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This VOP uses the Lambert lighting model calculation to generate the diffuse color contribution for a material. Typically its color is the main surface color of the material. This lighting model is often used as base for materials where specular is added.
The normal vector is used in the Lambert diffuse calculation.
The incidence direction ray used in the face forward calculation.
The diffuse intensity.
The diffuse color. This color is most often the main surface color of the material.
This toggle will change the normal to face forward towards the camera.
The Lambert diffuse color contribution:
Kd * diff * diffuse(nN)
Just Lambert diffuse lighting without the multiplication by the diffuse
The PBR diffuse calculation.