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Create menu > Systems > Bones > Choose SplineIKSolver as IK Solver and check Assign to Children > Create bone structure
The Spline IK Solver dialog appears after bone creation if the Spline IK Solver has been selected as the IK solver and Assign to Children is checked.
This dialog sets parameters for the spline that will be created to control the bone structure. The spline, in turn, is shaped by the positions of helper objects at each knot (control point).
IK Name—Sets the name of the IK chain object. This object appears as a set of blue crosshairs at the end of the chain after OK is clicked.
Auto Create Spline—Automatically creates the spline used for the Spline IK solver based on the parameters on this dialog. When this option is not checked, no spline is created and a spline must be manually created and assigned to the spline IK solver in order to use the solver. See Animating with the Spline IK Solver for this procedure. Default=checked.
Bezier—Creates a Bezier spline, similar to a spline create with the Create > Shapes > Line tool.
NURBS Point—Creates a NURBS Point Curve, where all knots (control nodes) lie on the curve.
NURBS CV—Creates a NURBS CV Curve, where knots (control nodes) do not necessarily lie on the curve.
Number of Spline Knots—Spline knots are similar to vertices on a spline, or control points and CVs on a NURBS curve. The spline or curve is altered by moving and animating the knots. The number of knots sets the degree of refinement on the curve as well as the number of points that can be selected and moved to change the shape of the curve.
The Number of Spline Knots defaults to the number of bones in the Spline IK chain. Since the purpose of a Spline IK solver is to reduce the number of objects that require animation, you would ordinarily set the Number of Spline Knots to a lower number, such as half the number of bones.
When creating the spline for Spline IK, helper objects can be placed at each knot, making it easier to move and animate the knots. More than one type of display can be enabled..
Center Marker—Displays a small X marker at each knot.
Axis Tripod—Displays a tripod axis at each knot. The axis remains visible when the helper is no longer selected.
Cross—Displays a cross at each knot.
Box—Displays a small at each knot.
Size—Sets the size for helpers.
Constant Screen Size—Keeps the sizes of helpers constant regardless of how much viewports are zoom in or out.
Draw On Top—Displays the helpers on top of all other objects in the scene.
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