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PyTorch3D - Avoid flip in TexturesAtlas

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Summary: Performance improvement: Use torch.lerp to map uv coordinates to the range needed for grid_sample (i.e. map [0, 1] to [-1, 1] and invert the y-axis)

Reviewed By: bottler

Differential Revision: D51961728

fbshipit-source-id: db19a5e3f482e9af7b96b20f88a1e5d0076dac43
This commit is contained in:
Eric Young 2023-12-11 12:49:17 -08:00 committed by Facebook GitHub Bot
parent 94da8841af
commit 06cdc313a7
2 changed files with 13 additions and 5 deletions
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16
pytorch3d/renderer/mesh/textures.py
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@ -995,9 +995,13 @@ class TexturesUV(TexturesBase):
# is the left-top pixel of input, and values x = 1, y = 1 is the
# right-bottom pixel of input.
pixel_uvs = pixel_uvs * 2.0 - 1.0
# map to a range of [-1, 1] and flip the y axis
pixel_uvs = torch.lerp(
pixel_uvs.new_tensor([-1.0, 1.0]),
pixel_uvs.new_tensor([1.0, -1.0]),
pixel_uvs,
)
texture_maps = torch.flip(texture_maps, [2]) # flip y axis of the texture map
if texture_maps.device != pixel_uvs.device:
texture_maps = texture_maps.to(pixel_uvs.device)
texels = F.grid_sample(
@ -1035,8 +1039,12 @@ class TexturesUV(TexturesBase):
texture_maps = self.maps_padded() # NxHxWxC
texture_maps = texture_maps.permute(0, 3, 1, 2) # NxCxHxW
faces_verts_uvs = faces_verts_uvs * 2.0 - 1.0
texture_maps = torch.flip(texture_maps, [2]) # flip y axis of the texture map
# map to a range of [-1, 1] and flip the y axis
faces_verts_uvs = torch.lerp(
faces_verts_uvs.new_tensor([-1.0, 1.0]),
faces_verts_uvs.new_tensor([1.0, -1.0]),
faces_verts_uvs,
)
textures = F.grid_sample(
texture_maps,

2
tests/test_render_meshes.py
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@ -932,7 +932,7 @@ class TestRenderMeshes(TestCaseMixin, unittest.TestCase):
)
).save(DATA_DIR / f"DEBUG_test_joinuvs{i}_map3.png")
self.assertClose(output, merged)
self.assertClose(output, merged, atol=0.005)
self.assertClose(output, image_ref, atol=0.005)
self.assertClose(mesh.textures.maps_padded()[0].cpu(), map_ref, atol=0.05)