Seminars

A new paradigm for geometric modeling: Pythagorean Hodograph (PH) B-Spline curves

Speaker: Gudrun Albrecht
Affiliation: National University of Colombia
When: Tuesday 31st July 2018
Time: 14:00:00
Abstract: We introduce the new class of planar Pythagorean-Hodograph (PH) BSpline curves. They can be seen as a generalization of the well-known class of planar Pythagorean-Hodograph (PH) Bézier curves, presented by R. Farouki and T. Sakkalis in 1990, including the latter ones as special cases. Pythagorean-Hodograph BSpline curves are nonuniform parametric BSpline curves whose arc-length is a BSpline function as well. An important consequence of this special property is that the offsets of Pythagorean-Hodograph BSpline curves are non-uniform rational BSpline (NURBS) curves. Thus, although Pythagorean-Hodograph BSpline curves have fewer degrees of freedom than general BSpline curves of the same degree, they offer unique advantages for computer-aided design and manufacturing, robotics, motion control, path planning, computer graphics, animation, and related fields. After providing a general definition for this new class of planar parametric curves, we ! present useful formulae for their construction and discuss their remarkable attractive properties. Then we provide a method to determine within the set of all PH BSplines the one that is closest to a given reference spline having the same degree and knot partition. Contact franca.calio@polimi.it