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Creating 3D objects

Although Draw does not match the functionality of leading drawing or picture editing

programs, it is capable of producing and editing very good 3D drawings and pictures.

Draw offers two different types of 3D objects: 3D bodies and 3D shapes. Depending

on which type you choose, there are different possibilities for further editing of the

object (rotation, illumination, perspective). 3D shapes are simpler to set up and edit

than 3D bodies, but 3D bodies currently allow for more customization.

Creating 3D bodies

You can produce 3D bodies in three ways: extrusion, body rotation, and using ready

made objects. In this chapter, these methods are called Variation 1, 2, and 3. Two

further variations, extruding Basic Shapes and converting text to 3D, are also

described.

Variation 1: Extrusion

First, draw one of the common Draw objects, for example a square/rectangle,

circle/ellipse or a text box using the or icons on the Drawing toolbar.

Next, choose Modify > Convert > To 3D (or right-click on the object and choose

Convert > To 3D, or click the icon) to produce a 3D object from the 2D surface.

The icon is not usually visible on the Drawing toolbar. To make it visible, select

Visible Buttons from the toolbar menu at the right-hand end of the toolbar and click

on the icon to make it visible.

Figure 128: Extruding 3D objects from 2D surfaces

The procedure by which parallel surfaces are moved to create a 3D object is known

as extrusion. In this case the 2D surface is moved forwards “out of” the drawing

level. At the same time the object is slightly tilted and central projection turned on so

that one can better recognize the object. Draw uses a default value for the extrusion

(the body depth) based on the size of the 2D object. The value can be changed after

the extrusion; see “Editing 3D objects” on page 116).

Variation 2: Body rotation

Choose a common drawing object, for example a (non-black) line. Then change this

into a rotation body. Draw provides two methods to do this.

Method 1. Click the icon in the Drawing toolbar (this icon also usually needs to

be made visible) or choose Modify > Convert > To 3D Rotation object. With this

rotation method, the axis of rotation coincides with the left edge of the enclosing

selection rectangle, through the green rectangle handles.

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OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 112