Hello Lennie,

some additional remarks.

1. Since you mentioned a start and a stop button, I assume you're using the
windows version. In this case you don't need an ini-file. Simply type +c into
the command line field (the one below the show-, ini- and sel-run-button) and
better do so for the second and all subsequent runs and not for the first, as
John suggested.

2. The radiosity settings you gave, have to be specified within the pov-file
within the global_settings. The inclusion of "rad_def.inc" seems to be redundant
here, since it is not used. The definitions of p_start and p_end_final are fine,
but produce long rendering times for the radiosity
step.

3. The parsing of the scene is not part of the "continue"-option. Every time you
you restart a Rendering with +c the whole scene will be parsed again.

4. For photons it is the best to save them during the first render, and load
them in subsequent ones.

5. radiosity can be saved with the first run, but you need other global settings
to load them. And an ini-file is needed in this case.

6. radiosity is recalculated with every retrace, but only the part which is not
rendered already.

7. The continue-option is still a bit buggy. Having a multi-core machine you are
only save if you stop the rendering when the rendered area is "closed" in a way.
That means, if you use the default render pattern, all blocks
left and above the last rendered block must be rendered. If one is missing, the
resume option will forget and not render it.
See

http://news.povray.org/povray.binaries.images/thread/%3C5239bc36%40news.povray.org%3E/?ttop=390778&toff=50

for an example.

Best regards,
Michael

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