Bounding box not working when extracting a mesh with ns-export poisson

[maurock]

Thank you very much for this awesome library! I'm encountering an issue when I extract a mesh from a Nerfacto representation using ns-export poisson. Instead of extracting the object, the resulting mesh represents a hemisphere surrounding the object. This suggests that the white background is being reconstructed, which could be part of the issue.

TO mitigate this problem, I used the --bounding-box parameters to restrict the volume:

ns-export poisson ... --bounding-box-max 0.1 0.1 0.1 --bounding-box-min -0.1 -0.1 -0.1 --use-bounding-box True

However, this did not change the output. I saw that older version of nerfstudio use --obb parameters rather than bounding boxes, so I am wondering whether there is a bug in the current configuration. Could you please advise on whether I am setting the boundaries incorrectly?

Thank you for your time!

[Charley-xiao]

Same issue. Did you resolve it? 😢

[maurock]

Hi @Charley-xiao, unfortunately I have not solved the issue yet. Looking at the code, I believe there is a bug in the --bounding-box parameters as they are not used. A suboptimal workaround I am using is to call one of the classes in nerfstudio/scripts/exporter.py. There, you can pass the obb parameters, and they work as intended. Although it is not the same as simply passing the boundaries of a bounding box.

I should mention that the quality of the extracted mesh is extremely poor. They're just floaters in my case, on a simple YCB object with known camera parameters. There might be something else I need to do to extract a proper mesh, and I'd be very grateful for any advice the authors might have. I have used 40 images in the training set and 10 in the test set.

[IsaacBerman]

Yes, it seems to have broken in a newer version, causing really bad results on low iteration trainings (this didn't exist in old versions). Does anyone know if the authors have posted a solution anywhere?

[IsaacBerman]

This seems related/same issue: #3581