I have tested put several groups one inside the other and add mask to them.
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Thank you for answer.I looked at the newMask documentation and found that it was limited to three.Very embarrassing.How can it be possible with snapshots?I can't feel it.
You do three masks, take a 'snapshot' of the group containing all the images, save that snapshot to disk, load it back as a new image and then continue masking on that image.
Depending on your objects. Another approach could be to have an object and fill it with another object (adjust the fill if needed) and then apply the mask to the first object (3 objects - 2 levels). You can also mess around with composite paint. These are all methods of used but they are specific to the ultimate goal and not a generic solution.