Hi, Im taking a look at the cloud example of physics library. I ave two problems:

 

http://murderandcreate.com/physics/cloud/index.html

 

1. I dont have the fade.png file, I dont know how it is.

 

2. I've taken a look to the code and I see that it is a particle that atracts other ones than appears in a random way throught the windows. I´ve modified the code to represent the particles as a point instead of using the fade.png. The particles appears at the beginning and all dissapear quickly. I´ve changed the atraction constant and they dissapear slowly, but they don't move. I vave no idea of why this is happening.

This is the modified code:

import traer.physics.*;

Particle mouse;
Particle[] others;
ParticleSystem physics;

//PImage img;

void setup()
{
  size( 400, 400 );
  frameRate( 24 );
  cursor( CROSS );
 
  //img = loadImage( "fade.png" );
  //imageMode( CORNER );
  //tint( 0, 32 );
 
  physics = new ParticleSystem( 0, 0.1 );
  mouse = physics.makeParticle();
  mouse.makeFixed();
 
  others = new Particle[1000];
  for ( int i = 0; i < others.length; i++ )
  {
    others[i] = physics.makeParticle( 1.0, random( 0, width ), random( 0, height ), 0 );
    physics.makeAttraction( mouse, others[i], 5, 50 );
  }
}

void draw()
{
  mouse.position().set( mouseX, mouseY, 0 );
 
  physics.tick();

  background(0 );
 
  for ( int i = 0; i < others.length; i++ )
  {
     Particle p = others[i];
     set( int(p.position().x()),int(p.position().y()),100 );
  }
}