Agustin Britait Molina <agu### [at] hotmailcom> wrote:
> The idea is save render time calculating a high percentage of the image at
> "low trace rate", then recalculate the rays at more trace level for pixels
> undefined in prior pass.

  I think that what you are looking for is this:

http://povray.org/documentation/view/3.6.1/258/

-- 
                                                          - Warp

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