|
 |
Sorry, not quite sure how to apply this. Could you throw in a demo scene
file using the random value for, say, the r value in an rgb vector?
thanks much,
D.
"Pete" <Pet### [at] nym aliasnet> wrote in message
news:232### [at] nymaliasnet...
> Here is an include file containing two macros that can
> be used to get scenes that have a different random number seed
> each time they are run. A file called "randseed.pov" is created
> to store the seed between renders.
>
> Pete
>
----------------------------------------------------------------------------
----
> /*
> a system for self-reseeding randomness in povray. This enables a
povray
> file have a different random number seed each time it is run.
>
> To use, simply include this file, then call "get_seed()" once. Then
use
> rseed as your seed troughout your render. The last atatement in your
.pov
> file should be a call to "update_seed()".
>
> The random seed will be stored in "randseed.pov"
> */
>
>
> #macro get_seed()
> #if (file_exists("randseed.pov") = 1)
> #include "randseed.pov"
> // what if the file was bad or incomplete?
> #ifndef (rseed) // was this defined?
> // no. It was not. Fake it and hope better for next time around
> #render "bad randseed.pov file ... making a new one\n")
> #declare rseed = seed(83963179);
> #end
> #else
> // The file was not found. Fake it and hope better for next time
around
> #render "no randseed.pov file found ... making a new one\n")
> #declare rseed = seed(74747285);
> #end
> #ifndef (rseed)
> #render "\nWTF! rseed STILL not defined! That's impossible!!\n"
> #render "\g YOU HAVE A PROBLEM!!!!!\n"
> #end
> #end
>
>
> // update the random seed now that we are done with it.
> #macro update_seed()
> #ifdef (rseed)
> #local new_seed = 99999999 * rand(rseed);
> #local new_seed = int(new_seed);
> #fopen F1 "randseed.pov" write
> #write (F1, "#declare rseed = seed(", str(new_seed, 0, 0), ");\n")
> #write (F1, "#render \"Seed used is: seed(", str(new_seed, 0, 0), ")
\"\n")
> #write (F1, "#render \"\"\n")
> #fclose F1
> #end
> #end
>
>
> /* actual end of this_file */
>
Post a reply to this message
|
|
|
|
>Sorry, not quite sure how to apply this. Could you throw in a demo scene
>file using the random value for, say, the r value in an rgb vector?
>thanks much,
>D.
Sure. Render the attached file three or four times
and you'll see what I mean ... :)
Post a reply to this message
Attachments:
Download 'sure.pov.txt' (62 KB)
|
|
