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6 Go to frame 13. Rotate the three spine links in the opposite

direction: – 15 degrees in the local Y axis for Bip01 Spine; 10 degrees for

Bip01 Spine02; and 15 degrees for the shoulders, Bip01 Spine03.

Because of other Biped keys, the spine returns to a straight posture by

frame 5, so you don’t have to “overcompensate” the rotation value as

you did for the hips.

7 Finally, go to frame 25 and rotate the spine to its frame 1 position: 15

degrees in the local Y axis for Bip01 Spine; – 10 degrees for Bip01 Spine02;

and – 15 degrees for the shoulders, Bip01 Spine03

The last bit of movement to add is, appropriately, the tail, which mirrors the

spine movement in a similar S-curve. Like head movement, tail movement is

a secondary motion that doesn’t affect the mechanics of the walk, but does

give it greater realism.

1036 | Chapter 5 Character-Animation Tutorials