Lecture 2 ENGR3030U Zeid Ch 2 and 13

Lecture 2 ENGR3030U Zeid Ch 2 and 13 - 3D Modelling and...

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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. 3D Modelling and Viewing – Ch. 2 Visualization – Ch. 13 Objectives: Geometric model terminology. Coordinate systems. Entities and features. Model transformations between coordinate systems (Ch. 12). System modes. Device drivers and graphics libraries. Model viewing and visualization algorithms.
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. First goal in using CAD/CAM system is to create geometric model of object. Solid model – complete, unique, unambiguous representation of object. It will have faces, edges, and vertices. Introduction
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Introduction Figure 2.1 Terminology of a solid model.
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Concepts utilized: Defining different WCSs (for each sketch plane created) Creation of entities – points, curves, surfaces Extrusion and revolution applied to create solid models Parametrics – assign dimensions at time of creation or later; frees us from worrying about dimensions while creating objects or models Introduction
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. CAD/CAM databases store full 3D models in following ways: Associative – information derived from user input Centralized – changes or additions to geometric model in one view is reflected automatically in all other views Integrated – geometric model can be used in all phases of product cycle Introduction
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Three modelling approaches: Primitive – combine, using Boolean operations, simple generic and standard shapes Features – embeds Boolean operations in feature definition Sketching – allows users to create more elaborate and general features from a sketch (use extrusion, revolution, sweep, loft, spiral, helix). Introduction
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Best approach? Sketching – combines all three. CAD/CAM vendors can also increase modelling domain of system without storing predefined features in system libraries. Legacy systems (CATIA, Unigraphics, I-DEAS) support all three. Introduction
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Types of Geometric Models Figure 2.2 Types of geometric models. The “1/2D” indicates symmetry along an axis.
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Types of Geometric Models Figure 2.3 A telephone geometric model. It is simply a composite 2½D model.
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ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Coordinate Systems Model Coordinate System (MCS) – reference space of model with respect to which all model data is stored. Cartesian system, X-Y-Z axis displayed on screen and can
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Lecture 2 ENGR3030U Zeid Ch 2 and 13 - 3D Modelling and...

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