Harmonic coordinates for character articulation

Joshi, Prasad; Meyer, Mark; DeRose, Tony; Green, Brian; Sanocki, Tom

doi:10.1145/1239451.1239522

Cited by 103 publications

(178 citation statements)

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“…Ju et al [12] presented a surface deformation technique based on these coordinates. Joshi et al [13] and later Lipman et al [27] presented alternative coordinates which are non-negative.…”

Section: Rotations Is the Keymentioning

confidence: 99%

Space Deformations, Surface Deformations and the Opportunities In-Between

Cohen–Or

2009

J. Comput. Sci. Technol.

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In recent years we have witnessed a large interest in surface deformation techniques. This has been a reaction that can be attributed to the ability to develop techniques which are detail-preserving. Space deformation techniques, on the other hand, received less attention, but nevertheless they have many advantages over surface-based techniques. This paper explores the potential of these two approaches to deformation and discusses the opportunities that the fusion of the two may lead to.

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“…Ju et al [12] presented a surface deformation technique based on these coordinates. Joshi et al [13] and later Lipman et al [27] presented alternative coordinates which are non-negative.…”

Section: Rotations Is the Keymentioning

confidence: 99%

Space Deformations, Surface Deformations and the Opportunities In-Between

Cohen–Or

2009

J. Comput. Sci. Technol.

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“…A common way to reduce computational cost is to build a similar but simple structure with much fewer vertices first [1][2][3][4][5] , and then manipulate the dense model through the simpler structure. Much deformation work [6][7][8][9][10][11] performed deformations with such simpler structures (2D polygons for 2D models; 3D triangular meshes for 3D models). These simple structures, which envelop the original dense models, are called cages.…”

Section: Introductionmentioning

confidence: 99%

“…According to [6,[8][9], a cage should have the following two properties: 1) enveloping the original model; 2) no self-intersections. A cage is considered better if it has fewer vertices and it is more similar to the original model.…”

Section: Introductionmentioning

confidence: 99%

Automatic Cage Building with Quadric Error Metrics

Deng

Luo

Miao

2011

J. Comput. Sci. Technol.

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Modern computer graphics applications usually require high resolution object models for realistic rendering. However, it is expensive and difficult to deform such models in real time. In order to reduce the computational cost during deformations, a dense model is often manipulated through a simplified structure, called cage, which envelops the model. However, cages are usually built interactively by users, which is tedious and time-consuming. In this paper, we introduce a novel method that can build cages automatically for both 2D polygons and 3D triangular meshes. The method consists of two steps: 1) simplifying the input model with quadric error metrics and quadratic programming to build a coarse cage; 2) removing the self-intersections of the coarse cage with Delaunay partitions. With this new method, a user can build a cage to envelop an input model either entirely or partially with the approximate vertex number the user specifies. Experimental results show that, compared to other cage building methods with the same number of vertex, cages built by our method are more similar to the input models. Thus, the dense models can be manipulated with higher accuracy through our cages.

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“…The authors in [27] introduced the concept of control polyhedron and others refined it later [18,22]. It is well recognized that a control polyhedron does not provide sufficient flexibility to deform meshes with complicated topology and geometry [15,21]. More recent techniques increase this flexibility by introducing sophisticated coordinate functions that bind the cage to the mesh.…”

mentioning

confidence: 99%

“…Early attempts include extending the notion of barycentric coordinates to polyhedra [16,23,31]. More recently, Mean Value Coordinates [10,11,19], Harmonic [15], and Green [21] Coordinates have been proposed for the purpose. The au- Fig.…”

mentioning

confidence: 99%

Eigen deformation of 3D models

2012

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Recent advances in mesh deformations have been dominated by two techniques: one uses an intermediate structure like a cage which transfers the user intended moves to the mesh, the other lets the user to impart the moves to the mesh directly. The former one lets the user deform the model in real-time and also preserve the shape with sophisticated techniques like Green Coordinates. The direct techniques on the other hand free the user from the burden of creating an appropriate cage though they take more computing time to solve larger non-linear optimizations. It would be ideal to develop a cage-free technique that provides real-time deformation while respecting the local geometry. Using a simple eigen-framework, we devise such a technique. Our framework creates an implicit skeleton automatically. The user only specifies the motion in a simple and intuitive manner, and our algorithm computes a deformation whose quality is similar to that of the cage-based scheme with Green Coordinates.

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Harmonic coordinates for character articulation

Cited by 103 publications

References 0 publications

Space Deformations, Surface Deformations and the Opportunities In-Between

Space Deformations, Surface Deformations and the Opportunities In-Between

Automatic Cage Building with Quadric Error Metrics

Eigen deformation of 3D models

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