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Illumination Models
When we see a surface, we actually see the light reflected from that surface. The process of light-surface interaction is a very complicated one, affected by many factors. Some of these are geometric factors, such us the positions and orientations of the surface, the ?Light Source, and the observer. Other factors are related to the nature of the surface material itself, and its sub-atomic interactions.
Illumination models are ?Mathematical Models - usually expressed in terms of an ?Illumination Equation - that attempt to simulate light-surface interaction in nature. They dictate how light is reflected from or refracted through surfaces. While some illumination models are physically-based, many aren't; they introduce simplifications that have no firm grounding in theory. However, they're still used because they work in practice, and are simple to implement.
Illumination models can be classified into 2 broad categories:
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Illumination Models
When we see a surface, we actually see the light reflected from that surface. The process of light-surface interaction is a very complicated one, affected by many factors. Some of these are geometric factors, such us the positions and orientations of the surface, the ?Light Source, and the observer. Other factors are related to the nature of the surface material itself, and its sub-atomic interactions.
Illumination models are ?Mathematical Models - usually expressed in terms of an ?Illumination Equation - that attempt to simulate light-surface interaction in nature. They dictate how light is reflected from or refracted through surfaces. While some illumination models are physically-based, many aren't; they introduce simplifications that have no firm grounding in theory. However, they're still used because they work in practice, and are simple to implement.
Illumination models can be classified into 2 broad categories:
- Local Illumination
- ?Global Illumination
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