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