What is the difference between add stitching to net and add shielding to net ?
In my understanding in both case it create via to shield some part of the cricuit...
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Via shielding is meant to shield a net (read: a track) from disturbances: Think of an RF signal trace that gets shielding GND vias left and right of it that follow the trace.
Via stitching is meant to connect a signal on one layer with the same signal on another layer. Think of connecting a VCC polygon pour on top with a corresponding power plane. The vias generated for this kind of connection are meant to be evenly distributed over an area (which can be along a line, but doesn't have to be)
Both work similar but via shielding follows a trace without you having to specify the area manually. Since both add vias of a requested net, you can accomplish similar tasks with them. Its more like a different use case in mind.