The Flip option prevents the car from driving in reverse.
7 Scrub the animation again.
Car motion is improved, but at the last frame the car points at an awkward
angle. This is a common behavior to paths based on a NURBS curve. You
will now correct this problem.
NOTENURBS curves, when used as animation paths, provide a smoother
“ride” than regular splines.
8 Go to the last frame of the animation (frame 150), and make sure the
Point helper is selected.
9 Turn on Auto Key mode.
10 In the Motion panel > Path Parameters rollout > Path Options group >
% Along Path box, type 99.9 and press Enter.
11 Turn off Auto Key and scrub the animation.
The car is properly oriented on the path, but the wheels no longer rotate.
This is because the expression that defined the wheel rotation you
formulated earlier no longer applies. The distance travelled by the car
was dependent on the X and Y displacement in the World coordinate
system. Displacement is now tied to the length of the path and the
630 | Chapter 4 Animation Tutorials
