old_contents: 
  import extract_metadata
  import detect_features
  import match_features
  import create_tracks
  import reconstruct
  import mesh
  import undistort
  import compute_depthmaps
  import export_ply
  import export_openmvs
  
  opensfm_commands = [
      extract_metadata,
      detect_features,
      match_features,
      create_tracks,
      reconstruct,
      mesh,
      undistort,
      compute_depthmaps,
      export_ply,
      export_openmvs,
  ]
  
new_contents: 
  import extract_metadata
  import detect_features
  import match_features
  import create_tracks
  import reconstruct
  import mesh
  import undistort
  import compute_depthmaps
  import export_ply
  import export_openmvs
  import export_visualsfm
  
  opensfm_commands = [
      extract_metadata,
      detect_features,
      match_features,
      create_tracks,
      reconstruct,
      mesh,
      undistort,
      compute_depthmaps,
      export_ply,
      export_openmvs,
      export_visualsfm,
  ]
  
subject: Add exporter to VisualSfM format