This mask can be very effective to do Fresnel effects and some shader setups.
Parameters
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Referential (Referential Choice) : Referential of the normal
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Direction (3D Direction) : Direction of the normal
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Orientation (Normal Geometry Mask Mode) : Orientation of the normal
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Spread (Angle (0 - 360 deg) Interval) : Spread of the normal
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Exponent (Positive floating point number) : Exponent of the normal