The general structure is done. However, you may also want to cut
an extra border outside the crack border loop, as shown in the cen-
ter in Figure 3-70, to improve the local tension.
Thickness
Primitives and polygons by default don’t have any thickness. If you
delete half of a polygon sphere, you’ll notice absolutely no thick-
ness. 3ds Max 6 has a tool named Shell Modifier that allows you to
give thickness to your object. In this section we show how to add
thickness to your mesh without using any special tool or script.
First, pick a sphere and delete half. Duplicate the object and
scale it down a bit.
72
Chapter 3 – Polygon Subdivision
Figure 3-69
Figure 3-70
Then flip the normals of the interior object and start welding the
vertices until the entire object is closed and has no holes. When fin-
ished, apply smoothing; you’ll notice almost no thickness.
Select the welded edges and chamfer until you get a desired thick-
ness. You may need to move the edges down. To improve the
tension, select the exterior border edges and chamfer again.
73
Chapter 3 – Polygon Subdivision
Figure 3-71
Figure 3-72
Figure 3-73
Another way to add thickness to your object is to duplicate it and
flip it as in the previous exercise and then attach the two pieces
together. This time, select the upper border edges, extrude them
down a little bit, and merge the vertices.
Do the same on the other side and the back and front. Now select all
the border edges and chamfer.
The chamfer borders will have more tension and the thickness will
look more rigid.
74
Chapter 3 – Polygon Subdivision
Figure 3-74
Figure 3-75
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