2009

Number of Spline Knots Vertices on the spline, or control points and CVs
on the NURBS curve. You alter the spline or curve 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 default value is the number of bones in the Spline IK chain. Because one
purpose of a Spline IK solver is to reduce the number of objects that require
animation, you might want to use a lower value, such as half the number of
bones.
Helper Options group
Create Helpers When on, the software places one or more
Point helper on
page 2628 objects at each knot in the spline or curve, making it easier to move
and animate the knots.
You can enable more than one type of helper. When you move one helper,
the others at the same location also move, as does the curve knot.
Center Marker Places a small X-shaped Point helper at each knot.
Axis Tripod Places a small tripod-axis-shaped Point helper at each knot.
Cross Places a small cross-shaped Point helper at each knot.
Box Places a small box-shaped Point helper at each knot.
Size Sets the size for helpers.
Constant Screen Size Keeps the sizes of helpers constant regardless of the
zoom extent of the viewports.
Draw On Top Displays the helpers on top of all other objects in the scene for
improved visibility in busy scenes.
TIP To change the display of helpers after creation, select each helper and change
selections on the Modify panel.
Spline IK Solver Rollouts
Select a Spline IK Solver control (the blue cross at the end of the chain) >
Motion panel > Parameters button
Inverse Kinematics (IK) | 3455