Test gltf texture without renderer.

Summary:
Change the cow gltf loading test to validate the texture values and not to validate the renderer output because it has an unstable pixel.

Also a couple of lints.

Reviewed By: patricklabatut

Differential Revision: D29131260

fbshipit-source-id: 5e11f066a2a638588aacb09776cc842173ef669f

pytorch3d/renderer/blending.py

@@ -6,6 +6,7 @@ from typing import NamedTuple, Sequence, Union
 import torch
 from pytorch3d import _C  # pyre-fixme[21]: Could not find name `_C` in `pytorch3d`.
 
+
 # Example functions for blending the top K colors per pixel using the outputs
 # from rasterization.
 # NOTE: All blending function should return an RGBA image per batch element

pytorch3d/renderer/mesh/rasterize_meshes.py

@@ -401,7 +401,7 @@ def pix_to_non_square_ndc(i, S1, S2):
     return -offset + (ndc_range * i + offset) / S1
 
 
-def rasterize_meshes_python(
+def rasterize_meshes_python(  # noqa: C901
     meshes,
     image_size: Union[int, Tuple[int, int]] = 256,
     blur_radius: float = 0.0,

tests/test_io_gltf.py

@@ -143,14 +143,26 @@ class TestMeshGltfIO(TestCaseMixin, unittest.TestCase):
             mesh_obj.get_bounding_boxes().cpu(), mesh_obj.get_bounding_boxes()
         )
 
+        self.assertClose(
+            mesh.textures.verts_uvs_padded().cpu(), mesh_obj.textures.verts_uvs_padded()
+        )
+
+        self.assertClose(
+            mesh.textures.faces_uvs_padded().cpu(), mesh_obj.textures.faces_uvs_padded()
+        )
+
+        self.assertClose(
+            mesh.textures.maps_padded().cpu(), mesh_obj.textures.maps_padded()
+        )
+
         if DEBUG:
             texturesuv_image_PIL(mesh.textures).save(DATA_DIR / "out_cow.png")
-        image = _render(mesh, "cow", azim=4)
 
-        with Image.open(DATA_DIR / "glb_cow.png") as f:
+            image = _render(mesh, "cow", azim=4)
-            expected = np.array(f)
+            with Image.open(DATA_DIR / "glb_cow.png") as f:
+                expected = np.array(f)
 
-        self.assertClose(image, expected)
+            self.assertClose(image, expected)
 
     def test_load_cow_no_texture(self):
         """

tests/test_render_meshes_clipped.py

@@ -17,8 +17,8 @@ from common_testing import TestCaseMixin, get_tests_dir, load_rgb_image
 from pytorch3d.io import save_obj
 from pytorch3d.renderer.cameras import (
     FoVPerspectiveCameras,
-    look_at_view_transform,
     PerspectiveCameras,
+    look_at_view_transform,
 )
 from pytorch3d.renderer.lighting import PointLights
 from pytorch3d.renderer.mesh import (
@@ -35,6 +35,7 @@ from pytorch3d.renderer.mesh.textures import TexturesVertex
 from pytorch3d.structures.meshes import Meshes
 from pytorch3d.utils import torus
 
+
 # If DEBUG=True, save out images generated in the tests for debugging.
 # All saved images have prefix DEBUG_
 DEBUG = False

tests/test_shader.py

@@ -4,10 +4,7 @@ import unittest
 
 import torch
 from common_testing import TestCaseMixin
-from pytorch3d.renderer.cameras import (
+from pytorch3d.renderer.cameras import PerspectiveCameras, look_at_view_transform
-    look_at_view_transform,
-    PerspectiveCameras,
-)
 from pytorch3d.renderer.mesh.rasterizer import Fragments
 from pytorch3d.renderer.mesh.shader import (
     HardFlatShader,