This is meant to read a xyz
file, like the ones provided by the SHOM here:
And triangulates against the dataset to generate a mesh from it.
If you want to open a LAS/LAZ file (and if you want to compile the code anyway), you will need to setup the PDAL library, as done in here:
https://github.com/pmauduit/lopocs/blob/docker-compo/docker/lopocs/Dockerfile#L7-L21
Here is a screenshot when launched on the LiDAR files provided by SNCF OpenData