Nathan Kopp wrote:
> 
> [...]
> 
> The other functions probably shouldn't be "re-tweaked" because it appears
> there is no tweaking in the current implementation and they are expecting
> plateau-free noise (which is produced by noise generators 2 and 3).
> 
> Re-tweaking is easy.  It is done by taking the output from the new Noise
> function, multiplying by 2 and subtracting 0.5.  Then clipping (to the
> interval [0,1]) is done if necessary.  I applied this method to granite to
> produce the attached results.
> 
> Attached is an image of the re-tweaked granite rendered using the three
> noise generators.  Note that noise_generator 1 has not changed and produces
> the old 3.1-style output perfectly.  It is interesting to note the clear
> patterns that emerge from noise_generator 3.  This seems to confirm some
> reports that noise_generator 3 doesn't seem to be very random.
> 

I made a another test image with various patterns involved:

http://www.schunter.etc.tu-bs.de/~chris/files/noise_generator_A.png

The structures in granite with noise_generator 3 are really quite obvious,
In the other patterns they seem to be at least less clearly visible.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

Post a reply to this message