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This VOP uses the dot product of a surface normal and an incident vector to calculate the falloff value for curved surfaces. The return value will be one (1) where the normal and incident vector line up (parallel), and zero (0) where they are at right angles (perpendicular). This does not work on flat surfaces, since there is no variance in the relationship between the normal and incident vectors with flat surfaces. This VOP can be used to create glow effects, simply by multiplying it with a glow color and applying it to a sphere; or to soften edges by multiplying with the opacity. If inverted, it can be used to create an inexpensive Fresnel effect by multiplying it with the output color of an environment map;
The normal vector used in the calculation of the falloff.
This is the incidence direction ray used in the calculation of the falloff.
A floating point value used as the exponent in a power function
This toggle will invert the result. This is useful for creating glows.
This toggle will force the normal to face the camera.
This is the amount of falloff.