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Not sure to understand, as this tool is meant to compute the volume between 2 different 'states' of the stockpile. If your 4 scans are representing the same epoch, then you can simply merge them (Edit > Merge) and then use a constant altitude in the 2.5D calculation tool. Else, I'm not sure to under...

Would you be able to share the files with me? (admin@cloudcompare.org)

Weird...

Does it happen with a specific mesh?

And also when you hide the to-be-aligned entity?

Than you could try to mesh it (probably with Delaunay 2.5D) and if it looks viable, then sample a lot of points over this mesh (with Edit > Mesh > Sample points).

Have you proprely 'INSTALLED' the solution? (make install)

The only tool to compute volume from a point cloud is the '2.5D Volume computation' tool (https://www.cloudcompare.org/doc/wiki/i ... .5D_Volume)

But it's working under quite specific conditions, and you'll need a very dense point cloud (which doesn't seem to be the case here?)

Not really...

You can definitely set the camera to look from the top (with orthographic projection), and you'll still see the colors and optionally the color scale to the right... but not in a fancy way like your example.

Oh, that was a good call: this was actually missing in the documentation, but you can use the -RESAMPLE sub-option (I've updated the wiki).

You have to enable the QCORE_IO_PLUGIN project (CMake option PLUGIN_IO_QCORE).

So the 'Visible' option (and all color scale options as well) are in the cloud properties (on the left side, below the DB tree, once a cloud is highlighted. And you can create an absolute color scale, with labels, etc. with the 'Color scales manager' : https://www.cloudcompare.org/doc/wiki/index.php...