Computational Geometry. Definition, Application Areas, and Course Overview
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1 Computational Geometry Definition, Application Areas, and Course Overview
2 Computational Geometry is a subfield of the Design and Analysis of Algorithms
3 Computational Geometry is a subfield of the Design and Analysis of Algorithms deals with efficient data structures and algorithms for geometric problems
4 Computational Geometry is a subfield of the Design and Analysis of Algorithms deals with efficient data structures and algorithms for geometric problems is only about 30 years old
5 Computational Geometry is a subfield of the Design and Analysis of Algorithms deals with efficient data structures and algorithms for geometric problems is only about 30 years old started out by developing solid theoretical foundations, but became more and more applied over the last years
6 Application Areas Computer Graphics Computer-aided design / manufacturing Telecommunication Geology Architecture Geographic Information Systems VLSI design (chip layout)...
7 This course covers the theoretical basis of Computational Geometry: important algorithms and data structures design patterns
8 This course covers the theoretical basis of Computational Geometry: important algorithms and data structures design patterns mentions, but does not cover applications
9 This course covers the theoretical basis of Computational Geometry: important algorithms and data structures design patterns mentions, but does not cover applications does not require you to program anything
10 This course covers the theoretical basis of Computational Geometry: important algorithms and data structures design patterns mentions, but does not cover applications does not require you to program anything requires you to solve homeworks in a careful mathematically correct way
11 Surface Reconstruction Digitizing 3-dimensional objects Stanford Bunny
12 Surface Reconstruction Step 1: Scan the object (3d laser scanner) set of points in R 3
13 Surface Reconstruction Step 2: Create a triangulation set of triangles in R 3
14 Surface Reconstruction Step 3: process the triangulation (rendering) smooth surface in R 3
15 Surface Reconstruction Major Computational Geometry task: Create a good triangulation
16 In this Course: Good and bad triangulations in R 2 bad triangulation (long and skinny triangles)
17 In this Course: Good and bad triangulations in R 2 good triangulation (no small angles, almost regular triangles)
18 Collision detection Check whether two (possibly complicated) 3d objects intersect!
19 Collision detection Bounding volume heuristic: Approximate the objects by simple ones that enclose them (bounding volumes)
20 Collision detection Bounding volume heuristic: Approximate the objects by simple ones that enclose them (bounding volumes) popular bounding volumes: boxes, spheres, ellipsoids,...
21 Collision detection Bounding volume heuristic: Approximate the objects by simple ones that enclose them (bounding volumes) popular bounding volumes: boxes, spheres, ellipsoids,... if bounding volumes don t intersect, the objects don t intersect, either
22 Collision detection Bounding volume heuristic: Approximate the objects by simple ones that enclose them (bounding volumes) popular bounding volumes: boxes, spheres, ellipsoids,... if bounding volumes don t intersect, the objects don t intersect, either only if bounding volumes intersect, apply more expensive intersection test(s)
23 In this Course: Smallest enclosing ball Given: finite point set in R d
24 In this Course: Smallest enclosing ball Given: finite point set in R d Wanted: the smallest ball that contains all the points
25 In this Course: Smallest enclosing ball Given: finite point set in R d Wanted: the smallest ball that contains all the points popular free software (also some commercial licenses sold):
26 Boolean Operations Given two (2d,3d) shapes, compute their...
27 Boolean Operations ubiquituous in computer-aided design
28 In this Course: Arrangements of lines
29 In this Course: Arrangements of lines Link to Boolean Operations:
30 In this Course: Arrangements of lines Link to Boolean Operations: Arrangement contains all the unions / differences / intersections
31 In this Course: Topic Overview Convex Hulls Line Sweep (design pattern) for segment intersections Triangulations of point sets Delaunay Triangulations Point Location Trapezoidal Maps Voronoi Diagrams
32 In this Course: Topic Overview Pseudotriangulations Linear Programming Smallest Enclosing Balls Line Arrangements Davenport-Schinzel sequences Motion planning Epsilon Nets
33 In this Course: Topic Overview Pseudotriangulations Linear Programming Smallest Enclosing Balls Line Arrangements Davenport-Schinzel sequences Motion planning Epsilon Nets discrete and combinatorial geometry
34 Formalities Weekly Exercise session + exercise sheets (marked, but not graded) 4 graded homeworks, to be submitted in LaTeX (usually two weeks time) 30% 2 oral presentations (5 minutes each) about a topic that you have covered in a homework 30 minute oral exam, with 30 minutes preparation time; one question will be from the weekly exercise sheets; 70%
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