Impressive ! Couldn't imagine it was soooooo easy. Thanks.
@Chrisir. Thanks for your kind proposition, but my problem is solved. And I 
had to know how to do it, I'll have the same problem later, so...

42e5575c@news.povray.org...
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> bancquart.sebastien wrote:
> | #declare leaves=union {
> |     object {leave} matrix <....>
> |     object {leave} matrix <....>
> |     object {leave} matrix <....>
> | ...   ... about 24000 lines like that
> | }
> |
> If you have one line per object and nothing else in the file
> (not even the "#decleare leaves=union {" and "}" lines, then the
> following python code should do what you want:
>
> ############################################################
> from random import shuffle
>
> f = open ("file.inc", "r")
> l = f.readlines()
> f.close()
> shuffle (l)
> f = open ("one.inc", "w")
> f.writelines (l[:len(l)/3])
> f.close()
> f = open ("two.inc", "w")
> f.writelines (l[len(l)/3:(2*len(l))/3])
> f.close()
> f = open ("three.inc", "w")
> f.writelines (l[(2*len(l))/3:])
> f.close()
> ############################################################
>
> Note that if you have kept the first and last lines in the input
> file, you can get rid of them by replacing line 4 by:
> "l = f.readlines()[1:-1]"
>
> Jerome
> - --
> ******************************
> *      Jerome M. Berger      *
> *  mailto:jeb### [at] freefr   *
> *  http://jeberger.free.fr/  *
> ******************************
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