AutoCAD Tutorials Level 2

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AutoCAD 2012 Tutorial ® Second Level: 3D Modeling Randy H. Shih Oregon Institute of Technology PUBLICATIONS SDC www.SDCpublications.com Schroff Development Corporation Visit the following websites to learn more about this book: AutoCAD® 2012 Tutorial: 3D Modeling 3-1 Chapter 3 3D Wireframe Modeling      Using the Setup Wizard Create Wireframe Models Apply the Box Method in Creating Models Construct with the Copy Command Understand the Available 3D Coordinates Input Options  U
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    AutoCAD ® 2012 Tutorial Second Level: 3D Modeling Randy H. Shih Oregon Institute of Technology SDC   www.SDCpublications.com Schroff Development Corporation PUBLICATIONS    Visit the following websites to learn more about this book:  AutoCAD ® 2012   Tutorial: 3D Modeling 3-1 Chapter 3   3D Wireframe Modeling    Using the Setup Wizard    Create Wireframe Models    Apply the Box Method in Creating Models    Construct with the Copy Command    Understand the Available 3D CoordinatesInput Options      Using the View Toolbar       Setup and Using the TRIM options    3-2 AutoCAD ® 2012   Tutorial: 3D Modeling Introduction The first true 3D computer model created on CAD systems in the late 1970s was the 3Dwireframe model. Computer generated 3D wireframe models contain information aboutthe locations of all the corners and edges in space coordinates. The 3D wireframe modelscan be viewed from any direction as needed and are in general reasonably goodrepresentations of 3D design. But because surface definition is not part of a wireframemodel, all wireframe images have the inherent problem of ambiguity.   For example, in thefigure displayed below, which corner is in front, corner A or corner B? The ambiguity problem becomes much more serious with complex designs that have many edges andcorners. Wireframe Ambiguity : Which corner is in front, A or B?The main advantage of using a 3D wireframe modeler to create 3D models is itssimplicity. The computer hardware requirements for wireframe modelers are typicallymuch lower than the requirements for surface and solid modelers. A 3D wireframemodel, also known as a stick-figure model or a skeleton model, contains only informationabout the locations of all the corners and edges of the design in space coordinates. Youshould also realize that, in some cases, it could be quite difficult to locate some of thecorner locations while creating a 3D wireframe model. Note that 3D wireframe modelersare usually used in conjunction with surfacing modelers, which we will discuss in thelater chapters of this text, to eliminate the problem of ambiguity.With most CAD systems, creating 3D wireframe models usually starts with constructing2D entities in 3D space. Two of the most commonly used methods for creating 3Dwireframe models are the Box method and the 2D Extrusion method . As the nameimplies, the  Box method  involves the creation of a 3D box with the edges constructedfrom the overall height, width and depth dimensions of the design. The 3D wireframemodel is typically completed by locating and connecting corners within the box.
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