 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Hello,
I use "f_noise_generator" in the function définition of an isosurface.
I generate several isosurfaces in loops.
Does "f_noise_generator(x,y,z,g)" always return the same value or not?
--
Kurtz le pirate
Compagnie de la Banquise
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
kurtz le pirate <kur### [at] gmail com> wrote:
> Hello,
>
> I generate several isosurfaces in loops.
>
>
> Does "f_noise_generator(x,y,z,g)" always return the same value or not?
It should, unless it somehow gets changed mid-scene.
Noise Generators
There are three noise generators implemented. Changing the noise_generator will
change the appearance of noise based patterns, like bozo and granite.
noise_generator 1 the noise that was used in POV_Ray 3.1
noise_generator 2 range corrected version of the old noise, it does not show the
plateaus seen with noise_generator 1
noise_generator 3 generates Perlin noise
The default is noise_generator 2
Note: The noise_generator can also be set in global_settings
https://wiki.povray.org/content/Reference:Pattern_Modifiers#Noise_Generators
Noise_generator
There are three noise generators implemented.
noise_generator 1 the noise that was used in POV_Ray 3.1
noise_generator 2 'range corrected' version of the old noise, it does not show
the plateaus seen with noise_generator 1
noise_generator 3 generates Perlin noise
The default is noise_generator 2
Note: The noise_generators can also be used within the pigment/normal/etc.
statement.
https://wiki.povray.org/content/Reference:Global_Settings#Noise_generator
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 5/14/21 6:17 AM, kurtz le pirate wrote:
>
> Hello,
>
> I use "f_noise_generator" in the function définition of an isosurface.
> I generate several isosurfaces in loops.
>
> Does "f_noise_generator(x,y,z,g)" always return the same value or not?
>
If all the arguments are the same, it should return the same value - to
16 significant digits.
Bill P.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Thanks guys. That's what I thought :(
Bad news for me. I need to find a way to make the appearance of the
isosurface more random.
Changing the generator in the loop does not change the appearance enough.
--
Kurtz le pirate
Compagnie de la Banquise
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Le 2021-05-14 à 09:07, kurtz le pirate a écrit :
>
> Thanks guys. That's what I thought :(
>
> Bad news for me. I need to find a way to make the appearance of the
> isosurface more random.
>
> Changing the generator in the loop does not change the appearance enough.
>
>
Easy.
Add :
#declare R = seed(0);
then, do this :
#local RX = rand(R)*100;
#local RY = rand(R)*100;
#local RZ = rand(R)*100;
Then, change your calls as follow :
f_noise_generator(x+RX,y+RY,z+RZ,g)
That way, the samplings for the function are jittered around, resulting
in different objects.
Instead of using a random value, you could also use the intended
displacement of the isosurface as an offset.
f_noise_generator(x+Location.x,y+Location.y,z+Location.z,g)
This will have an effect similar to applying a pattern to an union as a
whole.
Then, in some cases, adding some random rotation can work great to make
identical irregular objects look different.
Add
rotate<rand(R),rand(R),rand(R)>*360
before translating your objects to their final location.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
|
|
