Mesh generator for and method of generating meshes in an...

G - Physics – 06 – T

Patent

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G06T 17/20 (2006.01) G06F 17/50 (2006.01)

Patent

CA 2395809

A computer arrangement and a method for generating meshes of an object having an object volume within a shape defined by a front surface (59), a rear surface (59') and an envelope surface (65) in accordance with the following steps: (a) receiving input data regarding a set of line sections (25(n)); (b) defining a circle with a radius Lcirc just large enough to enclose an outer contour of a front surface cross-section; (c) dividing each of the line sections (25(n)) into a number of consecutive line elements connected by nodes (17) in accordance with equation: (1), where: nel(n)=number of line elements of line section 25(n), Lsect(n)=length of line section 25(n), c1, c2=predetermined constants; (d) generating front surface meshes; (e) copying the front surface meshes to the rear surface (59'); (f) generating envelop surface meshes for the envelop surface (65); (g) generating a volume mesh for the object volume.

La présente invention concerne un appareil informatique et un procédé de génération de treillis d'un objet présentant un volume dont la forme est définie par une surface avant (59), une surface arrière (59') et une surface enveloppante (65). Ce procédé consiste à; (a) recevoir des données d'entrée relatives à un ensemble de segments de ligne (25(n)); (b) définir un cercle avec un rayon L¿circ? suffisamment large pour entourer un contour extérieur d'une coupe de la surface avant; (c) diviser chacun des segments de ligne (25(n)) en un certain nombre d'éléments de ligne consécutifs reliés par des noeuds (17) selon l'équation (1), dans laquelle: n¿el?(n)=nombre d'éléments de ligne du segment de ligne 25(n), L¿sect?(n)=longueur du segment de ligne 25(n), c¿1?, c¿2?= constantes prédéterminées, (d) générer des treillis de surface avant; (e) copier les treillis de surface avant sur la surface arrière (59'); (f) générer des treillis de surface enveloppante pour la surface enveloppante (65); et enfin, (g) générer un treillis à volume pour le volume de l'objet.

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