Fix ShapeNetDataset (#593)

Summary:
- Add MANIFEST.in and `include_package_data=True` to include dataset .json files in the installation
Fix https://github.com/facebookresearch/pytorch3d/issues/435
- Fix `load_textures=False` for ShapeNetDataset with a test
Fix https://github.com/facebookresearch/pytorch3d/issues/450, partly fix https://github.com/facebookresearch/pytorch3d/issues/444. I've set the textures to `None`, if they should be all white instead, let me know.

Pull Request resolved: https://github.com/facebookresearch/pytorch3d/pull/593

Reviewed By: patricklabatut

Differential Revision: D29116264

Pulled By: nikhilaravi

fbshipit-source-id: 1fb0198e616b7f834dfeaf7168bb5e6e530810d1

MANIFEST.in

+include pytorch3d/datasets/shapenet/shapenet_synset_dict_v1.json
+include pytorch3d/datasets/shapenet/shapenet_synset_dict_v2.json
+include pytorch3d/datasets/r2n2/r2n2_synset_dict.json

pytorch3d/datasets/shapenet_base.py

@@ -96,6 +96,8 @@ class ShapeNetBase(torch.utils.data.Dataset):  # pragma: no cover
                     self.texture_resolution,
                     3,
                 )
+        else:
+            textures = None
 
         return verts, faces.verts_idx, textures
 

setup.py

@@ -142,4 +142,5 @@ setup(
     },
     ext_modules=get_extensions(),
     cmdclass={"build_ext": BuildExtension},
+    include_package_data=True,
 )

tests/test_shapenet_core.py

@@ -282,3 +282,10 @@ class TestShapenetCore(TestCaseMixin, unittest.TestCase):
                 "test_shapenet_core_render_without_sample_nums_%s.png" % idx, DATA_DIR
             )
             self.assertClose(mixed_rgb_2, image_ref, atol=0.05)
+
+    def test_load_textures_false(self):
+        shapenet_dataset = ShapeNetCore(
+            SHAPENET_PATH, load_textures=False, version=VERSION
+        )
+        model = shapenet_dataset[0]
+        self.assertIsNone(model["textures"])