Sven Littkowski <I### [at] SvenLittkowskiname> wrote:
> Thanks, Clipka.
>
> Based on that experience, it would be my suggestion to add some message
> stream feature to POV-Ray that allows better progress control on photon
> mapping, or even error checking.

Keep in mind that you misconfigured photon mapping really badly: POV-Ray cannot
catch unfortunate user settings very well because it is extremely hard to tell
(basically impossible) if a setting a user selected is intended or a mistake.
What might be a proper setting in one case might be a real mistake in another.

Given every check for progress reporting takes time, the proper cases would be
severely penalized by the time taken to check for the mistakes. The lack of
progress on the other hand is the clear indication that something is wrong. So
you are getting feedback by means of the render time...

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