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Split one or more vertices so that each face that shared the vertex acquires its own copy of the vertex. This operation will affect all the edges and faces that shared the vertex. Also, this operation may create non-manifold geometry as a part of this operation. You can use Polygons->Cleanup afterwards to to clean up any non-manifold geometry.

Node nameParentsClassificationMFn typeCompatible function sets
polySplitVertpolyModifierWorldgeometrykPolySplitVertkBase
kNamedObject
kDependencyNode
kMidModifier
kPolySplitVert