+ scenes/my_dataset/
  - dataset.ini [required]
        Copy this from a sample scene and update the pathes.
  - Camera files [required]
        For each camera one ini file. Checkout sample scenes.
        If all images are captured by the same camera, only one camera file is required!
        camera0.ini
        camera1.ini
        ... 
  - point_cloud.ply [required]
        positions, normals
  - images.txt      [required]
        0000.jpg
        0001.jpg
        ...
  - camera_indices.txt [required]
        For each image the corresponding camera. Example:
        0
        0
        1
        0
        ... 
  - masks.txt [optional]
        0000.png
        0001.png
        ...
  - poses.txt [required]
        Camera -> World Transformation
        qx qy qz qw tx ty tz
   - exposure.txt [optional]
        Initialization of the Exposure Value (EV). For example from the jpg EXIF data.
        13.1
        14
        10.5
        ...