Similar to the Curve node, but uses Unity animation curve interface instead. This gives more flexibility and control at the price of increased generate time.
Inlet (mandatory) - a source map.
Mask - the node effect opacity mask. The higher the value of the mask - the more visible curve effect is.
Curve field: displays a curve preview. Clicking on it will open up a Curve Editor window - the standard Unity curve editing tool (see Unity manual: https://docs.unity3d.com/Manual/EditingCurves.html for more information).