I could not find a command line switch for, nor any mention of, periodically
saving the image to a file while rendering it. Is this done automatically? I'm
not talking about animation. I'm talking about rendering a single very high
resolution image.

I see how to initiate a controlled abort, and how to resume where you left off
later. What I'm not sure about is how to resume from a power outage, which would
effectively be an uncontrolled abort. If POVray provides no way to periodically
and automatically save what has been rendered so far to a file, that does not
bode well. Please tell me I am wrong about this. Thanks for any clue.

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