Unable to set an IK motion constraint on the last bone in a joint (Flash CS4 Professional)

One of the features of Inverse Kinematic animation (IK) in Adobe Flash CS4 Professional is the ability to constrain the rotation of a joint in an armature. However, in an armature with a string of connected bones, you cannot constrain the last joint in the armature.

For more information on IK animation, see "Adjust IK motion constraints" in Flash CS4 Professional Help

Setting constrain on the last joint is not a designed feature of IK in Flash CS4 Professional.

To work around this issue, add one more invisible bone to the structure. This makes the visible 'last' bone actually the penultimate bone, and the actual last bone one that is connected to an invisible movie clip.

Create several movieclips on the stage.

Using the Bone tool, create a bone structure between all the clips.

Select each bone and set a constrain value in the Properties inspector (you will not be able to constrain the tail bone).

Create one more movie clip next to the tail. Because of the way timeline layers work with IK, you will need to create this clip on different layer.

Draw a bone from the tail to your additional movieclip.

Select the last constrainable joint (the one going to the tail) and constrain it to 45 degrees.

Select the last (added) movie clip.

In the Properties inspector,click theColor Effect menu, and then select Alpha.

Set the Alpha value to zero.

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Unable to set an IK motion constraint on the last bone in a joint (Flash CS4 Professional)

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