How to increase our camera in processing?

susabgp

I'm trying to keep the balls in the screen but they they keep disapearinvg in the z axis. I dont know if i'm doing anything wrong with the forces, or if there's any way i could manipulate the camera caracters, to make it bigger. The Z axis seems to be very "short".

Here's what i've got so far:

Ball[] balls;
int numBalls = 0;
Ball b;
boolean isPressed = false;

void setup() {
  size (800, 800, P3D);
  smooth();
  //camera(width/2.0, height/2.0, (height/2.0) / tan(PI*30.0 / 180.0), width/2.0, height/2.0, 0, 0, 1, 0);
  background (0);
  balls = new Ball[300];
}

void draw (){
  noStroke();
  fill (0);
  rect(0, 0, width, height);
  if (mousePressed){

    //println(isPressed, numBalls);
    if(isPressed == false && numBalls < 300){
      println("cria bola");
      b = new Ball(mouseX, mouseY, 200.0);
      balls[numBalls] = b;
      numBalls++;
      isPressed = true;
    }

  }else{
   isPressed = false; 
  }
  println("NUMBALLS:", numBalls);
  for( int i = 0; i<numBalls; i++){
    //println(">", i,  balls[i]);
     balls[i].update();
  }

 for( int i = 0; i<numBalls; i++){
     balls[i].draw();
  }


}


public class Ball {

  PVector location;
  PVector velocity;
  PVector acceleration;
  PVector gravity;
  PVector lance;
  float friction ;
  int depth;


  Ball(float x, float y, float z) {

    location = new PVector (x, y, z);
    lance = new PVector (0, -20, -15);
    velocity = new PVector(0, 0, 0);
    //println("created:", location.x, location.y);
  }
  void update(){
    //println(location.x,location.y,location.z, this);
    velocity.add(lance);
    lance = new PVector(0, 0, 0);

    if ((location.z < 10)) {
    friction = 0.76;
    gravity = new PVector(0, 0, 0);
    } else {
    friction = 1.0;
    gravity = new PVector(0, 0.98, 0);
    }


    depth = 800;
    smooth();
    //gravity = new PVector(0, 0.98, 0);
    //location = new PVector(width/2, height/2, -3000);
    //velocity = new PVector(0, 10, -20);
    //lance = new PVector(0, 0, 0);
    //friction = 1.0; //0.98;  

    velocity.add(gravity);
    velocity.mult(friction);
    location.add(velocity);

  }
  void draw(){
    pushMatrix();
    //println("draw", this);
    noStroke();
    fill(255);
    lights();
    translate(location.x, location.y, location.z);
    sphere(35);
    popMatrix();
  }
}

(I' want to make something like this picture, by making random forces in the lances. )

Thank you so much