FK/IK Switching: Interval Matching

• Passing control between FK and IK is easy

  • Just drive the native FK/IK parameter
  • GUI: Drive the param from a neutral location!

• Avoiding hitches is the hard part

  • Make sure that both sets of keys match physically!

• Interval matching:

  • Keys at both ends of a transition must be doubled up
  • It's even better if all keys are doubled
    • FK/IK Blends are a good cheat
    • Add a bit of wobble to an IK move
    • Add some power to an FK step

• Script based (set matching keys on demand)

  • Simpler to build and maintain
  • Extra work for the animator

• Callback based (set matching keys automatically)

  • Hard to use with auto-key