Tutorial reconstruction example does not work for me

Author: bashtavenkoCreated Sep 1, 2026Updated Sep 2, 2026

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Checklist

I have searched for similar issues.
For Python issues, I have tested with the latest development wheel.
I have checked the release documentation and the latest documentation (for main branch).

Describe the issue

Built from source on Ubuntu 24.

* Version 0.19.0+fb693b6c9

So far everything works except for the reconstruction.

Following https://www.open3d.org/docs/release/tutorial/reconstruction_system/system_overview.html

I am not sure if this tutorial refers to t_reconstruction_system or reconstruction_system. In either cases it did not work for me.

I ran

bash

python run_system.py --make --register --refine --integrate

it bombs with

Traceback (most recent call last):
  File "/home/sb/Open3D/examples/python/reconstruction_system/run_system.py", line 116, in <module>
    register_fragments.run(config)
  File "/home/sb/Open3D/examples/python/reconstruction_system/register_fragments.py", line 203, in run
    make_posegraph_for_scene(ply_file_names, config)
  File "/home/sb/Open3D/examples/python/reconstruction_system/register_fragments.py", line 170, in make_posegraph_for_scene
    initializer=limit_open3d_threads) as pool:
                ^^^^^^^^^^^^^^^^^^^^
NameError: name 'limit_open3d_threads' is not defined

I copied the file examples/python/open3d_example.py to examples/python/reconstruction_system.

It completes the run without an error, but does not work, meaning

It has 000 fragments

Fragment 000 / 029 :: integrate rgbd frame 99 (100 of 100).
====================================
Elapsed time (in h:m:s)
====================================
- Making fragments    0:01:31.343648
- Register fragments  0:00:00.012145
- Refine registration 0:00:00.007886
- Integrate frames    0:00:00.713844
- SLAC                0:00:00
- SLAC Integrate      0:00:00
- Total               0:01:32.077523

In debug mode the viewer opens an empty frame

No .ply file written.

Steps to reproduce the bug

python

See above

Error message

See above

Expected behavior

It should work according to the tutorial page.

Open3D, Python and System information

markdown

I don't think the versions are relevant, everything runs correctly up to this point.

Additional information

I am not sure that copying or moving open3d_example.py is the real solution, I just wanted to see the reconstruction running correctly.

Source: isl-org/Open3D

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