/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.QBLT86RGjNk/rev.2
 * 
 * authors: 
 *   (Unnamed author)

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



// This sketch builds on a prior work, "Untitled Sketch", created by [unnamed author]
// http://sketchpad.cc/sp/pad/view/ro.sFnIz4N1oDD/rev.204



// Pressing Control-R will render this sketch.

float increment = 0.01;  
// The noise function's 3rd argument, a global variable that increments once per cycle  
float zoff = 0.0;    
// We will increment zoff differently than xoff and yoff  
float zincrement = 0.02;   
  
void setup() {  
  size(200,200);  
  frameRate(30);  
}  
  
void draw() {  
  background(0);  
    
  // Optional: adjust noise detail here  
  // noiseDetail(8,0.65f);  
    
  loadPixels();  
  
  float xoff = 0.0; // Start xoff at 0  
    
  // For every x,y coordinate in a 2D space, calculate a noise value and produce a brightness value  
  for (int x = 0; x < width; x++) {  
    xoff += increment;   // Increment xoff   
    float yoff = 0.0f;   // For every xoff, start yoff at 0  
    for (int y = 0; y < height; y++) {  
      yoff += increment; // Increment yoff  
        
      // Calculate noise and scale by 255  
      float bright = noise(xoff,yoff,zoff)*255;  
  
      // Try using this line instead  
      //float bright = random(0,255);  
        
      // Set each pixel onscreen to a grayscale value  
      pixels[x+y*width] = color(bright,bright,bright);  
    }  
  }  
  updatePixels();  
    
  zoff += zincrement; // Increment zoff  
    
    
}