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Create spline IK handles
Use spline IK
Use the advanced Spline IK twist controls
Pose joints with spline IK curves
To
manipulate the CVs of the spline IK NURBS curve
- Select
the NURBS curve.
- Turn
on
Display > NURBS > CVs.
- Turn
on
Display > NURBS > Hulls.
- Select
a CV on the NURBS curve.
TipFor easier manipulation of the curve, cluster
groups of the curve’s CVs. For more information on how to create
a cluster, see
Deformers.
- Do
one of the following:
- Drag a CV.
This moves the spline IK joint chain.
To
create a cluster deformer for each CV on the spline IK NURBS curve
- Select
the spline IK curve.
- In
the Surfaces menu set, select
Edit Curves > Selection > Cluster Curve.
A cluster deformer is created for each of the
spline IK curve’s CVs.
To
twist and roll the spline IK joint chain
- Select
the spline IK handle.
- Select
Modify > Transformation Tools
> Show Manipulator Tool.
The twist and roll circular manipulators appear
at the start joint and end joints of the spline IK chain.
- Do
the following:
- To roll the entire joint chain,
drag the circular manipulator at the start joint.
- To twist the joint chain, drag
the circular manipulator at the end joint.
- You
can also adjust twist and roll by selecting the spline IK handle
and entering values for Roll and Twist in
the Channel Box or Attribute
Editor.
To slide
the joint chain along the curve
- Select
the spline IK handle.
- In
the Attribute Editor, select the
ikHandle node’s tab.
- In the IK Solver Attributes section,
turn on Root On Curve.
This constrains the start joint of the spline
IK handle to a position on the curve. It also provides an offset
manipulator to slide the start joint along the curve.
- Select
Modify > Transformation Tools
> Show Manipulator Tool.
The offset manipulator appears at the start
joint.
- Do
one of the following:
- Drag
the manipulator to slide the joint chain along the curve.
If you drag the start joint to the end of the
curve, the child joints move off the end of the curve in a straight
line.
- Enter values for Offset in
the Attribute Editor to move the
root of the spline IK chain along the curve.
Note
- You
cannot drag the manipulator past the ends of the curve.
- If
you turn Root On Curve off, the Offset attribute
is ignored.
To translate,
rotate, and scale the spline IK curve
- Select
the spline IK curve.
- Do
one of the following:
- Select
the Move Tool (hotkey: w) from
the Tool Box
The translation manipulators appear.
- Select
the Rotate Tool (hotkey: e) from
the Tool Box
The rotation manipulators appear.
- Select
the Scale Tool (hotkey: r) from
the Tool Box
The scaling manipulators appear.
- Use
the Move, Rotate, and Scale tools to translate, rotate, or scale
the curve.
NoteIf you created the spline IK handle with Root
on Curve off in the tool options, translating, rotating,
and scaling the curve does not translate the start joint.