Hi Claudio,
I end up using this method from Hydrashare
http://hydrashare.github.io/hydra/viewer?owner=mostaphaRoudsari&fork=hydra_1&id=Perforated_mesh&slide=0&scale=1&offset=0,0
You can modify the radius and the distance between centers to create any kind of perforated screen.
Best regards,
Julio