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Arrangements Efi Fogel Dan Halperin Lutz Kettner Monique Teillaud Ron Wein Nicola Wolpert 1
Introduction 1
Chronicles 3
Exact Construction of Planar Arrangements 5
Construction by Sweeping 7
Incremental Construction 20
Software for Planar Arrangements 25
The Cgal Arrangements Package 26
Arrangements Traits 33
Traits Classes from Exacus 36
An Emerging Cgal Curved Kernel 38
How To Speed Up Your Arrangement Computation in Cgal 40
Exact Construction in 3-Space 41
Sweeping Arrangements of Surfaces 41
Arrangements of Quadrics in 3D 45
Controlled Perturbation: Fixed-Precision Approximation of Arrangements 50
Applications 53
Boolean Operations on Generalized Polygons 53
Motion Planning for Discs 57
Lower Envelopes for Path Verification in Multi-Axis NC-Machining 59
Maximal Axis-Symmetric Polygon Contained in a Simple Polygon 62
Molecular Surfaces 63
Additional Applications 64
Further Reading and Open problems 66
Curved Voronoi Diagrams Jean-Daniel Boissonnat Camille Wormser Mariette Yvinec 67
Introduction 68
Lower Envelopes and Minimization Diagrams 70
Affine Voronoi Diagrams 72
Euclidean Voronoi Diagrams of Points 72
Delaunay Triangulation 74
Power Diagrams 78
Voronoi Diagrams with Algebraic Bisectors 81
Mobius Diagrams 81
Anisotropic Diagrams 86
Apollonius Diagrams 88
Linearization 92
Abstract Diagrams 92
Inverse Problem 97
Incremental Voronoi Algorithms 99
Planar Euclidean diagrams 101
Incremental Construction 101
The Voronoi Hierarchy 106
Medial Axis 109
Medial Axis and Lower Envelope 110
Approximation of the Medial Axis 110
Voronoi Diagrams in Cgal 114
Applications 115
Algebraic Issues in Computational Geometry Bernard Mourrain Sylvain Pion Susanne Schmitt Jean-Pierre Tecourt Elias Tsigaridas Nicola Wolpert 117
Introduction 117
Computers and Numbers 118
Machine Floating Point Numbers: the IEEE 754 norm 119
Interval Arithmetic 120
Filters 121
Effective Real Numbers 123
Algebraic Numbers 124
Isolating Interval Representation of Real Algebraic Numbers 125
Symbolic Representation of Real Algebraic Numbers 125
Computing with Algebraic Numbers 126
Resultant 126
Isolation 131
Algebraic Numbers of Small Degree 136
Comparison 138
Multivariate Problems 140
Topology of Planar Implicit Curves 142
The Algorithm from a Geometric Point of View 143
Algebraic Ingredients 144
How to Avoid Genericity Conditions 145
Topology of 3d Implicit Curves 146
Critical Points and Generic Position 147
The Projected Curves 148
Lifting a Point of the Projected Curve 149
Computing Points of the Curve above Critical Values 151
Connecting the Branches 152
The Algorithm 153
Software 154
Differential Geometry on Discrete Surfaces David Cohen-Steiner Jean-Marie Morvan 157
Geometric Properties of Subsets of Points 157
Length and Curvature of a Curve 158
The Length of Curves 158
The Curvature of Curves 159
The Area of a Surface 161
Definition of the Area 161
An Approximation Theorem 162
Curvatures of Surfaces 164
The Smooth Case 164
Pointwise Approximation of the Gaussian Curvature 165
From Pointwise to Local 167
Anisotropic Curvature Measures 174
[epsilon]-samples on a Surface 178
Application 179
Meshing of Surfaces Jean-Daniel Boissonnat David Cohen-Steiner Bernard Mourrain Gunter Rote Gert Vegter 181
Introduction: What is Meshing? 181
Overview 187
Marching Cubes and Cube-Based Algorithms 188
Criteria for a Correct Mesh Inside a Cube 190
Interval Arithmetic for Estimating the Range of a Function 190
Global Parameterizability: Snyder's Algorithm 191
Small Normal Variation 196
Delaunay Refinement Algorithms 201
Using the Local Feature Size 202
Using Critical Points 209
A Sweep Algorithm 213
Meshing a Curve 215
Meshing a Surface 216
Obtaining a Correct Mesh by Morse Theory 223
Sweeping through Parameter Space 223
Piecewise-Linear Interpolation of the Defining Function 224
Research Problems 227
Delaunay Triangulation Based Surface Reconstruction Frederic Cazals Joachim Giesen 231
Introduction 231
Surface Reconstruction 231
Applications 231
Reconstruction Using the Delaunay Triangulation 232
A Classification of Delaunay Based Surface Reconstruction Methods 233
Organization of the Chapter 234
Prerequisites 234
Delaunay Triangulations, Voronoi Diagrams and Related Concepts 234
Medial Axis and Derived Concepts 244
Topological and Geometric Equivalences 249
Exercises 252
Overview of the Algorithms 253
Tangent Plane Based Methods 253
Restricted Delaunay Based Methods 257
Inside / Outside Labeling 261
Empty Balls Methods 268
Evaluating Surface Reconstruction Algorithms 271
Software 272
Research Problems 273
Computational Topology: An Introduction Gunter Rote Gert Vegter 277
Introduction 277
Simplicial complexes 278
Simplicial homology 282
Morse Theory 295
Smooth functions and manifolds 295
Basic Results from Morse Theory 300
Exercises 310
Appendix - Generic Programming and The Cgal Library Efi Fogel Monique Teillaud 313
The Cgal Open Source Project 313
Generic Programming 314
Geometric Programming and Cgal 316
Cgal Contents 318
References 321
Index 341
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