scenes {
  name: "background_image"
  type: PHOTOSPHERE
  subrenderer_priority: 0
  trigger_groups {
    triggers {
      name: "a"
      trigger_type: ON_COMPOUND_SCENE_START
    }
    trigger_expression: "a"
    behaviors {
      behavior_type: START_SCENE
    }
    name: "start_scene"
  }
  pano_scene {
    image_file_name: "photosphere.jpg"
    is_mega_stereo: false
    is_tiled_image: false
  }
}