In article <3A0AF5A6.8D03B49D@spiritone.com> , Josh English 
<eng### [at] spiritonecom>  wrote:

> That is very strange. Was this bottom left to upper right or bottom right to
> upper left? I still don't undserstand why the order the rays are traced matter
> so much. Any enlightenment?

Very simple:  Procedural texture are based on pseudo-random number
generators.  While you get the same sequence for every render, you do not
get a reverse sequence when you render from bottom to top.

You would have the same problem with any other render algorithm that splits
up the image as well.  This is also one of the complicated issue when it
comes to making POV-Ray multithreaded or do network rendering of single
frames.


    Thorsten


____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

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