6 On the Parameter Wiring dialog, set the control direction to the right,
which places the Percent parameter in control of the wheel rotation.
7 On the right-hand Expressions panel, type (2365*Percent)/13.
NOTEThe value 2365 is the length of the animation path you measured
earlier. When multiplied by the percent variable, it calculates the distance
the car has travelled at any given moment in time along the path. When
divided by the radius of the wheel (13), it provides the amount of rotation
needed for the wheel to turn.
8 Click Connect.
9 Scrub the animation to see the wheel rotation.
10 To better see the animation, click the Time Configuration button
and in the Time Configuration dialog > Time Display group, turn on
FRAME:TICKS.
11 Repeat steps 3 to 8 to link the Point helper to each of the remaining three
car wheels.
632 | Chapter 4 Animation Tutorials
