Shading Components
Shading Components | LightingIn the light of the surface is calculated as the sum of the components of the ambient, diffuse and specular from all light sources in the scene (ideally from all, often neglected by many). Impact on the value of each source of light depends on the distance between the light source and a point on the surface.
Uniform component of light (ambient) - the approximation of the global lighting, "initial" lighting for each point of the scene, in which all points covered equally and illumination does not depend on other factors.
The diffuse component of the light (diffuse) depends on the position of the light source and from normal surface. This component of lighting is different for each of the peaks of the object that gives them the volume. The light is no longer fills in the surface of the same shade.
�������� component of light (specular) is manifested in the specks of reflected rays of light from the surface. For its calculation, in addition to the vector of the source of light and normal, used two of the Vector: vector of the Direction sight and the vector of reflection. �������� component first proposed Fong. These glare significantly increase the realism of the image, because rare real surface, do not reflect light, so the specular component is very important, especially when driving, because the lens flare i can change the position of the camera or the object itself. In the future, researchers have invented different ways to calculate this component, the more complicated (�����, Cook Torrance, Ward), taking into account the energy distribution of light, his absorption of the materials and dissipate in the form of diffuse component.
