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Hello!

Aa beginner question here. :) I have a question regarding classifying objects in a point cloud model if the model has several different off-ground objects also- like trees, cars, traffic signs. What would be the best way to create different classes for each one of them, I have classified the ground and all the other objects are just one class- off-ground. Also is it possible to segment objects in those classes? Like there is a class of cars and each car is segmented separately as car1, car2,... etc?

You should try using qCANUPO to perform the smart classification (but beware that this plugin is powerful but also a little bit complicated ;).
https://www.cloudcompare.org/doc/wiki/i ... O_(plugin)

And once you have classified the points, you can generally extract the subset of points corresponding to each class (with 'Edit > Scalar fields > Filter by SF'). Then objects are generally not connected to each other (well it depends) but at least for these ones, you can simply use the 'Label connected components' tool to separate them.