CloudCompare forum

Are you sure you have selected multiple clouds (or meshes)? Because this popup only appears if you select at least 2 entities. Else the dialog automatically falls back to a single cloud registration mode (with input GCPs).

I think the issue might more probably come from the other software tool with which you load the FBX file? Only a few can handle per-vertex RGB colors (they generally use textures).

You can only see if in orthographic projection (as with perspective projection, instead of a line aligned with the camera direction (+Z), it's an oblique line in 3D).

I double expensive SW use a brute force approach. I was just implying it's the easiest to implement.

We had in the past in CC a more refined algorithm named '4-CPS' (but its implementation was very buggy and the initial contributor never maintained it, so we had to remove it eventually):
https ...

Hum, I guess you'll have to indeed try to add a first pass to find the rough alignment. Something like what you suggest would work but it can be very time consuming (i.e. rotating the cloud every 5 degrees and trying to perform the alignment, and then keeping the best result). Or you can dabble with ...

Which version are you using?

The way the red X, green Y and blue Z appear on the left side of the label is weird. And also, how and when was the 'coord Z' scalar field generated? Does it really match the coordinates in the current cloud position?

Last, even if I agree it's a different problem ...

There's no way to select a point based on its index at the moment. But you can generate the 'point index' scalar field (Edit > Scalar fields > Add point indexes SF'), and then user the scalar field min/max displayed values, or the ''Edit > Scalar field > Filter by value' to isolate this point.

Can you share the link to the plugin code? (ideally it should be in a dedicated repository that we could add as a submodule).

And don't hesitate to move this discussion to github (it will be easier).

So for the second request, you already have the 'a' or 'v' shortcut (see 'Edit > Toggle (recursive)' menu).

For the other one, it might not be easy to have a 'memory' of the previous selection, but at least an option 'hide all others' would make sense.

I think it's because of the Python plugin (that loads the Python environment). If you don't use it, you can probably uninstall and re-install CC without it.