void keyPressed() {
          if(key == CODED) { 
                      if (keyCode == UP) { 
                                 filltosee();
                                 } 
          else if (keyCode == DOWN) { 
                                 //fillnsave();
                                  nextslice();
          }
          
          
         // if (key == r) {
            
            //changelayercolor(200, 20, 40);
         // }                        
          
          }
}