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Fix conversion from Blender to COLMAP coords in NeRF camera import. (#111)

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Co-authored-by: Jakub Červený <jakub.cerveny@melowntech.com>
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Jakub Červený 2023-08-24 17:38:48 +02:00 committed by GitHub
parent 073775efbd
commit 0f125cbd5f
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1 changed files with 9 additions and 4 deletions
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13
scene/dataset_readers.py
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@ -187,10 +187,15 @@ def readCamerasFromTransforms(path, transformsfile, white_background, extension=
for idx, frame in enumerate(frames):
cam_name = os.path.join(path, frame["file_path"] + extension)
matrix = np.linalg.inv(np.array(frame["transform_matrix"]))
R = -np.transpose(matrix[:3,:3])
R[:,0] = -R[:,0]
T = -matrix[:3, 3]
# NeRF 'transform_matrix' is a camera-to-world transform
c2w = np.array(frame["transform_matrix"])
# change from OpenGL/Blender camera axes (Y up, Z back) to COLMAP (Y down, Z forward)
c2w[:3, 1:3] *= -1
# get the world-to-camera transform and set R, T
w2c = np.linalg.inv(c2w)
R = np.transpose(w2c[:3,:3]) # R is stored transposed due to 'glm' in CUDA code
T = w2c[:3, 3]
image_path = os.path.join(path, cam_name)
image_name = Path(cam_name).stem