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... 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.
Approximate Word count = 1028
Approximate Pages = 4.1
(250 words per page double spaced)
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