Quader in Box - OpenProcessing

mySketch
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int n=20;
float h = 20.0;
​
int [][] c = new int[n][n];
​
float [][] p = new  float[n][n];
float [][] pn = new float[n][n];
float [][] pd = new float[n][n];
​
void setup(){
  size(800,800,WEBGL);
  colorMode(HSB,360,100,100);
  //noFill();
  frameRate(40);
  
  for(int i=0; i<n; i++){
    for(int j=0; j<n; j++){
      c[i][j]=int(random(360));
      p[i][j]=int(random(1,n+1));
      do{
      pn[i][j]=int(random(1,n+1));
      } while(pn[i][j]==p[i][j]);
      pd[i][j] = -0.1;
      if(pn[i][j]>p[i][j]) pd[i][j]=0.1;
    }
  }
}
​
void draw(){
  background(20);
  translate(width/2,height/2);
  //float x = map(mouseX,0,width,0,TWO_PI);
  //float y = map(mouseY,0,height,0,TWO_PI);
  rotateX(PI/4);
  rotateZ(PI/200*frameCount);
  rotateY(PI/6*sin(PI/250*frameCount));
  
  strokeWeight(1);
  stroke(220);
  noFill();
  
  box(h*n);
  
  
  for(int i=0; i<n; i++){
    for(int j=0; j<n; j++){
        pushMatrix();
        translate(h/2-h/2*n+i*h,h/2-h/2*n+j*h,-h/2*n);
        //color cl = color(c[i][j],100,100);
        quader(p[i][j]*h,h,c[i][j]);
        popMatrix();
        p[i][j]+=pd[i][j];
        if(abs(p[i][j]-pn[i][j])<0.01){
          do{
           pn[i][j]=int(random(1,n+1));
          }while(abs(pn[i][j]-p[i][j])<0.01);
           pd[i][j] = -0.1;
           if(pn[i][j]>p[i][j]) pd[i][j]=0.1;
        }
          
    }
  }
}
​
void quader(float l, float b,color cc){
  pushMatrix();
  translate(-b/2,-b/2,l);
  fill(cc,100,100);
  rect(0,0,b,b);
  popMatrix();
  strokeWeight(1);
  stroke(cc,60,30);
  noFill();
  //fill(cc,30,30,30);
  
  rotateX(PI/2);
  for(int i=0; i<4; i++){
    pushMatrix();
    rotateY(PI/2*i);
    //rotateX(PI/2);
    translate(-b/2,0,-b/2);
    rect(0,0,b,l);
    
    popMatrix();
  }
}