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i saw that into the menu EDIT --> LAYER there is the possibility to execute some BOOLEAN OPERATION.
Is it possible execute the same ones automatically using a script?
I would like also add some oversize.
This can be done in DRC scripts. DRC scripts can produce output to new layers or to the input layer. For example to run an AND between layer 1/0 and 2/0, oversize the result by 100nm and store the result in a new layer 10/0 you can use this script:
a = input(1, 0)
b = input(2, 0)
(a & b).sized(100.nm).output(10, 0)