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2+1 FK Torso
What:
- 2-DOF FK joints from pelvis to torso
- 1-axis fixup parented to each spine link to handle twist
- Shown here offset; actually co-located
- Torso's twist rotation drives fixups
- Skin is bound to fixups
For:
- Animate spine links with 2-axis FK
- Animate twist rotation on top chest joint
- Twist rotation distributed across fixups by expression or drivers
- Fixups never hand-animated
Pros & Cons:
- Like FK but more predictable
- Twist response can be tweaked in expression
Character Rigging Best Practices copyright 2006 Steve Theodore