Moving the GameObject - Learn Unity3D Programming with UnityScript - page 139

As you know from reviewing the Scripting Reference (*cough cough* You DID review it, right?)
the OnAnimatorMove() function is called every frame after the state machines. This occurs before
OnAnimatorIK() , where IK stands for “Inverse Kinematics,” another animation method available in
Unity Pro.
(3) var animator : Animator = GetComponent(Animator);
if (animator)
The animator variable is null if an Animator Component is not attached to the zombie game object,
so in the following line it is used in the conditional if statement. If the game object has an animator,
the following block of code will be executed, but if there is no animator, it is skipped.
(4) var newPosition:Vector3 = transform.position;
Within the conditional, the newPosition Vector3 type variable is declared, then assigned the current
transform position of the zombie game object.
(5) newPosition.x += WalkX * Time.deltaTime;
newPosition.z += WalkZ * Time.deltaTime;
The transform's x and z coordinates are updated each frame by the WalkX and WalkZ factors and
smoothed with the now familiar Time.deltaTime .
(6) transform.position = newPosition;
Finally, the zombie game object's transform position is updated with the new x and z property
values.
Save the script. In the Unity editor, drag the script from the Property panel to the zombie_lowres
game object in the Hierarchy view to attach it. Two things happen in the Inspector when you
do this. The ZombieMotionScript appears as a component, as you expect. Additionally, the
Animator component's Apply Root Motion changed to Handled by Script when it detected the
OnAnimationMove() function within the script (Figure 5-34 ). Save the scene and the project.
Figure 5-34. Newly attached ZombieMotionScript component, and Handled by Script update in the Animator component's Apply
Root Motion property