16-reps - Overview of 3D Object Representations Reading for...

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1 Overview of 3D Object Representations Lecture 16 CPSC 578/478 Spring 2005 Today Overview of modeling -- Issues in geometric modeling -- Types of geometric models Course Calendar Assignment #3 Description Assignment #4 Description Reading for this week and next: Text, Chapter 13 Supplement with http://graphics.idav.ucdavis.edu/graphics/CAGDNotes/homepage.html 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. Modeling Issues to think about: How will object be created ? From a physical object that can be measured? To match an idea that an artist designer has? To match some physical criteria?
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2 Modeling Issues to think about: How will object be created? From a physical object that can be measured? how measured: digitizer, camera? what measured: points, orientations? how much processing: hole filling, smoothing To match an idea that an artist designer has? To match some physical criteria? Modeling Issues to think about: How will object be created? From a physical object that can be measured? To match an idea that an artist /designer has? How is design expressed – curves drawn in 2D? with a 3D input device? from cutting/pasting/scaling/shearing existing shapes? specifying rules or process/simulation? To match some physical criteria? Modeling Issues to think about: How will object be created? From a physical object that can be measured? To match an idea that an artist /designer has? To match some physical criteria? Making pieces fit together – a stopper in a bottle, clothes on a character Facilitate fluid flow – air around an airfoil Modeling Issues to think about: How will object be stored ? Compactness Organization Access Modeling Issues to think about: How will object be stored? Compactness What is the smallest number of bytes we can use, to save space, reduce transmission costs? (Transmission – collaborative design, Internet) What is the trade off between saving space and calculations that are needed to convert the object to a usable form (e.g. fractal mountains)? Organization
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This note was uploaded on 11/21/2009 for the course CPSC 478 taught by Professor Hollyrushmeier during the Spring '05 term at Yale.

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16-reps - Overview of 3D Object Representations Reading for...

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