Driving - Unity AI Programming Essentials - page 117

Setting up a Smart Car vehicle
As Smart Car uses a realistic car setup, there are many options to configure your
vehicle. To create a Smart Car vehicle, you'll need a car model with different models
for wheels and Unity wheel colliders setup on them. After adding a car model to your
scene, import the Smart Car 2.3 package and attach the SmartAICar2_3.cs script
from SmartAICar2.3/Scripts . In the following screenshot, you can see some of
the Smart Car AI fields from the script:
There are fields here you can customize such as Engine properties, including Engine
Torque Curve , and the distances for the ray casts used for sensing. Most of these
can be left to default values, but to run the script, you'll need to fill in the wheel prop-
erties, dragging from your model the colliders for the four wheels to the Wheel_FL ,
Wheel_FR , Wheel_RL , and Wheel_RR properties. You also need transforms for the
wheel set. Also, there needs to be a transform for center of mass ( COM ), a lower
point in the middle of the car. If COM is placed in the wrong position, the physics of
the car can be very unexpected. If you fill these out, the car is set up but it still won't
run in a game as it still needs waypoints and a Unity navigation mesh setup, which we
will add in the demo.