在放大时处理调整大小的形状

Question

我在放大时无法重新调整球体的大小，以便随着盒子一起变小，并且随着盒子变小，碰撞边界也会调整大小。我究竟做错了什么？这是我的代码：

float rotX, rotY;
float zoom = 1;
float angle = 0;
float bounds = 500;
int amount = 8000;
MovingSphere s;
int[] x = new int[amount];
int[] y = new int[amount];
int[] z = new int[amount];

void setup() {
  size(900, 900, P3D);
  background(0);
  noFill();
  stroke(255);
  strokeWeight(1);
  s = new MovingSphere();
  for(int i = 0; i<amount; i++) {
    x[i] = int(random(-250, 250));
    y[i] = int(random(-250, 250));
    z[i] = int(random(-250, 250));
  }
}
void draw() {
  background(0);
  translate(width/2, height/2);
  lights();
  pushMatrix();
  //translations();
  //scale (zoom);
  //rotate (angle);
  s.collisions();
  s.location();
  s.display();
  popMatrix();
  translations();
  scale (zoom);
  rotate (angle);
  //s.collisions();
  //s.location();
  //s.display();
  box(bounds);
  for(int i = 0; i<amount; i++) {
    point(x[i], y[i], z[i]);
  }
}

void mouseDragged(){
  float x1 = mouseX-pmouseX;
  float y1 = mouseY-pmouseY;
  rotX += -y1 * 0.01;
  rotY += x1 * 0.01;

}

void translations() {
  rotateX(rotX);
  rotateY(rotY);
}

void mouseWheel(MouseEvent event){
  float e = event.getCount();
  zoom += e *.01;
  println(e);
}

第二档：

float xpos = 200;
float ypos = 50;

float gravity = 0.98;
float bounce = -1;

class MovingSphere {
 PVector position;
 PVector velocity;
 MovingSphere(){
   position = new PVector(0, 0, 0);
   velocity = new PVector(2.5, 5, 7.5);
   //vy = new PVector(0, 0, 0);

   }

   void location() {
     position.add(velocity);

     translate(position.x, position.y, position.z);
   }
   void collisions(){
     if (position.x > bounds/2.7 || position.x < -bounds/2.7) {
       velocity.x*=-1;
     }
     if (position.y > bounds/2.7 || position.y < -bounds/2.7) {
       velocity.y*=-1;
     }
     if (position.z > bounds/2.7 || position.z < -bounds/2.7) {
       velocity.z*=-1;
     }
   }

  void display() {
    //stroke(255);
    //fill(50, 70, 230);
    sphere(30);
  }
}