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Guide > Learning > Lighting > Global
Illumination > Caustics
Caustics
In
real-life, light travels in a straight line until it is either bounced,
transmitted, or absorbed by a surface. Traditonally, computer graphics
rendering focuses on direct illumination does not take these secondary
effects into account. Global Illumination considers both direct
and indirect light such as the light bouncing from one surface to
another (irradiance) or transmitting through a transparent object
(caustics).
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