AutoCAD 2002 Bible

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Figure 20-24: The Link Conversion dialog box


Using external databases to store data about drawing objects can reduce the size of drawings, simplify reporting, make data accessible to all users on a network, and enable you to edit a database from inside AutoCAD. The AutoCAD database connectivity feature involves configuring the data source, connecting a table to your drawing, and creating links between drawing objects and rows in the database. You can also create labels containing information from the database.

You can create SQL queries to refine the data you view. Link Select enables you to use queries and direct object selection to create combined selection sets. You can store queries and save them to a file for use by others. If you have links from prior releases, you should convert them to AutoCAD 2000/2002 format.

This chapter ends Part III, “Working with Data.” In Part IV, you start to draw in three dimensions.

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Part IV introduces you to three-dimensional drawing.

AutoCAD creates three types of 3D objects, also called models — wireframes, surfaces, and solids. Wireframes, as the name implies, look like models created with wire. They do not have real surfaces or solidity. However, they are useful for creating shapes that you can turn into surfaces or solids. Surfaces, unlike wireframes, can hide objects behind them. They are especially useful for creating unusually shaped objects. Solids are defined as the entire volume of space they enclose. You can add and subtract solids from each other, creating realistic objects.

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