Conversion from .las to .ply generates a subsampled pointcloud

[julien38]

Hello,

I am trying to convert a massive (4,294,967,295 points) .las pointcloud into a .ply pointcloud. However, whether I try to do it by using CLI CloudCompare :

Code: Select all

 CloudCompare -O ./pointcloud.las -C_EXPORT_FMT PLY -SAVE_CLOUDS

or try to open my .las file in the GUI CloudCompare in order to save it as a .ply file. I always end up by getting in output a .ply file that seem to have been subsampled with a "straight lines pattern".

Here's a picture of the output pointcloud

Capture d’écran 2023-07-26 à 09.36.09.png (533.54 KiB) Viewed 8216 times

Have you ever seen anything like this happen, and do you have any tips on how I can complete my conversion without degrading the quality of the pointcloud ?

Here's the system I am using :
OS : Windows 10,
RAM : 32 GB
CPU : Intel i7 7700K
GPU : NVIDIA GeForce RTX 2070

[daniel]

You need to use the '-GLOBAL_SHIFT AUTO' option after '-O' to tell CC to automatically shift the large coordinates (temporarily) to avoid losing numerical accuracy.