E. Agu, and F.S. Hill, Jr. (USA)
diffraction, iridescence, illumination models, raytracer.
Diffraction and interference are optical phenomena
which split light into its component wavelengths, hence
producing a full spectrum of iridescent colors. This
paper develops computer graphics models for iridescent
colors produced by diffractive media. Diffraction
gratings, certain animal skins and the crystal structure
of some precious stones are known to produce
diffraction. Several techniques can be employed to
derive solutions to the diffraction problem including:
(1)Electromagnetic boundary value methods
(2)Applying the Huygens-Fresnel principle (3)Applying
the Kirchoff-Fresnel theorem (4)Fourier optics.
Previous work in developing diffraction models for
computer graphics has used boundary value methods
and Fourier optics but no models using Huygens
Fresnel principle have been published. This paper
derives a set of diffraction solutions based on the
Huygens-Fresnel principle, which are then used to
extend well-known illumination models and are
incorporated into a ray tracer.