Create an animation using multi-chain IK handles attached to a skeleton.
Run IK to render your animation
Set the IK handle rotation behavior
If you select All, the Run IK simulation runs on all root-level skeletons that have multi-chain IK handles, whether or not they are picked.
A root-level skeleton is a joint node with no ancestors that are joint nodes. This joint node and all joint nodes below it make up a skeleton.
If you select Active, the Run IK simulation runs on all joint nodes on the skeletons that are active.
The skeletons are defined from the picked joint node and all joint nodes below it. Anything that is picked but is not a joint node will be ignored.
The default frame range includes the range of animation for all the IK handles attached to the picked skeletons.
The IK simulation starts at the current frame and runs until you press the Esc key.
Lets you specify start and end frames. When you click this button, these controls appear:
You can specify the frame range for the IK simulation by typing the Start Frame and End Frame values. These values apply for running the IK simulation only if Option Window is selected.
This is how often keyframes are set for a skeleton during the IK simulation. If the Simplify option is ON, some of these keyframes may be removed after the simulation is complete.
This is the increment at which the Run IK simulation is run. For example, if the Sample value is 0.2 frames and the By value is 1.0, then the IK simulation runs for 5 steps for each frame before setting a keyframe in the skeleton.
Since the IK handle animation is sampled at different frame values, inverse kinematics may cause a jump from one frame to another. Choosing a smaller Sample value makes the inverse kinematics solution smoother, even though keyframes are generated only at the By Frames increments.
If the Simplify option is toggled ON (indicated by a check-mark), all the animation curves that were created in the skeleton during the IK simulation are simplified after the simulation to remove as many keyframes as possible within the given tolerance, while still preserving the shape of the original curve.
When it is checked, the following additional controls appear:
These tolerance values are used for simplifying the curve. A tolerance specifies how much the simplified curve may differ from the unsimplified curve at each keyframe.
These two sliders let you specify different tolerances for curves that are animating joint rotation versus those animating joint translation. For example, the default tolerance for rotation is higher than that of translation because a difference of one degree of rotation is usually less noticeable than a difference of one unit of translation.
If this option is set ON, all multi-chain IK handles are disabled after the Run IK simulation.
If this option is set ON, each time a keyframe is computed, the skeletons are redrawn in their configuration at that frame. This gives instant feedback for the Run IK simulation.
If this option is set on, any single-chain IK and spline IK animation information is also translated into rotational information on the skeleton in addition to the translated multi-chain IK. When you select this option, the following additional controls are displayed:
This option turns off the single-chain and spline IK handles after Run IK is applied. To turn the single-chain and spline IK handles back on, use Edit > Rest Pose > Set rest pose, or the Information Window.
If you are going to render an animation with Motion Blur,
or Field Render (see Render > Globals
for details), you may want
to use motion blur compensation, field render compensation, or
both during the Run IK simulation. These compensations only
apply on animations translated from single-chain or spline IK handles.
> Blur Effects.
> Image File Output.
