void keyPressed() {
          if(key == CODED) { 
                      if (keyCode == UP) { 
                                 nextslice();
                                 } 
                      else if (keyCode == DOWN) { 
                                 prevslice();
                      }
                      else if (keyCode == SHIFT) {
                                 nextlayer();
                      }
                      else if (keyCode == CONTROL) {
                                 prevlayer();
                      }
          }
         
         if (key == 'r' || key == 'R') {
                         frostingcolororoff=1;
                         println("red");
                       }
         else if (key == 'g' || key == 'G') {//changes renderbox color to green
                         frostingcolororoff= 2;
                       }
         else if (key == 'b' || key == 'B') {//changes renderbox color to blue
                         frostingcolororoff= 3;
                       }
         else if (key == 'e' || key == 'E') {//erases- sets frosting back to 0 and redraws stage color.
                         frostingcolororoff= 0;
                         }     
            
          }


void nextslice() {
   zoff -= 8;
   } 
   
void prevslice() {
  zoff += 8;
}

void nextlayer() {
  layerheight -= 20;
}

void prevlayer() {
  layerheight += 20;
}