![]() Such surfaces are called "Ideal diffuse (matte) surfaces" or "Lambertian surfaces." The directional semi-spherical reflection for the Lambert surfaces is often called "diffuse reflectance" or "albedo". ![]() They do not vary according to the angle we look at, so these surfaces look almost the same according to any direction we look at. So, when photons hit a rough surface, they are scattered randomly instead of a hemispherical scatter. It is therefore more reasonable to describe the diffuse reflection over rough surfaces. ![]() In reality all surfaces are more or less rough. If the surface is a smooth surface, the distribution of the photons is hemispherical, but there is no perfect smooth surface in nature. In this material, when the photons hit the surface, they are reflected in many different directions irrespective of the angle of incidence of light. Diffuse materials are simple materials compared to the other types.
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