Rendering Outdoor Light Scattering RRS feed

  • Question

  • Atmospheric scattering of light is important in outdoor scenes. It changes sunlight from the

    Interaction of Light with Particles

    The interaction of light with particles is one of the most fundamental phenomena in graphics

    (surface reflectance is derived from it as a special case). Light, as an electromagnetic wave, is

    affected by the electromagnetic fields of particles of various kinds. When light interacts with a

    particle, the particle may absorb the light (becoming more energetic as a result) or scatter it in

    a new direction. Particles may also emit light on their own

    paper. We assume a basic understanding of the physical nature of light and quantities such as

    radiance and irradiance. If you wish to learn more about such topics there are introductions in

    [Hoffman2001] and [Yee2002].

    – we will ignore this possibility in this

    pale red of dawn to the bright yellow of midday and back again. It determines the color and

    brightness of the sky throughout the day, and it cues us to the distance of objects by shifting

    their colors. All these effects vary not only based on time of day, but also depending on

    weather, pollution and other factors. On planets with different atmospheric compositions, these

    effects would differ significantly from those seen on Earth.

    In this paper, we will explain the ways in which atmosphere affects light, including the

    underlying theory. We will show the deficiencies of the commonly-used fog model, and

    describe models which are more physically accurate.

    Tuesday, March 20, 2007 8:47 AM

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