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Extension of Wu-Peters bounds to Catmull-Clark and 4-8 subdivisionZhe, Wu 03 1900 (has links)
La méthode de subdivision Catmull-Clark ainsi que la méthode de subdivision Loop sont des normes industrielle de facto. D'autre part, la méthode de subdivision 4-8 est bien adaptée à la subdivision adaptative, parce que cette méthode augmente le nombre de faces ou de sommets par seulement un facteur de 2 à chaque raffinement. Cela promet d'être plus pratique pour atteindre un niveau donné de précision. Dans ce mémoire, nous présenterons une méthode permettant de paramétrer des surfaces de subdivision de la méthode Catmull-Clark et de la méthode 4-8. Par conséquent, de nombreux algorithmes mis au point pour des surfaces paramétriques pourrant être appliqués aux surfaces de subdivision Catmull-Clark et aux surfaces de subdivision 4-8. En particulier, nous pouvons calculer des bornes garanties et réalistes sur les patches, un peu comme les bornes correspondantes données par Wu-Peters pour la méthode de subdivision Loop. / The Catmull-Clark and Loop methods are de facto industry standards. On the other
hand, the 4-8 subdivision method is well suited for adaptive subdivision, because this
method increases the number of faces or vertices by only a factor of 2 at each step. It
is therefore more convenient when trying to achieve a given practical level of precision.
In this thesis we will introduce a method to parametrize the subdivision surfaces
of Catmull-Clark and 4-8 subdivision. As a consequence, many algorithms developed
for parametric surfaces will be able to be applied to Catmull-Clark and 4-8 subdivision
surfaces. In particular, we can produce bounds on surface patches which are both
guaranteed and realistic, similar to the bounds given by Wu-Peters [24] for the Loop
method
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[en] AN EFFICIENT SOLUTION FOR TRIANGULAR MESH SUBDIVISION / [pt] UMA SOLUÇÃO EFICIENTE PARA SUBDIVISÃO DE MALHAS TRIANGULARESJEFERSON ROMULO PEREIRA COELHO 12 January 2015 (has links)
[pt] Subdivisão de superfícies triangulares é um problema importante nas
atividades de modelagem e animação. Ao deformar uma superfície a qualidade
da triangulação pode ser bastante prejudicada na medida em que triângulos,
antes equiláteros, se tornam alongados. Uma solução para este problema consiste
em refinar a região deformada. As técnicas de refinamento requerem uma
estrutura de dados topológica que seja eficiente em termos de memória e tempo
de consulta, além de serem facilmente armazenadas em memória secundária.
Esta dissertação propõe um framework baseado na estrutura Corner Table com
suporte para subdivisão de malhas triangulares. O framework proposto foi
implementado numa biblioteca C mais mais de forma a dar suporte a um conjunto de
testes que comprovam a eficiência pretendida. / [en] Subdivision of triangular surfaces is an important problem in modeling and
animation activities. Deforming a surface can be greatly affected the quality of
the triangulation when as equilateral triangles become elongated. One solution
to this problem is to refine the deformed region. Refinement techniques require
the support of topological data structure. These structures must be efficient in
terms of memory and time. An additional requirement is that these structures
must also be easily stored in secondary memory. This dissertation proposes a
framework based on the Corner Table data structure with support for subdivision
of triangular meshes. The proposed framework was implemented in a C plus plus
library. With this library this work presents a set of test results that demonstrate
the desired efficiency.
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Extension of Wu-Peters bounds to Catmull-Clark and 4-8 subdivisionZhe, Wu 03 1900 (has links)
La méthode de subdivision Catmull-Clark ainsi que la méthode de subdivision Loop sont des normes industrielle de facto. D'autre part, la méthode de subdivision 4-8 est bien adaptée à la subdivision adaptative, parce que cette méthode augmente le nombre de faces ou de sommets par seulement un facteur de 2 à chaque raffinement. Cela promet d'être plus pratique pour atteindre un niveau donné de précision. Dans ce mémoire, nous présenterons une méthode permettant de paramétrer des surfaces de subdivision de la méthode Catmull-Clark et de la méthode 4-8. Par conséquent, de nombreux algorithmes mis au point pour des surfaces paramétriques pourrant être appliqués aux surfaces de subdivision Catmull-Clark et aux surfaces de subdivision 4-8. En particulier, nous pouvons calculer des bornes garanties et réalistes sur les patches, un peu comme les bornes correspondantes données par Wu-Peters pour la méthode de subdivision Loop. / The Catmull-Clark and Loop methods are de facto industry standards. On the other
hand, the 4-8 subdivision method is well suited for adaptive subdivision, because this
method increases the number of faces or vertices by only a factor of 2 at each step. It
is therefore more convenient when trying to achieve a given practical level of precision.
In this thesis we will introduce a method to parametrize the subdivision surfaces
of Catmull-Clark and 4-8 subdivision. As a consequence, many algorithms developed
for parametric surfaces will be able to be applied to Catmull-Clark and 4-8 subdivision
surfaces. In particular, we can produce bounds on surface patches which are both
guaranteed and realistic, similar to the bounds given by Wu-Peters [24] for the Loop
method
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