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Edge-orthogonal patches through a given rational Bézier curve. (English) Zbl 0920.68139
Summary: Applications in Computational Fluid Dynamics (CFD) have led to the problem of finding a rational Bézier patch with a given edge parameter line $$k$$ the way that the parameter lines of the other type intersect $$k$$ orthogonally. This is what we call an ‘orthogonal continuation of $$k$$’. The variety of solutions to the problem is being investigated and a very geometric way for the construction of the solutions is being offered. Using some fundamental features of polynomials we can establish a link between the properties of the weight polynomial and the elevation of degree which is necessary to find non-trivial orthogonal continuations. For some cases which turn out to be unsolvable, and for cases where the solution existing has a very high degree, we can describe a Monte Carlo method providing surprisingly good approximations. This method is even capable of coping with tasks where the right angle is replaced by some arbitrary angle function.
##### MSC:
 68U05 Computer graphics; computational geometry (digital and algorithmic aspects)
##### Keywords:
computational fluid dynamics
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