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Algorithms for reflecting rays from general topographic surfaces in a ray tracing program
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1982
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By Jones, R. M.
[PDF-88.51 MB]
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Description:Algorithms for reflecting rays from general terrain models are presented. They enable a programmer to translate flow charts into computer program subroutines for three-dimensional raytracing computer programs that calculate ray paths by numerical integration of Hamilton’s equations. The surface of the terrain can be expressed either by giving height as a function of longitude and latitude or as a function of the form f(r, 0,
) = 0, where r, 0, and (j) are earth-centered spherical polar coordinates. In either case, the terrain model must specify partial derivatives of the function including second derivatives, and all specified derivatives must be continuous functions of the arguments. -
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Rights Information:CC0 Public Domain
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