Create stretchy legs with controllers:In this exercise, you will add a scale controller to a biped's legs to stretch them
during a portion of an animation.1 Open stretchyleg_start.max.2 Play the animation.
The biped walks for 10 paces, zooms to a lower level, and then walks
another five steps. You’ll add the scale controller, then animate the biped
so that its legs stretch during the period of the downward leap.3 Move the time slider to frame 162, then select the Bip01 L Thigh object,
the blue leg.4 On the Motion panel, open the Assign Controller rollout.5 In the controller list window, expand the Biped SubAnim entry.
Now you can see the three list controllers.6 Click the plus sign (+) next to BipScaleList to expand this controller.
Select the entry marked Available, then click the Assign Controller button.
The Assign Scale Controller dialog appears.7 Choose Scale XYZ from the list, and click OK to close the dialog.8 On the 3ds Max main toolbar, click the Select And Scale button.
The Scale gizmo is visible on the thigh in the viewport.9 Turn on Auto Key.
First, you will set a key to start the stretch. You don’t want the stretch to
start before frame 162. You want the biped to have a normal leg
(unstretched) from the start of the animation up to this frame.10 Using the Scale gizmo, stretch the leg very slightly in the X-axis at this
frame, so the final value in the Coordinate rollout is 100 (no stretch).826 | Chapter 5 Character-Animation Tutorials