> 11. I would like a "flag" ("/overwrite", for instance) that would
> update an existing image (assuming the same size and type) when
> selecting a screen region. For instance, I adjust the reflectivity of
> a small object, highlight just that object, re-render it and the
> rendered results are written "in the right spot" into the target
> image, instead of the original image being deleted.

Ray-tracing doesn't work like that. POV-Ray doesn't compute the
projection of an object onto the image; instead, it fires rays from the
image and works out which objects they hit. Besides, to do this it would
also have to update all the object's reflections, shadows, etc...

-- 
A most peculiar man    With the windows closed      And Mrs Reardon says
He died last Saturday  So he'd never wake up  He has a brother somewhere
He turned on the gas   To his silent world   Who should be notified soon
And he went to sleep   And his tiny room    .oO( http://sad.istic.org/ )

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