Rigging for Realistic Movement - Game Character Creation with Blender and Unity - page 166

7. With this bone still selected, go to the Properties editor's Bone panel (click the button
with the bone on it) and use the text input panel at the top of the panel to rename the
bone Root .
8. Select the tail/tip of the Root bone and press E to extrude a new bone from it. Press
Z to confine the extrusion along the z-axis. This bone should move about halfway up
the back. Perform this operation again to create a bone that extends to the head/root
of the neck. Call these bones Spine.01 and Spine.02 , respectively (Figure 7.14).
9. Press Numpad 3 to go to the side view. Adjust the bones to better match the zombie's
anatomy. Bone placement is easily adjusted by selecting the joints between bones and
pressing G to move them around (Figure 7.15).
Now you have a simple basis for your armature. Next, you can create the limbs.

Figure 7.14
Adding two bones
for the spine

Figure 7.15
Adjusting the Root
and spine bones