if I'm not mistaken there is a way to save the radisoisty file in pov-ray. 
would making sure each time you did radisoity you saved the file work 
around the problem?

ron### [at] povrayorg (Ron Parker) wrote in 
<slr### [at] linuxparkerrfwicom>:

>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.
>

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