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Automatic Surface Reconstruction From Point Sets in Space
 Computer Graphics Forum
, 2000
"... In this paper an algorithm is proposed that takes as input a generic set of unorganized points, sampled on a real object, and returns a closed interpolating surface. Specifically, this method generates a closed 2manifold surface made of triangular faces, without limitations on the shape or genus of ..."
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Cited by 38 (5 self)
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In this paper an algorithm is proposed that takes as input a generic set of unorganized points, sampled on a real object, and returns a closed interpolating surface. Specifically, this method generates a closed 2manifold surface made of triangular faces, without limitations on the shape or genus of the original solid. The reconstruction method is based on generation of the Delaunay tetrahedralization of the point set, followed by a sculpturing process constrained to particular criteria. The main applications of this tool are in medical analysis and in reverse engineering areas. It is possible, for example, to reconstruct anatomical parts starting from surveys based on TACs or magnetic resonance.
Sliverfree Three Dimensional Delaunay Mesh Generation
 PH.D THESIS, UIUC
, 2000
"... A key step in the nite element method is to generate wellshaped meshes in 3D. A mesh is wellshaped if every tetrahedron element has a small aspect ratio. It is an old outstanding problem to generate wellshaped Delaunay meshes in three or more dimensions. Existing algorithms do not completely solv ..."
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Cited by 11 (4 self)
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A key step in the nite element method is to generate wellshaped meshes in 3D. A mesh is wellshaped if every tetrahedron element has a small aspect ratio. It is an old outstanding problem to generate wellshaped Delaunay meshes in three or more dimensions. Existing algorithms do not completely solve this problem, primarily because they can not eliminate all slivers. A sliver is a tetrahedron whose vertices are almost coplanar and whose circumradius is not much larger than its shortest edge length. We present two new algorithms to generate sliverfree Delaunay meshes. The rst algorithm locally moves the vertices of an almostgood mesh, whose tetrahedra have small circumradius to shortest edge length ratio. We show that the Delaunay triangulation of the perturbed mesh vertices is still almost good. Furthermore, most slivers disappear after a mild perturbation of the mesh vertices. The remaining slivers migrate to the boundary where they can be peeled o or can be treated with boundary enforcement heuristics. The second algorithm adds points to generate wellshaped meshes. It is based on the following observations. Any tetrahedron will disappear from the Delaunay triangulation if a point is added inside the circumsphere of the tetrahedron. Among the tetrahedra created by
Efficient node overlap removal using a proximity stress model
 In 16th Symp. on Graph Drawing (GD
, 2008
"... Abstract. When drawing graphs whose nodes contain text or graphics, the nontrivial node sizes must be taken into account, either as part of the initial layout or as a postprocessing step. The core problem is to avoid overlaps while retaining the structural information inherent in a layout using li ..."
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Cited by 10 (5 self)
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Abstract. When drawing graphs whose nodes contain text or graphics, the nontrivial node sizes must be taken into account, either as part of the initial layout or as a postprocessing step. The core problem is to avoid overlaps while retaining the structural information inherent in a layout using little additional area. This paper presents a new node overlap removal algorithm that does well by these measures. 1
Anisotropic Mesh Generation with Particles
, 1996
"... Many important realworld problems require meshing, that is the approximation of a given geometry by a set of simpler elements such as triangles or quadrilaterals in two dimensions, and tetrahedra or hexahedra in three dimensions. Applications include finite element analysis and computer graphics. T ..."
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Cited by 9 (1 self)
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Many important realworld problems require meshing, that is the approximation of a given geometry by a set of simpler elements such as triangles or quadrilaterals in two dimensions, and tetrahedra or hexahedra in three dimensions. Applications include finite element analysis and computer graphics. This work focuses on the former. A physicallybased model of interacting "particles" is introduced to uniformly spread points over a 2dimensional polygonal domain. The set of points is triangulated to form a triangle mesh. Delaunay triangulation is used because it guarantees a low computational cost and reasonably wellshaped elements. Several particle interaction (repulsion and attraction) models are investigated ranging from Gaussian energy potentials to Laplacian smoothing. Particle population control mechanisms are introduced to make the size of the mesh elements converge to the desired size. In most applications spatial mesh adaptivity is desirable. Triangles should not only adapt in si...
A New Vision of Fractal Geometry with Triangulation Algorithm
"... Abstract—Lsystem is a tool commonly used for modeling and simulating the growth of fractal plants. The aim of this paper is to join some problems of the computational geometry with the fractal geometry by using the Lsystem technique to generate fractal plant in 3D. Lsystem constructs the fractal ..."
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Abstract—Lsystem is a tool commonly used for modeling and simulating the growth of fractal plants. The aim of this paper is to join some problems of the computational geometry with the fractal geometry by using the Lsystem technique to generate fractal plant in 3D. Lsystem constructs the fractal structure by applying rewriting rules sequentially and this technique depends on recursion process with large number of iterations to get different shapes of 3D fractal plants. Instead, it was reiterated a specific number of iterations up to three iterations. The vertices generated from the last stage of the Lsystem rewriting process are used as input to the triangulation algorithm to construct the triangulation shape of these vertices. The resulting shapes can be used as covers for the architectural objects and in different computer graphics fields. The paper presents a gallery of triangulation forms which application in architecture creates an alternative for domes and other traditional types of roofs. Keywords—Computational geometry, Fractal geometry, Lsystem, Triangulation.
International Journal of Computing, SPECAL ISSUE: Intelligent Data Acquisition and Advanced Computing Systems, 7(2):pp.7383 Mobile Robot Localization using WLAN Signal Strengths
"... Abstract—Many buildings are already equipped with a WLAN infrastructure, as an inexpensive communication technology. In this paper two methods that estimate the position and the heading (pose) of a mobile robot using WLAN technology are described. The proposed techniques for localizing a mobile robo ..."
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Abstract—Many buildings are already equipped with a WLAN infrastructure, as an inexpensive communication technology. In this paper two methods that estimate the position and the heading (pose) of a mobile robot using WLAN technology are described. The proposed techniques for localizing a mobile robot are based on the use of received signal strength values of WLAN access points in range. Both use a radio map based method. For interpolation of the radio map weigthed Euclidean distance and Euclidean distance in combination with Delaunay triangulation is proposed. Measured signal strength values of an omnidirectional antenna and a beam antenna are compared with the values of a radio map, in order to estimate the pose of a mobile robot, whereby the directionality of the beam antenna is used to estimate the heading of the robot. The paper presents the experimental results of measurements in an office building. Index Terms—Mobile robots, global localization, pose estimation, WLAN, received signal strength. I.