Model Repair Leif Kobbelt RWTH Aachen University 1 - PowerPoint PPT Presentation

�� Model Repair Leif Kobbelt RWTH Aachen University 1

�� Model Repair • model repair is the removal of artifacts from a geometric model such that it becomes suitable for further processing. • produce a nice, manifold triangle mesh – with boundary or – without boundary (watertight) Leif Kobbelt RWTH Aachen University 2 2

�� Model Repair • types of input • surface-oriented algorithms – Filling holes in meshes [Liepa 2003] • volumetric algorithms – Simplification and repair of polygonal models using volumetric techniques [Nooruddin and Turk 2003] – Automatic restoration of polygon models [Bischoff, Pavic, Kobbelt 2005] • conclusion & outlook Leif Kobbelt RWTH Aachen University 3 3

Range Images • registered range images are a set of patches that describe different parts of an object. Registration Leif Kobbelt RWTH Aachen University 4 4

Range Images • large areas of overlap are ... – ... necessary for registration but – ... bad for consistency • how to merge the patches into a single mesh? – inconsistent geometry – incompatible connectivities large scale overlaps Leif Kobbelt RWTH Aachen University 5 5

Range Images • successfully merged range images are manifold meshes with holes and islands (i.e. boundaries) Leif Kobbelt RWTH Aachen University 6 6

Range Images • holes and islands are due to obstructions in the line of sight of the scanner • identify correspondences between holes and islands • fill holes – smoothly – geometry transfer/synthesis • avoid intersections holes and isles Leif Kobbelt RWTH Aachen University 7 7

Contoured Meshes • contoured meshes have been extracted from a volumetric representation (e.g. by marching cubes) Leif Kobbelt RWTH Aachen University 8 8

Contoured Meshes • contoured meshes are usually manifold and closed, but may contain topological noise – disconnected components – spurious handles – cavities Leif Kobbelt RWTH Aachen University 9 9

Triangulated NURBS • set of patches that contain small scale gaps and overlaps Leif Kobbelt RWTH Aachen University 10 10

Triangulated NURBS • gaps and overlaps are due to triangulating a common (trimmed) patch boundary differently from both sides • issues – consistent orientation – structure preservation small scale gaps and overlaps Leif Kobbelt RWTH Aachen University 11 11

Triangulated NURBS • typical workflow, e.g., in CAD/CAM: triangle mesh NURBS Editing Repair Simulation often:manu manual automatic al(!) Leif Kobbelt RWTH Aachen University 12 12

Triangle Soups • a triangle soup is a set of triangles without connectivity information Leif Kobbelt RWTH Aachen University 13 13

Triangle Soups • good for visualization but bad for downstream applications that require manifold meshes • in addition to the artifacts we already encountered: incompatible orientations complex edges singular vertex intersections Leif Kobbelt RWTH Aachen University 14 14

Not Covered In This Lecture ... • geometrical noise ➙ smoothing (Mark) • badly meshed manifolds ➙ remeshing (Pierre) Leif Kobbelt RWTH Aachen University 15 15

�� Model Repair • types of input • surface-oriented algorithms – Filling holes in meshes [Liepa 2003] • volumetric algorithms – Simplification and repair of polygonal models using volumetric techniques [Nooruddin and Turk 2003] – Automatic restoration of polygon models [Bischoff, Pavic, Kobbelt 2005] • conclusion & outlook Leif Kobbelt RWTH Aachen University 16 16

Surface-Oriented Algorithms • surface oriented approaches explicitly identify and resolve artifacts • methods – snapping – splitting – stitching – ... Leif Kobbelt RWTH Aachen University 17 17

Model Repair Leif Kobbelt RWTH Aachen University 1 - PowerPoint PPT Presentation

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