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General constrained deformations based on generalized metaballs

Xiaogang Jin, Youfu Li, Qunsheng Peng
2000 Computers & graphics  
Space deformation is an important tool in computer animation and shape design. In this paper we present a new local deformation model based on generalized metaballs.  ...  The deformation can be "nely controlled by adjusting the parameters of the generalized metaballs.  ...  We de"ne tuple M"1S, f (r, R)2 as a generalized metaball based on skeleton C. A general constrained deformation model based on generalized metaballs can then be de"ned.  ... 
doi:10.1016/s0097-8493(99)00156-9 fatcat:3vyxa6b3yrdz3fukwra2cemj6i

General constrained deformations based on generalized metaballs

Xiaogang Jinq, Y.F. Li, Qunsheng Peng
Proceedings Pacific Graphics '98. Sixth Pacific Conference on Computer Graphics and Applications (Cat. No.98EX208)  
Space deformation is an important tool in computer animation and shape design. In this paper we propose a new local deformation model based on generalized metaballs.  ...  Each generalized metaball is associated with a potential function centered on the constraint, the potential function drops from 1 on the constraint to 0 on the effective radius.  ...  Constrained Local Deformation Based on Generalized Metaballs Metaball modeling is regarded as a flexible technique for implicit surface modeling.  ... 
doi:10.1109/pccga.1998.732061 dblp:conf/pg/JinLP98 fatcat:45mgtbuiz5bp5nayct24evkepe

Organic Shape Modeling through Haptic Devices

Renaud Ott, Daniel Thalmann, Frédéric Vexo
2006 Computer-Aided Design and Applications  
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 [8] , we had already proposed a solution based on a Cyberglove™ used to do generic mesh deformations for the creation of virtual human faces.  ... 
doi:10.1080/16864360.2006.10738444 fatcat:ssepagnlcrgtbdzbnhs3k56klq

The making of the Xian terra‐cotta soldiers

Nadia Magnenat Thalmann, Igor Sunday Pandzic, Jean‐Claude Moussaly
1997 Digital Creativity  
Then, we show how our approach based on metaballs and spline surfaces was used for designing and deforming soldiers' bodies. For the animation of the bodies, we describe the motion control methods.  ...  This paper describes the making of a short film on the Xian terra-cotta soldiers using our integrated HUMANOID software. The method of creating and animating the soldiers' faces is first presented.  ...  The chosen material constrains the type of treatment.  ... 
doi:10.1080/09579139708567076 fatcat:iclei4fi7jdffny55xkpzbggla

Using the CW-complex to represent the topological structure of implicit surfaces and solids

John C. Hart
2005 ACM SIGGRAPH 2005 Courses on - SIGGRAPH '05  
Previous methods for contolling the blending of implicit surfaces redefined the contribution of a metaball or unioned blended components.  ...  The author is grateful to fellow faculty members Ulrike Axen for discussions on the CW-complex and locating otherwise obscure references, and Bob Lewis for discussions on applications of computational  ...  the effect on metaball of A similar range deformation occurs on metaball The resulting implicit surfaces of and may touch but can not interpenetrate, for if any point Ü we have ´Üµ ¼ then ´Üµ ´Üµ and  ... 
doi:10.1145/1198555.1198643 dblp:conf/siggraph/Hart05a fatcat:ur2s4dy3pbfydcxzom3adcb4xq

Modeling for Deformable Body and Motion Analysis: A Review

Hailang Pan, Hongwen Huo, Guoqin Cui, Shengyong Chen
2013 Mathematical Problems in Engineering  
Then, typical human modeling technologies, including 2D model, 3D surface model, and geometry-based, physics-based, and anatomy-based approaches, and model-based motion analysis are summarized.  ...  This paper surveys the modeling methods for deformable human body and motion analysis in the recent 30 years. First, elementary knowledge of human expression and modeling is introduced.  ...  Their methods based on a combination of metaballs and splines could be applied to frame-by-frame computer generated films and virtual environments.  ... 
doi:10.1155/2013/786749 fatcat:ggek74i34jdzfhf7jay7gspldy

On Implicit Modeling for Fitting Purposes [chapter]

Ralf Plänkers, Pascal Fua
2001 Deformable Avatars  
(eds.), Deformable Avatars  ...  In this paper, we propose a model based 3-D approach to recovering both body shape and motion. It takes advantage of a sophisticated animation model to achieve both robustness and realism.  ...  Each one generates a potential field and the skin is taken to be an isosurface of the combined potential (Thalmann et al. , 1996) .  ... 
doi:10.1007/978-0-306-47002-8_10 fatcat:lch5trbkqfbkdhud5yocgwq2sq

The HUMANOID Environment for Interactive Animation of Multiple Deformable Human Characters

R. Boulic, T. Capin, Z. Huang, P. Kalra, B. Lintermann, N. Magnenat-Thalmann, L. Moccozet, T. Molet, I. Pandzic, K. Saar, A. Schmitt, J. Shen (+1 others)
1995 Computer graphics forum (Print)  
We present the design of the system and the integration of the various features: generic modeling of a large class of entities with the BODY data structure, realistic skin deformation for body and hands  ...  We describe the HUMANOID environment dedicated to human modeling and animation for general multimedia, VR, and CAD applications integrating virtual humans.  ...  For the deformations module on the parallel computer, we selected as an atomic task, the generation and intersection of the rays with the list of metaballs corresponding to a body part.  ... 
doi:10.1111/j.1467-8659.1995.cgf143_0337.x fatcat:vo25ea5gczgrvpdooudhpyvnma

