“Atmospheric illumination and shadows” by Max

  • ©Nelson L. Max




    Atmospheric illumination and shadows



    The shadow volume algorithm of Frank Crow was reorganized to provide information on the regions of illuminated space in front of each visible surface. This information is used to calculate the extra intensity due to atmospheric scattering, so when the atmosphere is partly in shadow, columns of scattered light will be visible. For efficiency in sorting the shadow edges, the image is computed in polar coordinates.


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    2. Atherton, Peter, Weiler, Kevin, and Greenberg, Donald, “Polygon Shadow Generation,” SIGGRAPH ’78 proceedings, pp. 275-281.
    3. Crow, Franklin, “Shadow Algorithms for Computer Graphics,” SIGGRAPH ’77 proceedings, pp. 242-248.
    4. Nishita, Tomoyuki, Okamura, Isao, and Nakamae, Eihachiro, “Shading Models for Point and Linear Sources,” ACM Transactions on Graphics, Vol 4 no. 2 (1985), pp. 124-146.
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    7. Cook, Robert, Porter, Thomas, and Carpenter, Loren, “‘Distributed Ray Tracing,” SIGGRAPH ’84 proceedings, pp. 137- 145.
    8. Watkins, Gary, “‘A real-time visible surface algorithm,” Ph.D. Thesis, University of Utah (1970) UTECH-CSc-70-101.
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    11. Blinn, James, “Light Reflection Functions for Simulation of Clouds and Dusty Surface,” SIGGRAPH ’82 proceedings, pp. 21-29.
    12. Max, Nelson, “Light Diffusion through Clouds and Haze,” Computer Vision Graphics, and Image Processing, Vol 33 (I986), pp, 280-292.
    13. Kajiya, James, and Von Herzen, Brian, “‘Ray Tracing Volume Densities,” SIGGRAPH ’84 proceedings, pp. 165-174.
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    17. Catmull, Ed, and Smith, Alvey Ray, “3-D Transformations of Images in Scanline Order,” SIGGRAPH ’80 proceedings, pp. 279-285.
    18. Max, Nelson “Anti-Aliasing Scan Line Data” to be submitted to IEEE Computer Graphics and Applications.
    19. Bloomenthal, Jules, “Modelling the Mighty Maple,” SIGGRAPH ’85 proceedings, pp. 305-311.
    20. Max, Nelson, “Shadows for Bump Mapped Surfaces,” in Advanced Computer Graphics: Proceedings of Computer Graphics Tokyo “86, T. L. Kunii, ed., Springer Verlag, Tokyo (1986), pp. 145-156. To be revised and submitted to The Visual Computer.

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