What's the difference between byPick and visibleByPick selection modes?

byPick, byBox and byPolygon selection modes are based on geometric computations whilst visibleByPick, visibleByBox and visibleByPolygon ones are based on fake colors (pixel colors) approach.

The main difference between the two is that with the former group of selection modes you have no control on the order of the returned objects, while with the latter you always get the object closer to the observer.

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