Direct manipulation of free-form deformations

“…Despite significant developments (Coquillart 3 , Hsu et al 4 , MacCracken and Joy 5 , Singh and Kokkevis 6 ), these techniques have not been used to simulate the behavior of the physical properties of virtual characters.…”

Section: Deformation Techniquesmentioning

confidence: 99%

Fast simulation of skin sliding

Yang¹,

Southern²,

Zhang

2009

Computer Animation & Virtual

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Skin sliding is the phenomenon of the skin moving over underlying layers of fat, muscle and bone. Due to the complex interconnections between these separate layers and their differing elasticity properties, it is difficult to model and expensive to compute. We present a novel method to simulate this phenomenon at real-time by remeshing the surface based on a parameter space resampling. In order to evaluate the surface parametrization, we borrow a technique from structural engineering known as the force density method which solves for an energy minimizing form with a sparse linear system. Our method creates a realistic approximation of skin sliding in real-time, reducing texture distortions in the region of the deformation. In addition it is flexible, simple to use, and can be incorporated into any animation pipeline. Abstract Skin sliding is the phenomenon of the skin moving over underlying layers of fat, muscle and bone. Due to the complex interconnections between these separate layers and their differing elasticity properties, it is difficult to model and expensive to compute. We present a novel method to simulate this phenomenon at real-time by remeshing the surface based on a parameter space resampling. In order to evaluate the surface parametrization, we borrow a technique from structural engineering known as the force density method which solves for an energy minimizing form with a sparse linear system. Our method creates a realistic approximation of skin sliding in real-time, reducing texture distortions in the region of the deformation. In addition it is flexible, simple to use, and can be incorporated into any animation pipeline.

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“…This method is closed to the simulation of standard clay modeling when the user creates an object by deforming a piece of clay with the help of his fingers. This interaction paradigm is based of the theory of deformable meshes called FreeForm Deformation (FFD) [3] [7] [13] [14]. However, this technique has shown very quickly some strong drawbacks.…”

Section: Human Computer Interface For Shape Animation and Modellingmentioning

confidence: 99%

Organic Shape Modeling through Haptic Devices

Ott¹,

Thalmann²,

Vexo³

2006

Computer-Aided Design and Applications

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This paper presents a sketching system for 3D organic shapes modeling and animation using virtual reality devices. On the hardware side, it is based on the Haptic Workstation™ which conveys force feedback on the user arms (upper body limbs), and a Head Mounted Display to present the 3D generated images. On the software side, we use implicit surfaces modelling techniques such as metaballs. In fact, Designers feel well comfortable with this kind of primitives due to their ability in the organic shapes creation such as virtual humans. The proposed system provides an efficient alternative to produce advanced 3D shapes sketching.

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Direct manipulation of free-form deformations

Cited by 273 publications

References 10 publications

Segmented-body Change driven VR Game Character Deformation with Cross Sectional Area Mapping

Segmented-body Change driven VR Game Character Deformation with Cross Sectional Area Mapping

Fast simulation of skin sliding

Organic Shape Modeling through Haptic Devices

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