A Generalization of Algebraic Surface Drawing
ACM Transactions on Graphics (TOG)
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Ray tracing objects defined by sweeping planar cubic splines
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Ray tracing generalized cylinders
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Ray tracing parametric surface patches utilizing numerical techniques and ray coherence
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Technical Section: Progressive refinement rendering of implicit surfaces
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Technical Section: Real-time ray casting of algebraic B-spline surfaces
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Many interesting surfaces can be written as polynomial functions of the spatial coordinates, often of low degree. We present a method based on a ray casting algorithm, extended to work in more than three dimensions, to produce pictures of these surfaces. The method uses a symbolic algebra system to automatically derive the equation of intersection between the ray and the surface and then solves this equation using an exact polynomial root finding algorithm. Included are illustrations of the cusp catastrophe surface, and two unusually shaped quartic surfaces, Kummer's quadruple and Steiner's surface.