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Figure 148: Left: without “Double-Sided”

Middle: with continuous lines but without “Double-Sided”

Right: with “Double-Sided”

Use the buttons in the section Normals to modify the normals of a 3D object.

A Normal is a straight line which is perpendicular to the surface of an object (in the

same way that a vector, starting from an inner point and extending outwards, is at

right angles to the surface of the object at the point where it exits). Figure 149 shows

some normals extending outwards from a sphere made up of 10 segments.

Figure 149: Normals (vectors) of

a 3D sphere with 10 segments

Using normals, the display of the object surface and the variation in colors, textures

and lighting can be controlled, influencing directly how the surface of the object is

rendered.

The first three icons (in Figure 141) work as “either-or” switches. Only one of the

effects can be active at a given time; an effect can be switched off by clicking on one

of the other icons.

The settings belong to individual objects, not scenes; every object can have its own

setting. The rest of the icons are normal toggle “on-off” switches. The following

effects are available:

Object specific: The object is rendered to produce the best result

independent of its shape. Single segments are changed but their “edges” will

hardly be visible.

Flat: The surface of the 3D object will be divided into single polygons, whose

edges are clearly recognizable. Every polygon is generated with a uniform

color.

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