Step length in forward differencing for curved surface display |
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Authors: | J. J. Steketee |
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Affiliation: | (1) GEMORE, Geometric Modelling Research, Von Weberplantsoen 7, NL-3335 XL Zwijndrecht, The Netherlands |
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Abstract: | Principles and basic algorithms for evaluating polynomial functions by Forward Differencing (FD) and Adaptive Forward Differencing (AFD) are presented. Both techniques are used nowadays in scanning/display algorithms for parameteric polynomial surfaces by generating and displaying a set of points. Constraints to be put on such a set of points are made explicit. One FD and two AFD surface-scanning/display algorithms presented in literature are evaluated in terms of these constraints. The FD algorithm is proved to be valid, but the AFD algorithms are shown to be incorrect. A valid AFD algorithm is presented.This research was partially done at the Faculty of Technical Mathematics and Informations of the Delft University of Technology, Delft, The Netherlands |
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Keywords: | Scanning/display algorithm Forward differencing Parametric polynomial surface |
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