OpenOffice.org OpenOffice - 3.3 Guía de usuario descargar pdf (Pagina 118)

In order for the Effects dialog to take over all the current properties of the object,

you must click the button. If you deactivate this button before you leave an object

and click on it again when you open the Effects dialog for another object, the settings

are carried over from the first object to the second object. You can use this to

transfer favorite settings from one object to another, as all the settings are brought

over to the new object. In normal use, however, the icon should be left activated.

At the bottom left of the dialog is another row of buttons (see Figure 139), which are

available on each page.

Figure 139: Buttons for geometric transformations

The first two buttons correspond to the menu commands Modify > Convert > To 3D

/ To 3D Rotation Object. When the Effects dialog for a 3D object is called up, these

buttons are inactive. Selecting a 2D object activates them. The third icon switches a

perspective view of the object on or off.

Converts the selected 2D object to an extrusion body.

Converts the selected 2D object to a rotation body.

Switches between a central projection and a perspective projection.

With a central projection parallel edges are shown as meeting at some common point

in the distance, as shown on the button symbol. Parallel projection retains all parallel

edges as parallel, a procedure often used to produce oblique figures in school. The

switching process is carried out on the entire 3D scene.

With central projection (see Figure 140), Draw creates the object with three

vanishing points. The parameters for central projection are set (indirectly) through

the camera settings on the Shading dialog page.

Figure 140: Figure shown using central projection.

For clarity, the projection lines have been added.

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