On the Inverse Kinematics
panel of the Preference Settings dialog, you set options for both
applied and interactive
To prevent transforming unlinked objects
while working in IK mode:
- Choose Customize menu Preferences Preference Settings dialog Inverse Kinematics tab.
- On the Inverse Kinematics panel, turn
off the option labeled Always Transform Children Of The World.
Single, unlinked objects
are hierarchies of one object. An unlinked object is its own root
and also a child of the world, so turning off Always Transform Children
Of The World prevents you from transforming single objects in IK mode.
The threshold and iterations
settings are a trade-off between accuracy and speed. With the two
groups of settings you can individually tune the behavior of Interactive
IK and Applied IK. Interactive IK provides fast, real-time response,
so you should set Interactive IK preferences for speed. Applied
IK provides the
IK solution to
follow objects very
closely. You should set applied IK preferences for accuracy.
Sets how close the end effector
has to get to the follow object or cursor position for the object
to be considered a valid solution. The value represents a distance
in the current display unit system. Small values increase accuracy
but take longer to solve.
Sets how accurately the end
effector has to match the orientation of the follow object to be
considered a valid solution. The value represents a rotation angle
in degrees. Small values increase accuracy but take longer to solve.
Sets the maximum number
of times 3ds Max Design repeats the IK calculations to find a valid
solution. A high iterations value increases the chance that 3ds Max Design can
calculate a valid IK solution, but the calculation takes longer
- Use Secondary Threshold
Compares the second derivative
effector to a very small threshold. If
the derivative is within the threshold, IK is terminated.
- Always Transform Children Of The World
Applies in both move and
rotate modes when IK is on. It affects only an object that is a
direct child of the world when the object is selected.
For example, if the root
of an IK chain is a child of the world, and you're manipulating an
object at the end of the chain (the root object itself isn't selected), 3ds Max Design observes
any constraints set for the root object. However, if you select
the root object and try to move it, its constraints will be ignored.