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The knee bends to accommodate the new position of the foot.

The knee bends.

In this move, you’ve just used inverse kinematics. The foot, calf, and thigh

are linked together in a hierarchical chain. By moving the end of the

chain, the foot, you rotated the lower and upper leg objects.

8 Save the scene as MySwimmer02.max.

Animate the leg:

Everything you’ve done so far has been at frame 0. Now you’ll move forward
in time and animate the pose at frame 10.

1 Move the time slider to frame 10.

2 Move the foot downward on the Z axis until the knee straightens out.

3 Press Page Up twice to select Bip01 R Thigh.

4 Right-click and choose Rotate from the quad menu, then rotate the Bip01

R Thigh approximately −10 degrees about the Z axis.

Creating a Simple Freeform Animation | 769