A spline IK handle lets you control a joint chain with a NURBS curve. All joints driven by the spline IK handle stay on and follow the curve. The spline IK handle gives you additional attributes, such as twist, for additional control over the orientation of the joints in your joint chain.
To create a spline IK handle and automatically create the spline IK NURBS curves
The spline IK handle and a NURBS curve appears on the joint chain.
To create a spline IK handle using a pre-existing NURBS curve
Create a simple curve with no sharp bends to ensure the joint chain moves smoothly when you animate the curve.
If you create a curve with few CVs, your control of the curve’s shape and skeleton’s movement will be less precise, but you’ll be able to manipulate the curve and its joint chain more easily.
See also Components of NURBS curves.
The spline IK handle appears on the joint chain. The joints in the chain rotate to follow the shape of the curve.