Ebook Introduction to AutoCad 2010 - 2D and 2D Design: Part 2

Part2 3D Design Chapter 12 Introducing 3D modelling AIMS OFTHIS CHAPTER The aims of this chapter are: 1. To introduce the tools used for the construction of 3D solid models. 2. To give examples of the construction of 3D solid models using tools from the Home/ Modelingpanel. 3. To give examples of 2D outlines suitable as a basis for the construction of 3D solid models. 4. To give examples of constructions involving the Boolean operators Union, Subtractand Intersect. 223 224 Introduction to AutoCAD 2010 Introduction As shown in Chapter 1 the AutoCAD coordinate system includes a third coordinate direction Z, which, when dealing with 2D drawing in previous chapters, has not been used. 3D model drawings make use of this third Z coordinate. The 3D Modeling workspace It is possible to construct 3D model drawings in the AutoCAD Classic or 2D Drafting & Annotation workspaces, but in Part 2 of this book we will be working in the 3D Modeling workspace. To set this workspace click the Workspace Settings icon in the status bar and select 3D Modeling from the menu which appears (Fig. 12.1). The 3D Modeling workspace appears (Fig. 12.2). Fig. 12.1 Selecting 3D Modeling from the Workspace Switching menu Fig. 12.2 The 3D Modeling workspace in Parallel projection Introducing 3D modelling 225 The workspace in Fig. 12.2 shows grid lines in Parallel projection mode, brought about by entering perspective at the command line, followed by entering 0 in response to the prompt which appears. This is the window in which the examples in this chapter will be constructed. Note the ViewCube at the top right-hand corner of the drawing area. In Fig. 12.2 this has been highlighted by moving the cursor onto the cube. Changes can be made to the appearance and uses of the cube in the ViewCube Settings dialog brought to screen from the right-click menu of the ViewCube (Fig. 12.3). Fig. 12.3 The ViewCube Settings dialog Methods of calling tools for 3D modelling The default 3D Modeling ribbon is shown in Fig. 12.4. Fig. 12.4 The 3D Modeling panels 226 Introduction to AutoCAD 2010 When calling the tools for the construction of 3D model drawings, similar methods can be used as when constructing 2D drawings. 3D tools can be called by: 1. A click on a tool icon in a 3D Modeling panel. 2. A click on a tool icon in the Modeling toolbar. 3. A click on the name of a tool from the Draw/Modeling drop-down menu. 4. Entering the tool name at the command line followed by pressing the Return button of the mouse or the Return key of the keyboard. 5. Some of the 3D tools have an abbreviation which can be entered at the command line instead of its full name. 6. Using the Dynamic Input method. Notes 1. As when constructing 2D drawings, no matter which method is used, and most operators will use a variety of these six methods, calling a tool results in prompt sequences appearing at the command prompt (or if using Dynamic Input on screen) as in the following example: Command:enter box right-click Specify first corner or [Center]: enter 90,120 right-click Specify other corner or [Cube/Length]:enter 150,200 Specify height or [2Point]:enter 50 Or, if the tool is called from its tool icon, or from a drop-down menu: Command:_box Specify first corner or [Center]: enter 90,120 right-click Specify other corner or [Cube/Length]:enter 150,200 Specify height or [2Point]:enter 50 2. In the following pages, if the tool’s sequences are to be repeated, they may be replaced by an abbreviated form such as: Command: box [prompts]: 90,120 [prompts]: 150,200 ... - tailieumienphi.vn