By Tor Dokken, Bert Jüttler

The papers integrated during this quantity offer an outline of the cutting-edge in approximative implicitization and diverse similar issues, together with either the theoretical foundation and the prevailing computational techniques. The novel inspiration of approximate implicitization has reinforced the prevailing hyperlink among computing device Aided Geometric layout and classical algebraic geometry. there's a growing to be curiosity from researchers and execs either in CAGD and Algebraic Geometry, to satisfy and combine wisdom and ideas, with the purpose to enhance the fixing of industrial-type demanding situations, in addition to to start up new instructions for easy learn. This quantity will help this alternate of rules among some of the groups.

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**Extra info for Computational Methods for Algebraic Spline Surfaces: ESF Exploratory Workshop **

**Sample text**

Notice that a singular point is critical for any direction of projection. If I(C) = (P1 , P2 ), then the x-critical points are the solutions of the system P1 (x, y, z) = 0, P2 (x, y, z) = 0, (∂y P1 ∂z P2 − ∂y P2 ∂z P1 )(x, y, z) = 0. (1) In the case of a planar curve defined by P (x, y) = z = 0, with P (x, y) squarefree so that I(C) = (P (x, y), z), this yields the following definitions: a point (α, β) – is singular if P (α, β) = ∂x P (α, β) = ∂y P (α, β) = 0. – is x-critical if P (α, β) = ∂y P (α, β) = 0.

Such a question is critical in many solid geometry operations, involved in the digital modeling or construction process of shapes. In the case of two parameterized surfaces, in order to reduce to such a situation, we may compute the implicit equation of one of the rational surfaces [4]. This reduces the problem of intersection to the case of an implicit and a parameterized representation, which boils down, by substitution, to the case of a curve defined by an implicit equation in the plane of parameters.

1997. 5. Dokken T. Approximate Implicitization. Mathematical Methods for Curves and Surfaces. Edited by T. Lyche and L. Schumaker (Oslo 2000) 81-102 6. Dokken T. B. Overview of Approximate Implicitization. To appear in Contemporary Mathematics (CONM) book series by AMS 7. Dokken T. Skytt V. and Ytrehus A-M. Recursive Subdivision and Iteration in Intersections. Mathematical methods in computer aided geometric design. Edited by T. Lyche and L. Schumaker. (Oslo 1989) 207-214 8. A. W. A new approach to the surface intersection problem.