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flat shading fix

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Summary:
Make flat shading differentiable again

Currently test fails with P130944403 which looks weird.

Reviewed By: nikhilaravi

Differential Revision: D21567106

fbshipit-source-id: 65995b64739e08397b3d021b65625e3c377cd1a5
This commit is contained in:
Georgia Gkioxari 2020-05-14 13:32:25 -07:00 committed by Facebook GitHub Bot
parent 728179e848
commit a0e14cae1e
1 changed files with 15 additions and 2 deletions
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17
pytorch3d/renderer/mesh/shading.py
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@ -153,8 +153,21 @@ def flat_shading(meshes, fragments, lights, cameras, materials, texels) -> torch
face_normals = meshes.faces_normals_packed() # (V, 3)
faces_verts = verts[faces]
face_coords = faces_verts.mean(dim=-2) # (F, 3, XYZ) mean xyz across verts
pixel_coords = face_coords[fragments.pix_to_face]
pixel_normals = face_normals[fragments.pix_to_face]
# Replace empty pixels in pix_to_face with 0 in order to interpolate.
mask = fragments.pix_to_face == -1
pix_to_face = fragments.pix_to_face.clone()
pix_to_face[mask] = 0
N, H, W, K = pix_to_face.shape
idx = pix_to_face.view(N * H * W * K, 1).expand(N * H * W * K, 3)
# gather pixel coords
pixel_coords = face_coords.gather(0, idx).view(N, H, W, K, 3)
pixel_coords[mask] = 0.0
# gather pixel normals
pixel_normals = face_normals.gather(0, idx).view(N, H, W, K, 3)
pixel_normals[mask] = 0.0
# Calculate the illumination at each face
ambient, diffuse, specular = _apply_lighting(