CS781 - Colour for Computer Graphics - Winter 2009

Lecture 3

Transmission of Light

Waves

Light obeys the wave equation: Grad( Div Y ) = (c/n(x))^2 (d / dt )^2 Y

Some things need explaining

Refraction

If n(x) is not constant, the wavefront can change direction. The simplest case is a discontinuous change in n(x) on a plane.

Chromatic aberration

n(x) is a weak function of wavelength

Prism

Reflection

Rainbow on the CD

Bidirectional Reflectance Distribution Function

Rainbow in the air

Was anybody out, and looking up, on Friday night about midnight?

Scattering

Sky

Fog

The Eikonal

Suppose we try the substitution: k \ dot x --> S(x)


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