue the trace in a later run." (3.1.2.2.2)

This behavior was a deliberate choice.  Not that this means the behavior
shouldn't be reconsidered, just that it isn't arbitrary or accidental.

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