// Mouse horizontal location controls breaking apart of image and 
 // Maps pixels from a 2D image into 3D space. Pixel brightness controls 
 // translation along z axis. 
 
 
PImage img;       // This is the source image
int cellsize = 2; // This is the dimentions of the cells in each grid
int COLS, ROWS;   // This means the number of columns and rows in grid
void setup()
{
  size(400, 400, P3D); // Make sure the image pixel is the same as size pixel
  img = loadImage("earth.jpg");     // This is a way to load image from 
  COLS = width/cellsize;            // Calculates the # of columns
  ROWS = height/cellsize;           // Calculates the # of rows
  colorMode(RGB,255,255,255,100);   // This sets the colormode
}
void draw()
{
  background(0);
  // Begin loop for columns
  for ( int i = 0; i < COLS;i++) {
    // Begin loop for rows
    for ( int j = 0; j < ROWS;j++) {
      int x = i*cellsize + cellsize/2; // x position
      int y = j*cellsize + cellsize/2; // y position
      int loc = x + y*width;           // This is the pixel array location
      color c = img.pixels[loc];       // Grabs the color
      // Calculates a z position as a function of mouseX and pixel brightness
      float z = (mouseX / (float) width) * brightness(img.pixels[loc]) - 100.0f;
      // Translate to the location, sets fill and stroke, and draw the rect
      pushMatrix(); // Pushes the current transformation matrix onto the matrix stack
      translate(x,y,z); // Specifies an amount to displace objects within the display window
      fill(c); // Sets the color used to fill shapes
      noStroke(); // Disables drawing the stroke (outline). If both noStroke() and noFill() are called, nothing will be drawn to the screen.
      rectMode(CENTER);// Modifies the location from which rectangles draw (in this case, it is the CINTER)
      rect(0,0,cellsize,cellsize); // Draws a rectangle to the screen. A rectangle is a four-sided shape with every angle at ninety degrees. The first two parameters set the location, the third sets the width, and the fourth sets the height. The origin is changed with the rectMode() function.
      popMatrix(); // Pops the current transformation matrix off the matrix stack
    }
  }
}