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The Diffuse material simulates pure diffuse surfaces like clay. This material is also able to simulate thin translucent diffuse surfaces such as paper. For geometries defining enclosed volumes, it is best to use the SSS material instead.

Lambertian Model

Lambertian Model

Rough Translucent Oren Nayar

Rough Translucent Oren Nayar

Attribute Description
Energy Mode Set the energy mode while composing front and back components. When set to Additive the energy received from the back is added to the front while in Conservative gains are normalized to ensure energy conservation.
Front color Define the diffuse color of the material.
Front Gain Define the intensity of the front color.
Back color Define the color of the transmitted light from the back of the surface to simulate a thin translucent surface.
Back gain Define the intensity of the translucent color.


The material supports multiple BRDFs to simulate different kind of diffusion.

Mode Description
Fresnel Lambertian Improve the the lambertian model by added a Fresnel term to approximate rough diffusion reflection.
Oren Nayar Improve lambertian model by simulating back-scattering effects that characterize rough diffuse reflection. Basic, Improved and Full are different variations of the model with the later being the most accurate while a dent slower.


The Roughness attribute set the roughness of the surface which directly affects how the light is scattered on the surface.

Attribute Description
Roughness sets the roughness of the surface which affects how the light is scattered on the surface.