Key Concept: IK Control Groups

• Control groups = multiple functions in one control

  • Effectors parented or constrained to controls
  • Typically, position and orientation
  • Sometimes, position & pole vector
  • Pivots and parent spaces can modify IK behavior

• “Double IKâ€?

  • A second IK handle drives the extremity
  • Pro: Automatic pointing behavior
  • Con: Awkward with multiple joints in extremity ; imprecise

• Orient Constraints

  • Pro: Exactly predictable behavior
  • Con: No seeking; mechanical breaks in hyperextension