9

Inverse Kinematics Rollout 497
Inter face
Sliding/Rotational Joints rollo uts
The Sliding Joints rollout and Rotational Joints
rollout contain similar controls for position and
rotation,respectively.Also,eachrolloutcontains
identical group boxes for control of the X, Y, and Z
axes.
X/Y/Z Axis groups
Active—Activatesanaxis(X/Y/Z).Allowsthe
selectedobjecttoslideonorrotateaboutthe
activated axis.
Limited—Limits the range of motion or rotation
allowedonanactiveaxis.Useinconjunctionwith
the From and To spinners. Most j oints are limited
in their range of motion along an active axis. For
example, a piston slides only within the leng th of
its cylinder.
Ease—Causes a joint to resist motion as it
approaches its From and To limits. Simulates an
organic joint, or worn mechanical joint, mo ving or
rotatingfreelyinthemiddleofitsrangeofmotion
but moving less freely at the extremes of its range.
From and To S pinners —Determine for position
and rotation limits. Use in conjunction with the
Limited funct ion.
Spring B ack —ActivatesSpringBack.Eachjointhas
a rest position. As the joint moves further from the
rest posit ion, an increasingly larger force pulls the
joint back to its rest position, like a spring.
Spr ing B ack (spinner )—Sets the rest p osition
for the joint. For rotational joints, this is the
orientation of the joint in degrees; for sliding
joints, it’s the position in units. Adjusting t his is
similar to adjusting the From/To spinners. You
see the orientation/position while performing the
adjustment, but when you release the spinner the
object returns to its previous state.
If you’re using the HD Solver, you must turn on
Show Initial State (Motion panel > IK Controller
Parameters rollout) to see the effect on the
geometry during the adjustment .
Spr ing Tension—Sets the strength of the "spring."
Higher values cause the spring to pull harder as
the joint moves further from its rest position. A
setting of 0 turns off the spr ing; very high settings
can turn the joint into a limit because you can
reach the point where the spring is too strong to
allow the joint to move past a certain point.
Dampi ng—Applies resistance over a joint’s full
range of motion or rotation. Simulates the natural
effect of joint friction or inertia. As a joint
corrodes, dries out, or is put under a heavy load, it
resists motion along its active axes.
Interactive and Applied IK
Rollouts
Inverse K inematics Rollout
Make a selection. > Hierarchy panel > IK > Inverse
Kinematics rollout
The Inverse Kinematics rollout displays different
contro ls based on IK Solvers applied to the selected