About the idea of cropping freehand in 3D Slicer

I have a question. I read code in qSlicerSegmentEditorScissorsEffect.cxx so. What is the idea of it?

The scissors effect allows deleting (or filling) a region intuitively by marking it with the mouse in a 2D or 3D view.

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Do you have any documents about it?

See the Slicer user manual for some information: Segment editor — 3D Slicer documentation

There are also many tutorials on YouTube.