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Managing 3D Objects and Bitmaps
Figure 27 shows a few normals drawn on a sphere with 10 segments.
Normals let you define the exterior aspect of an object and its interactions with textures and
lighting. When you change the normal mode (also known as the projection mode), you act on
the geometry of an object. Here's a description of the functions that act on normals.
Corresponds to the projection mode illustrated above, wherein each of the faces is
visible.
Lets you create smooth surfaces. Where a sphere is concerned, we obtain a perfect
sphere:
I have kept the normals drawn on the shape so that you'll remember that the faces are
still present even if they can't be seen.
Lets you choose the object-specific rendering that is best suited to the object.
Lets you invert the normals. Since normals help you to define how an object is lit,
you can simulate an interior lighting by inverting the normals. The following is an
example of two cups. The first has the normals set to the default value and the
second has the normals inverted:
The second cup seems to be lit from the interior.
Draw Guide 64
Figure 27 - Object Normals
Figure 28 - Sphere with
smooth faces
Figure 29 - Inverting normals
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