3D photo stuff - OpenProcessing

mySketch
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PImage img, dimg, img1, img2, dimg1, dimg2;
​
float dMult = 0.25;
float pixy = 5;
String shape = "box";
​
void setup() {
  size(750, 750, P3D);
  background(50);
  textSize(64);
  textAlign(CENTER, CENTER);
  img1 = loadImage("chrom.jpg");
  dimg1 = loadImage("chrom-depthmap.jpg");
  img2 = loadImage("Mango.jpg");
  dimg2 = loadImage("Mango-depthmap.jpg");
  
  img = img1;
  dimg = dimg1;
}
​
void draw() {
  background(50);
  
  noStroke();
  fill(255);
  
  if (img.width == 0 || dimg.width == 0) {
    text("Loading...", 250, 375);
    return;
  }
  
  camera(mouseX, mouseY, 500 + constrain(dMult * 200, 50, dMult * 200 + 1), width / 2, height / 2, 0, 0, 1, 0);
  
  for (int y = 0; y < img.height; y += pixy) {
    for (int x = 0; x < img.width; x += pixy) {
      int loc = x + y * img.width;
      
      color pixC = img.pixels[loc];
      
      if (keyPressed) {
      if (key == ' ') {
        pixC = dimg.pixels[loc];
      }
    }
​
      float zB = 255 - brightness(dimg.pixels[loc]);
​
      tile nT = new tile((x / 1.5) + 250, (y / 1.5) + 255, zB, pixC);
      nT.render(dMult);
    }
  }
  
  lights();
  
  if (keyPressed) {
    if (key == 'q' || key == 'Q') {
      dMult += 0.01;
    }
    if (key == 'e' || key == 'E') {
      dMult -= 0.01;
    }
    if (keyCode == RIGHT) {
      pixy++;
    }
    if (keyCode == LEFT) {
      pixy--;
      if (pixy < 5)
        pixy = 5;
    }
  }
  
}
​
void keyPressed() {
  if (key == '1') {
    img = img1;
    dimg = dimg1;
  }
  if (key == '2') {
    img = img2;
    dimg = dimg2;
  }
  if (key == 'b') {
    shape = "box";
  } else if (key == 's') {
    shape = "sphere";
  } else if (key == 'r') {
    shape = "rect";
  }
}
​
class tile {
  int x, y, z;
  color pixC;
​
  tile(int nX, nY, nZ, color nC) {
    x = nX;
    y = nY;
    z = nZ;
    pixC = nC;
  }
​
  void render(float dph) {
    pushMatrix();
​
    translate(x, y, (z * dph));
    fill(pixC);
    switch (shape) {
      case "box":
        box(pixy * .7);
        break;
      case "sphere":
        sphere(pixy * .7);
        break;
      case "rect":
        rect(0, 0, pixy * .7, pixy * .7);
        break;
    }
​
    popMatrix();
  }
}