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merged 2 commits into from
Oct 9, 2025
Merged

Improve PLY loading robustness and error handling #150

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c792c44
Improve PLY loading robustness and error handling
Hermanye996 Sep 11, 2025
2a4a40b
Update threedgrut/model/model.py
Hermanye996 Oct 9, 2025
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4 changes: 3 additions & 1 deletion threedgrut/export/scripts/ply_to_usd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -98,8 +98,10 @@ def main():
logger.info(f"Successfully exported to {output_path}")
except Exception as e:
logger.error(f"Error processing PLY file: {e}")
import traceback
logger.error(f"Full traceback: {traceback.format_exc()}")
sys.exit(1)


if __name__ == "__main__":
main()
main()
21 changes: 15 additions & 6 deletions threedgrut/model/model.py
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Expand Up @@ -685,12 +685,21 @@ def init_from_ply(self, mogt_path:str, init_model=True):
extra_f_names = [p.name for p in plydata.elements[0].properties if p.name.startswith("f_rest_")]
extra_f_names = sorted(extra_f_names, key = lambda x: int(x.split('_')[-1]))
num_speculars = (self.max_n_features + 1) ** 2 - 1
assert len(extra_f_names)==3*num_speculars
mogt_specular = np.zeros((num_gaussians, len(extra_f_names)))
for idx, attr_name in enumerate(extra_f_names):
mogt_specular[:, idx] = np.asarray(plydata.elements[0][attr_name])
mogt_specular = mogt_specular.reshape((num_gaussians,3,num_speculars))
mogt_specular = mogt_specular.transpose(0, 2, 1).reshape((num_gaussians,num_speculars*3))
expected_extra_f_count = 3 * num_speculars

mogt_specular = np.zeros((num_gaussians, expected_extra_f_count))
if len(extra_f_names) == expected_extra_f_count:
# Full spherical harmonics data available
for idx, attr_name in enumerate(extra_f_names):
mogt_specular[:, idx] = np.asarray(plydata.elements[0][attr_name])
mogt_specular = mogt_specular.reshape((num_gaussians,3,num_speculars))
mogt_specular = mogt_specular.transpose(0, 2, 1).reshape((num_gaussians,num_speculars*3))
elif len(extra_f_names) == 0:
# Only DC components available, create zero-filled higher-order harmonics
logger.info(f"PLY file only contains DC components, initializing higher-order spherical harmonics to zero")
else:
# Partial data - this is unexpected
raise ValueError(f"Unexpected number of f_rest_ properties: found {len(extra_f_names)}, expected {expected_extra_f_count} or 0")

scale_names = [p.name for p in plydata.elements[0].properties if p.name.startswith("scale_")]
scale_names = sorted(scale_names, key = lambda x: int(x.split('_')[-1]))
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