code to generate barcode in c#.net Fig 42-6 42: Primitives PRIMITIVES in Software

Drawer QR Code 2d barcode in Software Fig 42-6 42: Primitives PRIMITIVES

Fig 42-6 42: Primitives PRIMITIVES
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Wohlers: Applying AutoCAD 2010
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IX Solid Modeling
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42 Primitives
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It is possible to create a wedge using the WEDGE command 5 Pick the Wedge button on the Modeling panel
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PRIMITIVES
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6 Pick two corner points to de ne the size of the wedge s base 7 Enter 75 for the height A wedge-shaped solid primitive appears, as shown in Fig 42-7 The BOX command enables you to create a solid box 8 From the Modeling panel, pick the Box button
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The Center option permits you to create a box by specifying a center point This activates the BOX command 9 Pick a point to represent one of the corners of the box 10 Pick the diagonally opposite corner of the base rectangle 11 Enter 2 for the height A box appears, as shown in Fig 42-8
Fig 42-8
To create a solid cube, you can select the BOX command s Cube option after selecting the rst point
The SPHERE command creates a solid sphere primitive
PRIMITIVES
12 Pick the Sphere button on the Modeling panel This activates the SPHERE command 13 Pick a point to de ne the center of the sphere 14 Enter 1 for the radius of the sphere The sphere appears, as shown in Fig 42-9
Fig 42-9
Part 9: Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
42 Primitives
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The PYRAMID command creates a solid pyramid primitive 15 Pick the Pyramid button on the Modeling panel 16 Pick a point in an open area to de ne the center of the pyramid s base 17 Enter 1 for the base radius and 15 for the height of the pyramid The pyramid appears, as shown in Fig 42-10
Fig 42-10 PRIMITIVES
The Sides option speci es the number of sides on the pyramid The Edge option allows you to de ne the base by specifying an edge instead of the center point
Controlling Mesh Divisions
Notice the gray lines that subdivide the surfaces on the mesh primitives These planar subdivisions are called tesselations Tesselations on curved surfaces are a collection of planar facets that approximate the actual curvature You can control the amount of tesselation in meshes 1 Pick the arrow in the lower right corner of the Primitives panel The Mesh Primitives Options dialog box appears, as shown in Fig 42-11 2 Select each of the mesh primitives, adjust the tesselation divisions, and notice how the model in the Preview pane changes (Make sure the Auto-update box is checked) Note that increasing tesselation produces smoother models, but also requires more computing power and may affect the speed of your system 3 Pick Cancel to close the dialog box, save your work, and exit AutoCAD
Fig 42-11
42: Primitives
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
42 Primitives
The McGraw Hill Companies, 2010
42 Review & Activities
REVIEW QUESTIONS
Answer the following questions on a separate sheet of paper 1 Describe the function of each of the following commands a CYLINDER b TORUS c CONE d WEDGE e BOX f SPHERE g PYRAMID h POLYSOLID 2 With what command can you create a football-shaped primitive 3 With what command can you create a mesh cube 4 With what command can you create solid walls
CHALLENGE YOUR THINKING
These questions are designed to further your knowledge of AutoCAD by encouraging you to explore the concepts presented in this chapter Answer each question on a separate sheet of paper 1 If you could slice open a solid primitive, what would you nd in the interior What would you nd in the interior of a mesh primitive 2 Experiment with the CYLINDER and CONE commands Is it possible to create a solid primitive cylinder or cone at other than a 90 (right) angle to its base Explain
Part 9: Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
42 Primitives
The McGraw Hill Companies, 2010
Review & Activities
APPLYING AUTOCAD SKILLS
Work the following problems to practice the commands and skills you learned in this chapter 1 Create a solid shaft that measures 5125 in diameter by 10 in length Rotate the shaft so that its length is parallel to the WCS 2 Create a mesh ball bearing that measures 3625 in diameter Use a polar array to create a ring of 16 balls using a 1 radius View the bearings in an isometric view, and apply the Realistic visual style, as shown in Fig 42-12 Save the drawing as 3dbearingdwg 3 Create an in ated bicycle inner-tube that measures 24 in diameter Make the tube diameter 2 4 Create a football-shaped primitive of any size on top of a 6 cube
Fig 42-12
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