code: function (oldData) {
  
      this.position_control_from_camera();
  
      this.bar.setAttribute("height", this.data.size/4.0);
      this.bar.setAttribute("width", this.data.size);
      this.bar.setAttribute("position", "0.0 0.0 0");
  
  
      this.play_image.setAttribute("height", this.data.size/4.0);
      this.play_image.setAttribute("width", this.data.size/4.0);
      this.play_image.setAttribute("position", ((-this.data.size/2.0) * 1.4) + " 0 0");
  
  
    }
docs: Called when component is attached and when component data changes.
  Generally modifies the entity based on the data.