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Subtraction of surface lists

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@jacopo.romanin wrote:

Hi, i need to split a list of surfaces into two lists. I already got one of these, so i suppose that i can subtract this from the other one, but the solution does not works. If i use th command “cull pattern” the result is the same as the list I want to subtract, if i use the command “set difference” appears the error “Invalid cast: Surface » Primitive Data Type”. Any idea?schermature variante.gh (25.1 KB)

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