well I just ran my radisoity test. and yea I can see some problems when I 
rejoined the image. it really depends on the type of scene though, as the 
only part of the image that had a problem was some reflective stuff, I 
would imagine a scene with little radisoity would join back up without 
problems

so I guess all that needs to be done is have the ability to define the seed 
value ahead of time, or save the seed....

das### [at] x-pressnet (daishi) wrote in
<8F61C58CBdashixpressnet@204.213.191.228>: 

>woo### [at] accumuse wrote in <395A8AF1.91D7229D@acc.umu.se>:
>
>>daishi wrote:
>>> 
>>> ron### [at] povrayorg (Ron Parker) wrote in
>>> <slr### [at] linuxparkerrfwicom>:
>>> 
>>> >On 28 Jun 2000 18:40:05 -0400, daishi wrote:
>>> >>okay, so do it by line insted of by tile. send the first 10 lines
>>> >>to one comp, next 10 to another, etc. only problem you might run
>>> >>into is reassembling the images in the right order. pov-ray already
>>> >>supports this with its resume feature, just no one has written a
>>> >>way to do it distributedly
>>> >
>>> >Same problem.  Believe us, we've actually thought about this problem
>>> >and it's not as simple as you think.  (Why do I find myself saying
>>> >that more and more these days?)
>>> >
>>> 
>>> why won't it work? does pov-ray do some kind of image analysis when
>>> it resumes an image? I've done this with huge renders (say 10 lines
>>> one day, another 10 lines the next, etc) and I haven't had any
>>> problems 
>>
>>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,
>>if you
>>are using just antialiasing you might not see it, but try to do some
>>radiosity
>>and you should most probably get a somewhat noticable line where you
>>halted the
>>rendering, and then resumed.
>>
>>/Peter Toneby
>>
>
>I'll try doing a radoisity test, but I just did a test rendering with my
>method and everything rejoined fine. renderered the bottom third of my 
>image, then the first third, then the second. I didn't have any problems
>joining them back together
>
>if its just a matter of saving the random seed, I don't think that would
>be a major obstacle. or maybe just have the ability so the user can
>define the seed in their scene ahead of time.

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