Describe the bug

QGIS will load my LAZ file, but it will only show the file extents. It won't show points in 2D or 3D map. I have installed and uninstalled QGIS several times and I have used the rebooted OSGEO4W installer as well as the Standalone installers from OSGeo4W testing packages (MSI).

How to Reproduce

Drag and drop an LAZ file from the browser onto the map. The bounding box will be displayed immediately. Here is the LAZ file I used - nb_2017_2418000_7497000

The ept folder was created (ept_nb_2017_2418000_7497000) but it was empty. The log messages for Point clouds included:

2021-04-10T13:20:22 INFO Using executable C:/Program Files/QGIS31~1.1/apps/qgis/./untwine.exe

However, the actual path on my laptop is "C:\Program Files\QGIS 3.18.1\apps\qgis\untwine.exe". I noticed this problem with the untwine path in the C:\OSGEO4W install and the C:\Program Files\QGIS 3.18.1 install.

Can I change the path to the untwine executable in QGIS?

QGIS and OS versions

QGIS version 3.18.1-Zürich
QGIS code revision 202f1bf
Compiled against Qt 5.15.2
Running against Qt 5.15.2
Compiled against GDAL/OGR 3.2.2
Running against GDAL/OGR 3.2.2
Compiled against GEOS 3.9.1-CAPI-1.14.2
Running against GEOS 3.9.1-CAPI-1.14.2
Compiled against SQLite 3.35.2
Running against SQLite 3.35.2
Compiled against PDAL 2.2.0
Running against PDAL 2.2.0 (git-version: 24dd45)
PostgreSQL Client Version 13.0
SpatiaLite Version 5.0.1
QWT Version 6.1.3
QScintilla2 Version 2.11.5
Compiled against PROJ 8.0.0
Running against PROJ Rel. 8.0.0, March 1st, 2021
OS Version Windows 10 Version 1709
Active python plugins db_manager;

Windows 10 Enterprise

  • 1
    Are you aware of this? gis.stackexchange.com/a/388600/88814
    – Babel
    Commented Apr 11, 2021 at 21:46
  • Yes I am aware that only some of the installers for version 3.18 include the point cloud support. I am certain I have used the proper installer to get the point cloud features. I have used the same installer on another laptop and it works. For some odd reason I am having this problem only on my work laptop. Commented Apr 11, 2021 at 23:28
  • 1
    @Ian Turton: To me, the question seems focued: "Can I change the path to the untwine executable in QGIS?" and not related to one of the reasons mentioned (licensing, pricing, release dates, submission of bug reports and enhancement requests, etc.).
    – Babel
    Commented Apr 12, 2021 at 8:09
  • 1
    Then it would be better to make the question clearer and not start with the word bug which makes it look a lot like a "bug report" to me
    – Ian Turton
    Commented Apr 12, 2021 at 9:29
  • those 2 paths seem to be identical to my eye (though I'm not expert on windows path mangling).
    – Ian Turton
    Commented Apr 12, 2021 at 10:15

1 Answer 1


untwine executable path can be changed by setting up environment variable QGIS_UNTWINE_EXECUTABLE.

But, if QGIS reports INFO Using executable ...\untwine.exe it means the executable was found and used correctly. The difference between the reported path and the actual path on disk is just some path mangling in the logs.

I can load the file on macOS, QGIS 3.18, but it takes around a minute on my computer to preprocess the LAZ file (you can see the progress bar for background task that creates point cloud index)

QGIS Point Cloud

  • if the file does not load on your computer I suggest to create a QGIS bug report Commented Aug 20, 2021 at 8:31

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