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Energy of Illumination

Electromagnetic energy flux, the amount of energy traveling
Spectral Properties:
Total energy flux comes from flux at each wavelength

For the indicated situation is

Energy per unit time (as in the picture)
Total power leaving a surface point per unit area
(integral is over the hemisphere above the surface point)

Bidirectional Reflectance Distribution Function:

Energy Balance Equation:

CS488/688: Introduction to Interactive Computer Graphics
University of Waterloo
Computer Graphics Lab