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430 Chapter 12: Animation

remain disconnected (hierarchically speaking)

from the arm chain.

You can create view por t sliders using the

manipulator helper, and then u se the v iewport

sliderstocontrolthetransformsofthecontrol

objects. U se

wire parameters (page 2–393)

to hook

up the sliders with the control objects. You can

also create Custom Attributes to add these sliders

to the object rollouts.

Mix ing For ward Kinematics with Inverse

Kinematics

The HI IK solver provides a tool for mixing FK

and IK in a single animation track. There is an FK

subcontroller beneath the IK cont roller assigned

by this solver .

WhentheEnabledbuttonison,theFK

subcontroller values are preserved but ignored.

WhenEnabledisturnedoff,theFKsubcontroller

values apply. To access the Enabled button, select

thegoalandgototheMotionpanel,thenturnoff

the Enabled button. This w ill allow you to animate

using FK rotations of the bones or hierarchy

objects.

IK for F K p ose a llows one to turn on IK in middle

of FK manipulation. When the Enabled button is

turned off, and IK for FK Pose is on, then selecting

and moving the goal lets you use IK to create the

for ward kinematic keyframes. Moving the goal

poses the skeleton and add rotation keys to all the

objects in the chain when the Auto Key button is

on.

When working with IK and FK together it is

possibletocreateasituationwherethegoalhas

movedawayfromtheendofthechain. Usethe

IK/FK snap button to reposition the goal, snapping

it back to the end of the chain. When AutoSnap

is on, the snap happens automatically; when you

touch the goal, you don’t have to press the IK/FK

snap button.

Controlling HI IK Precision

When you are animating with HI Solvers, if you

find the animation of the limbs is not smooth, you

should try doubling the Iterations in the Solutions

group of the

HI Solver Pro perties rollout (page

2–437)

. You can also t ry reduce the T hresholds

value to smooth the animation.