Noise in Circle

Programming Questions

bourdonpr..

in Programming Questions • 1 year ago

Hi to all.

I have the following code of a line that moves randomly (as an audio signal). I want to change this line to be in a circular configuration. How can I change the points of the line to a circle?

Any tips?

float time = 0;
void setup() {
size (500, 500);
}
void draw() {
fill(255, 20);
rect(0, 0, width, height);
background(255);
float x = 0;
while (x <width) {
point (x, height*noise(x/105, time));
x= x + 1;
}
time = time + 0.05;
}

Replies(6)

bourdonpr..

Re: Noise in Circle

1 year ago

Have also found a solution as this one, but I want it to have an organic motion...

What do you think?

bourdonpr..

Re: Noise in Circle

1 year ago

How can I transform the above code instead of a line to a circle?

Many thanks!

benja

Re: Noise in Circle

1 year ago

Is this what you were looking for?
https://forum.processing.org/topic/how-to-make-perlin-noise-loop

bourdonpr..

Re: Noise in Circle

1 year ago

Thanks for the suggestion. I had a look at the link, but it is not exactly what I want. Thus, I developed the following, but I have this problem that the first and last point do not align.

I looked also how the fixed this issue in this example, but I couldn't fix it.

Does anyone have a suggestion?

int num = 100;
float rot = TWO_PI/num;
float innerRadZero1 = 0;
float barrier = 0.9;
float time = 0;
void setup() {
size(700, 700);
smooth();
background(0);
stroke(255);
}
void draw() {
background(0);
translate(width/2, height/2);
strokeWeight(5);
for (float angle = 0; angle < 2*PI; angle += .01) {
float x1 = cos(angle)*100;
float y1 = sin(angle)*100;
float innerRad1 = noise(angle/2, time);
if (angle == 0) {
innerRadZero1 = innerRad1;
}
else if (angle>num*barrier) {
float perc = map(angle, num*barrier, num, 0, 1);
innerRad1 = lerp(innerRad1, innerRadZero1, perc);
}
point(x1 * innerRad1, y1 * innerRad1);
}
time = time + 0.05;
}

benja

Re: Noise in Circle

1 year ago

I think the last code from patakk in the thread i linked above is exactly what you want. If not, please explain in more detail what you want to achieve.

bourdonpr..

I have tried to take this example and fit it in my project, but I can't find how to control A) the amount of noise (i.e. to make the noise lesser or more if I want) and B) to stop it having this breathing-like behavior (the line of code that includes the sin).

In the example I posted earlier I have exactly what I want. I can control the noise amount, and also it doesn't do any other movements (like with sin before). However, the problem should be in the following part, as I have to map the range of values from one point to the other (when angle is 0, and when angle is more than num*barrier):

if (angle == 0) {
innerRadZero1 = innerRad1;
}
else if (angle>num*barrier) {
float perc = map(angle, num*barrier, num, 0, 1);
innerRad1 = lerp(innerRad1, innerRadZero1, perc);
}

But I can't seem to find the correct values to map and so to make the circle close at the other end. The other example uses a different method to do that, and I can't find how to do this on mine..................

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Noise in Circle

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