![]() ![]() Interreflection (or diffuse interreflection) is the illumination of nearby objects, or parts of the same object, caused by their mutual diffuse reflection. This process increases the time and processing power required to render the image, but produces better results. Instead of reflecting the light (specular reflection), the ray tracer takes samples of multiple diffuse reflection angles. In CGI, diffuse reflection can be calculated by a ray tracer to enhance the photorealism of a rendered image. Even a very smooth surface produces a diffuse reflection at many angles, due to the molecular structure of the material. For instance, a rough surface will reflect light at many angles, depending on its bumps, divots, and grain. Unlike specular reflection, which is calculated based on the surface angle, diffuse reflection is calculated based on the structure of the surface itself. However, if the white light is incident on a rough surface, then it does not reflect all the components and absorbs some of them.Diffuse reflection is the scattering of light that occurs when it reflects off a surface. In other words, if a white light is incident on a smooth surface, then it equally reflects all the components of light. ![]() Rays, thus, remain in a bundle after specular reflection, while they diffuse in many directions in the diffuse reflection of light. The figure given below shows the specular and diffuse reflection of light.Ī light beam is considered as the bundle of light rays traveling parallel to each other, in the specular reflection the light. While the reflection of light from the rough surfaces such as paper, asphalt roadway and clothing, is known as diffuse reflection of light. The reflection of light from calm body of water or other smooth mirror-like reflective surfaces is known as the specular reflection of light. There are many objects other than mirrors, which also possess the same tendency to reflect the light that are not smooth like mirrors. Light can be reflected from different types of surfaces besides mirrors, as well. It is said that light is reflected from mirror-like surfaces, but it is not accurate. The reflection of light depends upon the types of surfaces. Hence, due to the above phenomenon, glossy paper is used in those magazines where there are lots of images and less text to read. It is because of the fact that glossy paper reflects light in bundles and causes glare to be perceivable by the eyes, reading materials on the glossy paper would create hindrance in reading. ![]() It is said that the glossy paper is not used for such magazines that contain lot of reading materials because it will be difficult for the readers to properly read from the glossy paper. Conversely, the reflection caused by the rough surface is known as diffused reflection. When the light reflects from the smooth surface, such as a wet roadway, a shiny mirror or glossy paper, this kind of a reflection is termed as the specular reflection. The reflection of light depends upon the surface type on whether it is smooth or rough. ![]() The law of reflection states that the angle of reflection is the same as that of the angle of incidence. When a light ray incident on the surface subsequently gets reflected from that surface, a normal at the point where the light is incident is drawn in order to determine the angle of incidence and the angle of reflection. Light rays obey a distinct phenomenon of reflection from certain smooth surfaces. ![]()
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