  Image() : as_is(false) {
    bufferView = -1;
    width = -1;
    height = -1;
    component = -1;
    bits = -1;
    pixel_type = -1;
  }
  Image() : as_is(false) {
    bufferView = -1;
    width = -1;
    height = -1;
    component = -1;
    bits = -1;
    pixel_type = -1;
  }