3Dのブロックを積み上げる

/**
* stack of blocks 
*
* @author aa_debdeb
* @date 2016/04/28
*/

int[][] blocks;
int num = 50;
int bsize = 10;

void setup(){
  size(500, 500, P3D);
  blocks = new int[num][num];
  for(int x = 0; x < num; x++){
    for(int y = 0; y < num; y++){
      blocks[x][y] = 0;
    }
  }
  stroke(0);
  fill(255);
}

void draw(){
  background(255);
  lights();
  translate(width / 2, height / 2, -200);
  rotateX(PI / 3);
  rotateZ(PI / 4);
  for(int x = 0; x < num; x++){
    for(int y = 0; y < num; y++){
      for(int z = 0; z < blocks[x][y]; z++){
        pushMatrix();
        translate(x * bsize - width / 2, y * bsize - height / 2, z * bsize);
        box(bsize);
        popMatrix();
      }
    }
  }
  blocks[int(random(num))][int(random(num))] += 1;
}