9

IK Solver Rollout (HI Solver) 455
Inter face
IK Solver group
The items in this group provide the ability to set
the start and end p oints of the selected HI I K
solver chain. There are also controls in this rollout
that allow you to use IK manipulation to create
forward kinematic rotational keyframes on the
hierarchy objects, and there are buttons to align
thegoalandtheendeffector.
Sol ver f ield —Allows selection of IK Solver. Choose
between the HI IK Solver and the IK Limb S olver
here. Any HI IK plug-in solver present at startup
w ill appear in this list, as well.
Enabled—Turns IK control of the chain on and off.
The HI IK Controller has an FK subcontroller.
When Enabled is selected, the FK subcontroller
values are overwritten by the IK controller. When
Enabledisturnedoff,theFKvaluesareused.You
can animate Enabled On and Off.
Use this to turn off the chain control by the goal,
whenyouwanttodoforwardrotations.
IK for FK Pose—LetsyouturnonIKinmiddle
of FK manipulation. When Enabled is off and
IKforFKPoseison,movingthegoalwillturn
on IK automatically in the middle of an FK
manipulation. The result of this is that all the FK
subcontrollers receive values from the IK sol ution.
Keys are placed on the hierarchy objects or the
bones, not on the goal. When both Enabled and
IK for FK Pose are turned off, moving the goal
doesnotaffectthechainatall.
IK /FK Snap—Performs an IK snap when i n FK
mode, and an FK snap in IK mo de.
IK Snap—If the goal has moved away from the end
ofthechain,clickingIK/FKSnapmovesthegoal
to coincide with the end link position.
FK Snap—ThevaluesofFKsubcontrollersare
suppressed by the solution of IK when IK is
on (Enabled is on). Their values don’t always
correspond to the cur rent pose of the chain. If you
turn off Enabled, the values of FK subcontrollers
will suddenly take over. This can cause the chain
to jump. FK Snap, before Enabled is turned on,
forces the FK subcontrollers to assume values from
the c urrent pose (which is determined by the IK.)
This eliminates the jump in the chain’s animation.
Auto Sna p—When Auto Snap is on, the software
automatically applies an IK/FK snap before you
turn Enabled on or off. If Auto Snap is not on, you
need to click IK/FK Snap b efore togg ling Enabled,
otherwise the chain will jump.
Preferred Angles group
SetAs Pref Angles—Sets the preferred angle for each
bone in the HI IK chain. The current parent-space
rotation of each bone is placed into its X, Y, and Z
Preferred Angle rotation channels as seen in the