Point cloud conversion - Export to vector with virtual point cloud as datasource fails

[PeterDrexel]

What is the bug or the crash?

Using Processing Toolbox - Point cloud conversion - Export to vector with virtual point cloud as datasource fails

Steps to reproduce the issue

1. Open a vpc (in my case referencing ~100 *.copc.laz -tiles) in QGIS -> Point show up in QGIS

2. In Processing-Toolbox open Point cloud conversion - Export to vector - select the vpc as input layer and set the crop extent to a rectangle containing a portion of 4 vpc-tiles. set Export gpkg and press RunLogfile Shows:

Algorithm started at: 2025-01-28T14:12:08
Algorithm 'Export to vector' starting…
Input parameters:
{ 'ATTRIBUTE' : [], 'FILTER_EXPRESSION' : '', 'FILTER_EXTENT' : '-50079.942900000,-49901.336300000,242437.954200000,242556.515000000 [EPSG:31254]', 'INPUT' : 'vpc://d:/vlbg/pc2023.vpc', 'OUTPUT' : 'D:/out.gpkg' }
wrench command: C:/PROGRA~1/QGIS34~1.1/apps/qgis/./pdal_wrench.exe to_vector --input=d:\vlbg\pc2023.vpc --output=D:/out.gpkg "--bounds=([-50079.9, -49901.3], [242438, 242557])" --threads=48
0 - done. 
Process completed successfully
Execution completed in 41.93 seconds
Results:
  OUTPUT: D:/out.gpkg
Loading resulting layers
The following layers were not correctly generated.
• D:/out.gpkg
You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm._** 

3. In fact the tool does not create the geopackage "out.gpkg"in the Folder "d:/". Instead it creates a Folder named "d:/out/" containing geopackages for all the files referenced in the vpc, but only the 4 tiles overlaping the crop-extent contain points.

Versions

3.40

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[alexbruy]

This is not a bug. to_vector command of wrench tool supports VPC only on a per-file basis.

[saberraz]

This looks like a wider discussion to have VPC as a propoer in/out file for the PC processing toolbox. I have opened #60336 to cover all algorithms.

[PeterDrexel]

I would still call it a bug because the tool does offer to select a vpc as source and does everything but not the final step.
We are willing to fund this and other issues in relation to PDAL wrench (#60336)