hello Alberto and Mikail i do not agree with your method Surface(2) is not cylindrical, you ca see that if you increase r
the intersection of two intersecting cylinder cannot be defined as a (plane) circle it is a 3 D curve like in the enclosed pics one large pipe intersected at 45° by a smaller one (smaller pipe not shown here) if you want i can post here the bit of code that do it jean pierre aubry -- jean pierre aubry 33 688 670 795
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