The HUMANOID Environment for Interactive Animation of Multiple Deformable Human Characters

R. Boulic, T. Capin, Z. Huang, P. Kalra, B. Lintermann, N. Magnenat-Thalmann, L. Moccozet, T. Molet, I. Pandzic, K. Saar, A. Schmitt, J. Shen (+1 others)
1995 Computer graphics forum (Print)  
We present the design of the system and the integration of the various features: generic modeling of a large class of entities with the BODY data structure, realistic skin deformation for body and hands  ...  We describe the HUMANOID environment dedicated to human modeling and animation for general multimedia, VR, and CAD applications integrating virtual humans.  ...  For the deformations module on the parallel computer, we selected as an atomic task, the generation and intersection of the rays with the list of metaballs corresponding to a body part.  ... 
doi:10.1111/1467-8659.1430337 fatcat:u5duy7s5cfa7bntslgavkkqlbm

Articulated soft objects for multiview shape and motion capture

R. Plankers, P. Fua
2003 IEEE Transactions on Pattern Analysis and Machine Intelligence  
Our method is both robust and generic.  ...  We develop a framework for 3-D shape and motion recovery of articulated deformable objects.  ...  Our approach relies on optimization to deform the generic model so that it conforms to the image data.  ... 
doi:10.1109/tpami.2003.1227995 fatcat:my4tyn2dvbh6vk5qe4fcnesllu

Model-Based Silhouette Extraction for Accurate People Tracking [chapter]

Ralf Plaenkers, Pascal Fua
2002 Lecture Notes in Computer Science  
To this end, we extend a purely stereo-based approach to tracking people proposed in earlier work. This approach is based on an implicit surface model of the body.  ...  In this work, we introduce a model-based approach to extracting the silhouette of people in motion from stereo video sequences.  ...  Metaballs Metaballs [2] are generalized algebraic surfaces that are defined by a summation over n 3-dimensional Gaussian density distributions, each called a primitive.  ... 
doi:10.1007/3-540-47967-8_22 fatcat:ianf5mhwtjahhoi7owylx4cx5u

Context-Preserving Volumetric Data Set Exploration Using a 3D Painting Metaphor [chapter]

L. Faynshteyn, T. McInerney
2012 Lecture Notes in Computer Science  
It combines a Maximum Intensity Difference Accumulation (MIDA) visualization algorithm with a 3D interaction model based on a painting metaphor.  ...  Another way of dealing with the problem of occlusion is based on the idea of physically removing the occluding parts of the volume or deforming parts of the volume in such a way as to make the features  ...  This type of brush is based on a superquadric metaball (as opposed to a regular quadric metaball) to define cylinder-shaped brushes that are used to paint envelopes that more closely conform to the shape  ... 
doi:10.1007/978-3-642-33179-4_33 fatcat:lgagogg6rjfbtc2aktefl4wofa

Integrating deformations between bodies and clothes

Fr�d�ric Cordier, Pascal Volino, Nadia Magnenat-Thalmann
2001 Journal of Visualization and Computer Animation  
In general, the skin is considered as a rigid surface on which the clothes have no effect. We propose in this paper a unified approach for cloth and body deformation.  ...  The skin deformation model is a hybrid model, where deformation due to the skeleton motion is controlled geometrically, and where the collision response is handled by a physical-based model.  ...  We handle collision constraints using cinematic correction on the constrained elements.  ... 
doi:10.1002/vis.243 fatcat:m35gaykunbf6xgg6hfc7ifutcy

A dynamic active constraints approach for hands-on robotic surgery

Joshua G. Petersen, Ferdinando Rodriguez Baena
2013 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems  
the robot to lie on the zero set of the generated time-varying implicit function for which the motion is either known or unknown.  ...  The computer graphics technique of metaballs is used to represent point cloud data from an imaging system with an analytical, differentiable surface and a dynamics-based controller is proposed which controls  ...  Two methods were tested; one based on the current position of the tissue and one based on a future prediction of its position.  ... 
doi:10.1109/iros.2013.6696617 dblp:conf/iros/PetersenB13 fatcat:7dhkbnnrnvb3rpsajqmfkqqch4

Semi-Immersive 3D Sketching of Vascular Structures for Medical Education [article]

Patrick Saalfeld, Aleksandar Stojnic, Bernhard Preim, Steffen Oeltze-Jafra
2016 Eurographics Workshop on Visual Computing for Biomedicine  
To create a surface model based on the sketched centerlines, we employ implicit surfaces.  ...  Our framework comprises on-the-fly reconstruction of the corresponding vessel surface and subsequent local surface compression and expansion.  ...  [SOB * 07], they generated the surface based on the boundary voxels of a segmentation mask.  ... 
doi:10.2312/vcbm.20161280 dblp:conf/vcbm/SaalfeldSPO16 fatcat:rjxyzxtupfb2digv4ud3texwlq
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