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Index › Programming Questions & Help › Syntax Questions › Using noise with PVector
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Using noise with PVector (Read 797 times)
nerdwerk
Using noise with PVector
Sep 22nd, 2009, 6:20am  
Hello guys, i would like to have your time and ask a question..

I had this Particle class with loc,vel,acc using PVector, and i want to give acc some noise value, i want my particles to accelerate in a flow field, moving randomly, i could give acc a random() value but i want to do it with perlin noise so...

theres an applyForce() function in the class which is like

void applyForce(PVector force)
{
   force.div(mass);
   acc.add(force);
}


but since the force is PVector and noise is float, i just couldnt figure out what to do, it's been a day soi would love to hear your reccomendations..

thanks for your time,
Metin
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antiplastik
Re: Using noise with PVector
Reply #1 - Sep 22nd, 2009, 1:51pm  
Look at the reference:
http://processing.org/reference/PVector_mult_.html

Maybe you could use something like
Code:
acc.add(PVector.mult(force, noise()));
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nerdwerk
Re: Using noise with PVector
Reply #2 - Sep 22nd, 2009, 3:20pm  
indeed, but i still dont know what to put in noise() method to create a noise flow-field, i dont want it to move random Sad
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antiplastik
Re: Using noise with PVector
Reply #3 - Sep 23rd, 2009, 9:00am  
As seen in the reference, noise() takes a float as argument. Increase this float on each frame to get a smooth noise curve :

Code:
float p = 0.0;
void draw() {
  p += 0.01;
  acc.add(PVector.mult(force, noise(p)));
}
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