On Thu, 29 Jun 2000 01:32:01 +0200, woo### [at] accumuse wrote:
>If I understand things correctly you don't get the same random seed
>every time
>you start a render, this leads to the images not fitting together as
>nice as
>they should, this is very noticable if you are using radiosity. Since 
>povray
>doesn't store the seed it will not be able to make your scene perfect,


It's not about a random seed; it's about the radiosity cache.  When POV
samples an area for radiosity calculations, it saves the result of the
sample and reuses it later if it needs something sufficiently close by.
If you abort the render and restart it later, POV starts over with the
default radiosity cache (that's what it's building when it does the 
required mosaic preview) that doesn't contain all the fine-grained 
samples it had at the end of the previous run.  Thus, the samples on
the first scanline of the new region probably looked at a point further 
away, or a slightly different point, than the samples on the last line
of the old region, leading to subtle tonal variations.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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