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21-meshessubdivision

21-meshessubdivision - Class Calendar Meshes/Subdivision...

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1 Meshes/Subdivision Lecture 21 CPSC 578/478 Spring 2005 Meshes Representation Processing Subdivision Surfaces detour to fractals revisit parametric surfaces Class Calendar: April 6: assignment #4 topic/teams due TODAY April 11: assignment #4 short proposal due April 13: Quiz #2 April 18: assignment #4 long proposal due April 20: assignment #4 5 min oral proposal/preliminary results May 10: assignment #4 code, executable report due QUIZ #2 Material covered: Lectures from Feb. 16 to Apr. 11 (inclusive) Like last time: Can bring one 8.5 x 11 inch paper Study Guide will be posted on Web on Sunday Course Syllabus I. Image processing II. Rendering III. Modeling IV. Animation V. Advanced Topics Image Processing Modeling Animation Rendering Modeling How do we ... Create 3D objects? Store 3D objects? Use 3D objects? Different methods for different object representations In different phases (creation, storage, use) the same object may be represented in different ways.
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2 3D Object Representations Raw data Point cloud Range image Polygon soup Surfaces Mesh Subdivision Parametric Implicit Solids Voxels BSP tree CSG Sweep High-level structures Scene graph Skeleton Application specific implicits Volume rendering Ray acceleration Assignment #3 3D Object Representations Raw data Point cloud Range image Polygon soup Surfaces Mesh Subdivision Parametric Implicit Solids Voxels BSP tree CSG Sweep High-level structures Scene graph Skeleton Application specific 9 Polygonal (Triangle) Meshes Creation Parametric/Implicit Conversion Scanners Representation Winged Edge Geometric Processing Compression Simplification Smoothing 10 Another source of Meshes: 3D scanning Examples of types: Silhouette -- inexpensive Triangulation – “small” objects Time of flight – “large” objects REVIEW Polygon Meshes Mesh Representations Independent faces Vertex and face tables Adjacency lists Winged-Edge Independent Faces Each face lists vertex coordinates Redundant vertices No topology information
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3 Vertex and Face Tables Each face lists vertex references Shared vertices Still no topology information Adjacency Lists Store all vertex, edge, and face adjacencies Efficient topology traversal Extra storage Partial Adjacency Lists Can we store only some adjacency relationships and derive others?
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