import processing.video.*;
  
  Capture video;
  int videoCount;
  int currentAngle;
  int pixelCount;
  int angleCount = 200;  // how many divisions
  
  int radii[];
  int angles[];
  
  void setup() {
    // size must be set to video.width*video.height*2 in both directions
    size(960, 540); 
  
    // Uses the default video input, see the reference if this causes an error
    video = new Capture(this, 24, 16);
    videoCount = video.width * video.height;
  
    pixelCount = width*height;
    int centerX = width / 2;
    int centerY = height / 2;
    radii = new int[pixelCount];
    angles = new int[pixelCount];
  
    int offset = 0;
    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        int dx = centerX - x;
        int dy = centerY - y;
  
        float angle = atan2(dy, dx);
        if (angle < 0) angle += TWO_PI;
        angles[offset] = (int) (angleCount * (angle / TWO_PI));
  
        int radius = (int) mag(dx, dy);
        if (radius >= videoCount) {
          radius = -1;
          angles[offset] = -1;
        }
        radii[offset] = radius;
        
        offset++;
      }
    }
    background(0);
  }
  
  void draw() {
    if (video.available()) {
      video.read();
      video.loadPixels();
    
      loadPixels();
      for (int i = 0; i < pixelCount; i++) {
        if (angles[i] == currentAngle) {
          pixels[i] = video.pixels[radii[i]];
        }
      }
      updatePixels();
      
      currentAngle++;
      if (currentAngle == angleCount) currentAngle = 0;
    }
  }