class Particle3D{
  Vec3D pos;
  Vec3D vel;
    Vec3D initPos;
  Vec3D initVel;
  color c;
  int age;
  
  Particle3D(Vec3D pos, Vec3D vel){
    this.pos = new Vec3D(pos);
    this.vel = new Vec3D(vel); 
    this.initPos = new Vec3D(pos);
    this.initVel = new Vec3D(vel); 
    age=(int)random(820);
    }
    
   Particle3D(Particle3D p){
    this.pos = new Vec3D(p.pos);
    this.vel = new Vec3D(p.vel); 
       this.initPos = new Vec3D(p.pos);
    this.initVel = new Vec3D(p.vel); 
    this.age = p.age;
    }
  
  void update(Vec3D force){
    vel=vel.add(force);
    pos=pos.add(vel);
    
    }
    
   void reset(){
     pos = new Vec3D(initPos);
     vel = new Vec3D(initVel);
    age=(int)random(820);;

     
     
     }
  
  
  }