[doc] COLMAP Arborescence

docs/colmap_arborescence.md

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+# COLMAP Arborescence
+
+## After COLMAP as been run
+
+If your project is called `my_project` and is stored in `/path/to/my_project`
+then if you were to look at the `tree` inside `/path/to/my_projet` after COLMAP
+has been run you should see something like.
+
++── images
+│   +── image1.jpg
+│   +── image2.jpg
+│   +── ...
++── sparse
+│   +── 0
+│   │   +── cameras.bin
+│   │   +── images.bin
+│   │   +── points3D.bin
+│   +── ...
++── dense
+│   +── 0
+│   │   +── images
+│   │   +── sparse
+│   │   +── stereo
+│   │   +── fused.ply
+│   │   +── meshed-poisson.ply
+│   │   +── meshed-delaunay.ply
+│   +── ...
++── database.db
+
+If you want to learn more about the arborescence of a COLMAP project please
+refeer to the official COLMAP documentation at htps://colmap.github.io
+
+## Before COLMAP has been run
+
+If you are starting from scratch you should only need the `images` subfolder.
+The argument `basedir` in the different functions in the COLMAP wrapper refers
+to the project directory and not to the image directory.
+
+```python
+from nerf_homemade.poses.pose_utils import gen_poses
+gen_poses('/path/to/my_projet')
+```