2004
Table Of Contents
- Contents
- Chapter 1 - Find the Information You Need
- Part 1 - The User Interface
- Part 2 - Start, Organize, and Save a Drawing
- Part 3 - Control the Drawing Views
- Part 4 - Create and Modify Objects
- Chapter 14 - Control the Properties of Objects
- Chapter 15 - Use Precision Tools
- Chapter 16 - Draw Geometric Objects
- Chapter 17 - Change Existing Objects
- Part 5 - Hatches, Notes, and Dimensions
- Chapter 18 - Hatches, Fills, and Wipeouts
- Chapter 19 - Notes and Labels
- Chapter 20 - Dimensions and Tolerances
- Part 6 - Create Layouts and Plot Drawings
- Chapter 21 - Create Layouts
- Chapter 22 - Plot Drawings
- Part 7 - Share Data Between Drawings and Applications
- Chapter 23 - Reference Other Drawing Files (Xrefs)
- Chapter 24 - Link and Embed Data (OLE)
- Chapter 25 - Work with Data in Other Formats
- Chapter 26 - Access External Databases
- Overview of Using AutoCAD with External Databases
- Access a Database from Within AutoCAD
- Link Database Records to Graphical Objects
- Use Labels to Display Database Information in the Drawing
- Use Queries to Filter Database Information
- Share Link and Label Templates and Queries with Other Users
- Work with Links in Files from Earlier Releases
- Part 8 - Work with Other People and Organizations
- Chapter 27 - Protect and Sign Drawings
- Chapter 28 - Use the Internet to Share Drawings
- Chapter 29 - Insert and View Markups
- Chapter 30 - Publish Drawing Sets
- Part 9 - Create Realistic Images and Graphics
- Glossary
- Index
Create 3D Objects | 299
■ Use object snaps and grid snap carefully to ensure the precision of your
model.
■ Use coordinate filters to drop perpendiculars and easily locate points in
3D based on the location of points on other objects.
Methods for Creating Wireframe Models
With AutoCAD you can create wireframe models by positioning any 2D
planar object anywhere in 3D space, using several methods:
■ Entering 3D coordinates. You enter coordinates that define the X, Y, and
Z location of the object.
■ Setting the default construction plane (XY plane) on which you will draw
the object by defining a UCS.
■ Moving or copying the object to its proper 3D location after you create it.
Wireframe modeling is a skill that requires practice and experience. The best
approach to learning how to create wireframe models is to begin with simple
models before attempting models that are more complex.
To drop a perpendicular line from a 3D point down to the XY plane
1 From the Draw menu, choose Line.
2 Use an object snap to specify a point on an object that is not on the XY
plane of the UCS.
This defines the first point of the line.
3 Enter .xy and then enter @ at the Of prompt.
This operation extracts the X and Y coordinate values from the first point.
4 Enter 0 to specify the Z value.
Using coordinate filters, the X and Y values extracted from the first point
are combined with a new Z value (0) to finish the definition of the second
point.
5 Press
ENTER to end the command.
Create Surfaces
A mesh represents an object’s surface using planar facets. The mesh density,
or number of facets, is defined in terms of a matrix of M and N vertices,
similar to a grid consisting of columns and rows. M and N specify the column
and row position, respectively, of any given vertex. You can create meshes in
both 2D and 3D, but they are used primarily for 3D.