Inserts an edit point at the selected curve point.
Set to inserts an absolute number of knots according to the Multiplicity value. For example, if Multiplicity is 3 and At Selection is on, three knots will be inserted at the point whether or not it has an existing knot. Multiple knots at any position lets you create a sharp corner there.
Increase by adds extra knots to the point according to the Multiplicity value.
If you turn on Between Selections and set Multiplicity higher than 1, Maya creates multiple knots at each knot, with even spacing between the positions.
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