At the end, I think that the best solution is use setdiff and plot the cloud, without overlap.
plot3 disappear points: graphics problems
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Using Matlab 2017a accademic licence, I am plotting in 3 dimension, three dinstinct clouds of points using this order: the first cloud is the main set of number (blue). Then there is a sub-set of main (color green). Then there is another sub-set (black) which is a subset of 2th cloud (green). In the next image I show you what happen when I modify the view angle.
Here is the results when I save the image using "Edit"->"Copy Figure" (I think that there are problem with black dots in both graph since you can notice that there are only few):
Here is the results when I save the image using "File"->"Save as"->".jpg" (left correct, notice that in the right plot, the black dots deaspier):
Here is what I see from the Matlab figure using Snipping tool (left correct, notice that in the right plot, the black dots deaspier):
The figure is exactly the same.
How do I solve this problem?