Illumination model and light sources
... An Illumination Model or a Lighting model or a Shading model, is used to calculate the intensity of light that should be seen at a given point on the surface of an object.A surface rendering algorithm uses the intensity calculations from an illumination model to determine the light intensity for all projected pixel positions for the various surfaces in a screen. basic definitions Illumination - the transport of luminous flux from light sources between points via direct and indirect paths Lighting - the process of computing the luminous intensity reflected from a specified 3-D point Shading - the process of assigning colors to a pixels. ... Light reflections 2. ... Shadows Types of Illumination models:- Empirical : simple formulations that approximate observed phenomenon Java3D : Real Time illumination model : lots of approximations. ... Illumination models can also be classified into two types on the basis of contribution of incident light. ... Local Illumination model : Model takes into account the incident light only by the light source, Shading of a surface independent from shading of other surfaces, very empirical, easy computation 2.Global Illumination model : Adds to the Local Model the light reflected from other surfaces to the current surface, more realistic, more complicated Light sources can be categorised into various types in computer graphics 1.