Pub Date : 2002-05-17DOI: 10.1109/SMI.2002.1003535
R. Durikovic, S. Czanner
The embryologists found realistic human organ models and animations of development necessary for their studies. The aim of this paper is to present a methodology producing realistic animations of development. The convolution surfaces generated by skeletons used for model representation are suitable for growth animation. The skeleton of a digestive system is a line skeleton with a tree structure. Therefore, its growth in length can be simulated by an algebraic L-system which controls the growth of skeleton segments. The global deformation of the skeleton due to the gravity and the lack of space in the abdominal cavity are simulated by a dynamics of skeleton segments. The known movements are implemented in our model by external forces applied on links controlling the organ movement in space. The entire system consist of two steps: First, the actual number of skeleton segments and the length of each skeleton segment is calculated from growth functions, second, the skeleton deformation in space is updated based on dynamics.
{"title":"Implicit surfaces for dynamic growth of digestive system","authors":"R. Durikovic, S. Czanner","doi":"10.1109/SMI.2002.1003535","DOIUrl":"https://doi.org/10.1109/SMI.2002.1003535","url":null,"abstract":"The embryologists found realistic human organ models and animations of development necessary for their studies. The aim of this paper is to present a methodology producing realistic animations of development. The convolution surfaces generated by skeletons used for model representation are suitable for growth animation. The skeleton of a digestive system is a line skeleton with a tree structure. Therefore, its growth in length can be simulated by an algebraic L-system which controls the growth of skeleton segments. The global deformation of the skeleton due to the gravity and the lack of space in the abdominal cavity are simulated by a dynamics of skeleton segments. The known movements are implemented in our model by external forces applied on links controlling the organ movement in space. The entire system consist of two steps: First, the actual number of skeleton segments and the length of each skeleton segment is calculated from growth functions, second, the skeleton deformation in space is updated based on dynamics.","PeriodicalId":267347,"journal":{"name":"Proceedings SMI. Shape Modeling International 2002","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134275656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-05-17DOI: 10.1109/SMI.2002.1003532
E. Danovaro, L. Floriani, M. Lee, H. Samet
We deal with the problem of analyzing and visualizing large-size volume data sets. To this aim, we consider multiresolution representations based on a decomposition of the field domain into tetrahedral cells. We compare two types of multiresolution representations that differ on the rule applied to refine an initial coarse mesh: one is based on tetrahedron bisection, and one based on vertex split. The two representations can be viewed as instances of a common multiresolution model, that we call a multiresolution mesh. Encoding data structures for the two representations are briefly described. An experimental comparison on structured volume data sets is presented.
{"title":"Multiresolution tetrahedral meshes: an analysis and a comparison","authors":"E. Danovaro, L. Floriani, M. Lee, H. Samet","doi":"10.1109/SMI.2002.1003532","DOIUrl":"https://doi.org/10.1109/SMI.2002.1003532","url":null,"abstract":"We deal with the problem of analyzing and visualizing large-size volume data sets. To this aim, we consider multiresolution representations based on a decomposition of the field domain into tetrahedral cells. We compare two types of multiresolution representations that differ on the rule applied to refine an initial coarse mesh: one is based on tetrahedron bisection, and one based on vertex split. The two representations can be viewed as instances of a common multiresolution model, that we call a multiresolution mesh. Encoding data structures for the two representations are briefly described. An experimental comparison on structured volume data sets is presented.","PeriodicalId":267347,"journal":{"name":"Proceedings SMI. Shape Modeling International 2002","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127261082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-05-17DOI: 10.1109/SMI.2002.1003524
G. Salomon, A. Leclercq, S. Akkouche, Eric Galin
This paper presents simple and efficient deformation methods based on a new class of interpolating N-adic subdivision algorithms. Our N-adic scheme is a natural extension of a standard dyadic scheme-each face of the mesh is more generally divided into N/sup 2/ sub-faces-and geometric properties are similar. This framework enables us to locally deform the surface using different tools by either modifying the direction of normals at the vertices of the control mesh, or twisting them. Experiments show that the N-adic decomposition provides a more accurate control over deformations, and proves to be a good alternative to dyadic decompositions.
{"title":"Normal control using N-adic subdivision schemes","authors":"G. Salomon, A. Leclercq, S. Akkouche, Eric Galin","doi":"10.1109/SMI.2002.1003524","DOIUrl":"https://doi.org/10.1109/SMI.2002.1003524","url":null,"abstract":"This paper presents simple and efficient deformation methods based on a new class of interpolating N-adic subdivision algorithms. Our N-adic scheme is a natural extension of a standard dyadic scheme-each face of the mesh is more generally divided into N/sup 2/ sub-faces-and geometric properties are similar. This framework enables us to locally deform the surface using different tools by either modifying the direction of normals at the vertices of the control mesh, or twisting them. Experiments show that the N-adic decomposition provides a more accurate control over deformations, and proves to be a good alternative to dyadic decompositions.","PeriodicalId":267347,"journal":{"name":"Proceedings SMI. Shape Modeling International 2002","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125949764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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