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This is a more sophisticated diffuse calculation than Lambert’s. It provides a roughness exponent to control the spread of the diffuse contribution. Typically its color is the main surface color of the material. This lighting model is often used for materials with no specular contribution, such as clay or chalk or matte paint.
The normal vector is used in the Oren-Nayar diffuse calculation.
The incidence direction ray used in the Oren-Nayar diffuse calculation,
The diffuse intensity.
The diffuse color. This color is most often the main surface color of the material.
A floating point value used to control the size or spread of diffuse contribution.
This toggle will change the normal to face forward towards the camera.
The Oren-Nayar diffuse color contribution:
Kd * diff * diffuse(nN, -nI, rough)
Just Oren-Nayar diffuse lighting without the multiplication by the diffuse intensity or the diffuse color.
The PBR diffuse calculation.