code: function drawFX(renderer) {
           // fading effect
           if (this._fadeIn.tween) {
             renderer.clearColor(this._fadeIn.color); // remove the tween if over
  
             if (this._fadeIn.color.alpha === 1.0) {
               this._fadeIn.tween = null;
               me.pool.push(this._fadeIn.color);
               this._fadeIn.color = null;
             }
           } // flashing effect
  
  
           if (this._fadeOut.tween) {
             renderer.clearColor(this._fadeOut.color); // remove the tween if over
  
             if (this._fadeOut.color.alpha === 0.0) {
               this._fadeOut.tween = null;
               me.pool.push(this._fadeOut.color);
               this._fadeOut.color = null;
             }
           }
         }
docs: render the camera effects
  @ignore