This paper consists of two parts. In the first an interrogation method for
a visualization of the curvature behavior is introduced. The method consists
of a generalized focal analysis. The second part concerns the accurate
computation of surface behavior.
Arithmetic operations on Bézier surfaces are used to achieve an exact
representation of surface properties. With these property surfaces
in Bézier form qualitative and quantitative statements with respect to
the investigation surface are possible.
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