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If the clouds are already roughly registered, then you can probably try to automate things with the command line. You'll have the ability to do automatic registration (-ICP) and compute distances (C2M_DISTS, etc).

See https://www.cloudcompare.org/doc/wiki/index.php/Command_line_mode

There's ...

I don't know if Orbis files are supported or not... Is it an 'fls' file or something similar?

So for '1', as soon as you export the aligned mesh to STL, it should be saved with the transformed coordinates. So it should keep its aligned position.

For '2', you can use the scissors tool, but you might want first to sample points on the mesh to be able to make a finer selection. Then, compute ...

Which file type are you loading?

Yes, you have to select the entities (inside the 'folder' or 'group' entities that we can see on the capture). Each time you open a file, a 'group' entity is created, with all the 3D entities inside.

Which version are you using and on which OS?

Sorry, I missed the previous messages. Can you send me a long to the example file directly to 'admin@cloudcompare.org'?

So, the I/O filter has been updated already. I'm just waiting for some feedback from someone owning real PTX files with normals.

Ok, I've made the change in the latest 2.14.beta version online (for Windows). Tell me if it works.

And even better, if you could send me a sample file, that would very useful to check that I've done things correctly.

So referring to the code and to https://paulbourke.net/dataformats/ptx/ , the sensor position and orientation is stored in rows 3-6 (row 3 is the sensor center, and the next 3 rows are the X, Y and Z vectors).

Rows 7-10 store the global transformation matrix that applies to the points (and I would ...