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Summary:
Copypasting the docstring:
```
Split a mesh into submeshes, defined by face indices of the original Meshes object.
Args:
face_indices:
Let the original mesh have verts_list() of length N.
Can be either
- List of length N. The n-th element is a list of length num_submeshes_n
(empty lists are allowed). Each element of the n-th sublist is a LongTensor
of length num_faces.
- List of length N. The n-th element is a possibly empty padded LongTensor of
shape (num_submeshes_n, max_num_faces).
Returns:
Meshes object with selected submeshes. The submesh tensors are cloned.
Currently submeshing only works with no textures or with the TexturesVertex texture.
Example:
Take a Meshes object `cubes` with 4 meshes, each a translated cube. Then:
* len(cubes) is 4, len(cubes.verts_list()) is 4, len(cubes.faces_list()) is 4,
* [cube_verts.size for cube_verts in cubes.verts_list()] is [8, 8, 8, 8],
* [cube_faces.size for cube_faces in cubes.faces_list()] if [6, 6, 6, 6],
Now let front_facet, top_and_bottom, all_facets be LongTensors of
sizes (2), (4), and (12), each picking up a number of facets of a cube by specifying
the appropriate triangular faces.
Then let `subcubes = cubes.submeshes([[front_facet, top_and_bottom], [], [all_facets], []])`.
* len(subcubes) is 3.
* subcubes[0] is the front facet of the cube contained in cubes[0].
* subcubes[1] is a mesh containing the (disconnected) top and bottom facets of cubes[0].
* subcubes[2] is a clone of cubes[2].
* There are no submeshes of cubes[1] and cubes[3] in subcubes.
* subcubes[0] and subcubes[1] are not watertight. subcubes[2] is.
```
Reviewed By: bottler
Differential Revision: D35440657
fbshipit-source-id: 8a6d2d300ce226b5b9eb440688528b5e795195a1