noise() Vs random()

blyk

Hi, I want to discuss on the implementation and application of noise() & random().

Like here in this example

float xoff = 1.0;
void setup(){
  size(200,200);

}
void draw() {
  background(-1);
  float n = noise(xoff) * width;
  line(n, 0, n, height);
}

noise() runs only once in the draw loop where as random as shown in below example

float xoff = 1.0;
void setup(){
  size(200,200);

}
void draw() {
  background(-1);
  float n = random(xoff) * width;
  line(n, 0, n, height);
}

runs and generate dfferent values in each frame but noise() doesn't, why ? please explain how to use noise(); and why it doesn't generate new value in each frame?

_vk

Can't really explain under the hood, but to use noise you need to increment it's parameter in draw():

float xoff = 1.0;
void setup(){
  size(200,200);

}
void draw() {
  background(-1);
  float n = noise(xoff) * width;
  line(n, 0, n, height);
  xoff+=0.01;//tweak here 
}

blyk

thanks _vk : On processing web referece they have mentioned that it generates random values better than random() function but problem is why doesn't it generate new value in each frame?

Also your tweak code is the exact code mentioned on processing reference. :)

_vk

Well this is a good place to look:

http://natureofcode.com/book/introduction/#i6-perlin-noise-a-smoother-approach

by Daniel Shiffman

And the man himself : )

http://www.noisemachine.com/talk1/index.html

by Ken Perlin