How Do I Use the Normal Filter?

I want to mask off different sides of an object that has sharp edges. How do I set the normal filter so that it only masks the side i start on and doesnt “spill over” the sharp corner. I’ve tried looking for how the normal filter is supposed to work but i cant find anything on it.

Mask Settings > Filter > Front Vertex Only

I should have said its for an inside corner, so front facing vertices doesnt work here since both faces are still visible.

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Maybe more like this ?