SimpleIK

What it does

SimpleIK takes a 3-joint chain, shoulder-elbow-wrist or hip-knee-ankle, and gives it FK and IK control with a switch to blend between them. You get an FK control per joint, an IK control at the end joint, a pole vector control for the elbow’s bend direction, and a switch control carrying the blend slider.

When to use it

Use SimpleIK for any generic 3-joint bending limb that needs an IK/FK switch and pole vector, without limb-specific extras. It’s also the foundation IK Arm and IK Leg build on, so use one of those instead when you need a clavicle or a foot.

Good to know

• Stretchy is optional: the chain can extend past rest length in IK mode (stretch only, no squash).
• The pole vector control has a pin slider that locks the elbow exactly under it.
• Match to IK / Match to FK hold the pose through the switch; plain Switch can pop.
• The 3 joints must be one unbroken parent chain, no branching.