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This VOP uses a specular lighting model with a Fresnel falloff calculation
to generate a color. Typically, adding this lighting model into the network,
is the last thing done before connecting the resulting color to the output
The normal vector is used in the sheen calculation.
The incidence direction ray used in the selected sheen calculation,
A floating point value used to darken or lighten sheen highlight.
The sheen highlight color. It is multiplied by the light color.
Index of Refraction
This value is the ratio of the speed of light in one medium, such as air, to that of another medium. This determines how much the ray bends as it passes into another material. In this context, it effects the amount of specular visible on the front of the surface. Higher values tend to “push” the specular towards the edges.
A floating point value used to control the size or spread of the sheen highlight.
This toggle will change the normal to face forward towards the camera. It is recommended this toggle be on.
The sheen highlight calculation.
Ksheen \* sheenColor * sheen(nN, nI, eta, urough)
The sheen lighting without the multiplication by the sheen intensity or the sheen color. Usually used as an export parameter for extra images planes used in the composite.
The PBR sheen calculation.