Geodesic
On the Representation of Dupin Cyclides in Lie Sphere Geometry with Applications
Journal for geometry and graphics, Tome 13 (2009) no. 2, pp. 145-162 Cet article a éte moissonné depuis la source Heldermann Verlag

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Dupin cyclides are canal surfaces defined as envelopes of a family of oriented spheres which touch three given oriented spheres. With respect to their attractive geometric properties they are often used in Computer Aided Geometric Design and in many engineering applications. In this paper, we study these surfaces from the point of view of Lie sphere geometry. This representation enables to solve many complicated problems through simple and well known methods of linear algebra. As for applications, we present an algorithm for computing their rational parametrizations and demonstrate a construction of blends between two canal surfaces using methods of Lie geometry.
Classification : 51N25, 68U05
Mots-clés : Quadratic spaces, Lie sphere geometry, Dupin cyclides, rational parametrizations, PN surfaces, blending surfaces 
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     author = {M. L�vicka and J. Vrsek },
     title = {On the {Representation} of {Dupin} {Cyclides} in {Lie} {Sphere} {Geometry} with {Applications}},
     journal = {Journal for geometry and graphics},
     pages = {145--162},
     year = {2009},
     volume = {13},
     number = {2},
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M. L�vicka; J. Vrsek . On the Representation of Dupin Cyclides in Lie Sphere Geometry with Applications. Journal for geometry and graphics, Tome 13 (2009) no. 2, pp. 145-162. http://geodesic.mathdoc.fr/item/JGG_2009_13_2_JGG_2009_13_2_a1/