Lecture

Conicity in Modeling

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In course

AR-211: Stereotomy

La Stéréotomie est l'art de concevoir et fabriquer des volumes complexes en pierre et des assemblages en bois. Ce cours propose une réinterprétation de la Stéréotomie avec différents outils, une réflexion sur la géométrie, les processus de fabrication, les ...

Description

This lecture delves into conicity as a powerful tool in modeling, showcasing how it deforms shapes while preserving all planes, addressing challenges at corners, and simplifying geometry. By imposing conicity at vertices, the lecture explores the concept of tangency to cones and the convergence of bisectors, ultimately leading to a clearer understanding of geometric structures. The instructor demonstrates how conicity affects the convergence of joint planes, streamlining the geometry of walls. Through a tutorial, viewers learn to create a circumscribed circle that forms the basis of a fully convex cone, ensuring convexity in all facets. The lecture concludes by hinting at upcoming discussions on elliptical, parabolic, and hyperbolic cases of conicity.

Instructors (5)

Marie-Pierre Zufferey

Diplôme d'Architecture à l'EPFL en 1988 (prix SIA, section Vaud, du meilleur travail pratique de diplôme). Collaboration avec plusieurs bureaux d'architecture et, en parallèle, rédaction d'une thèse de doctorat suivie de l'obtention en 1992 du titre de Docteur ès Sciences. Bureau indépendant de 1996 à 2008; enseignement dans plusieurs écoles (dessin technique, peinture, couleurs). De 1999 à 2004, première assistante chez les professeurs Arduino Cantàfora (CRE) et Georges Abou Jaoudé (LIV, cours théorique, visualisation et représentation informatique). De 2005 à 2011, collaboratrice scientifique et chargée de cours auprès du professeur A. Cantàfora (CRE, chaire de représentation et expression) : enseignement pratique du dessin, peinture, et taille de la pierre, et théorique, analyse d'images, techniques de représentation, modes de communication, auprès des étudiants d'architecture de différents niveaux; rédaction de documentation pédagogique (cahiers d'appui des cours). Charge de cours pour une Unité d'Enseignement ENAC intitulée "Lectures du paysage par le biais de l'image et de l'art" avec Robert Ireland de 2006 à 2008. Responsable d'une nouvelle Unité d'Enseignement ENAC sur "les murs de soutènement urbains", printemps 2009 et 2010, avec O. Burdet, A. Parriaux, J-L. Moret. Participation ponctuelle en 2011, 2013 et 2014, pour l'UE-ENAC "Learning from vernacular", du professeur Pierre Frey sur la pierre et les traces de la main dans l'architecture vernaculaire. Recherche personnelle en cours sur les socles à la Renaissance italienne et française, en lien avec les professeurs Volker Hoffmann (Würzburg) et Roberto Gargiani (EPFL). Domaines d'intérêt spécifique: l'architecture à la Renaissance; la taille de la pierre et la stéréotomie; le dessin d'observation scientifique, la peinture et la gravure; la philosophie.

Bernard Cache

Sebastian Duque Mahecha

Teaching & PhD Courses Stereotomy AR-211 Stereotomy is the art of designing and crafting complex stone volumes and wooden assemblies. This course offers a reinterpretation of Stereotomy with various tools, a reflection on geometry, manufacturing processes, modes of representation, visualization, and communication.

Ignacio Ferrer Perez-Blanco

Official source

Ontological neighbourhood

Mathematics

Geometry: Euclidean geometry

Related concepts (32)

Elliptic geometry

Elliptic geometry is an example of a geometry in which Euclid's parallel postulate does not hold. Instead, as in spherical geometry, there are no parallel lines since any two lines must intersect. However, unlike in spherical geometry, two lines are usually assumed to intersect at a single point (rather than two). Because of this, the elliptic geometry described in this article is sometimes referred to as single elliptic geometry whereas spherical geometry is sometimes referred to as double elliptic geometry.

Hyperbolic geometry

In mathematics, hyperbolic geometry (also called Lobachevskian geometry or Bolyai–Lobachevskian geometry) is a non-Euclidean geometry. The parallel postulate of Euclidean geometry is replaced with: For any given line R and point P not on R, in the plane containing both line R and point P there are at least two distinct lines through P that do not intersect R. (Compare the above with Playfair's axiom, the modern version of Euclid's parallel postulate.) The hyperbolic plane is a plane where every point is a saddle point.

Geometry

Geometry (; ) is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician who works in the field of geometry is called a geometer. Until the 19th century, geometry was almost exclusively devoted to Euclidean geometry, which includes the notions of point, line, plane, distance, angle, surface, and curve, as fundamental concepts.

Cone

A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex. A cone is formed by a set of line segments, half-lines, or lines connecting a common point, the apex, to all of the points on a base that is in a plane that does not contain the apex. Depending on the author, the base may be restricted to be a circle, any one-dimensional quadratic form in the plane, any closed one-dimensional figure, or any of the above plus all the enclosed points.

Circumscribed sphere

In geometry, a circumscribed sphere of a polyhedron is a sphere that contains the polyhedron and touches each of the polyhedron's vertices. The word circumsphere is sometimes used to mean the same thing, by analogy with the term circumcircle. As in the case of two-dimensional circumscribed circles (circumcircles), the radius of a sphere circumscribed around a polyhedron P is called the circumradius of P, and the center point of this sphere is called the circumcenter of P.

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