How To Program Your Own AI

To set up your own AI, simply replace the CarAISimple component on the "Car" GameObject with your own AI script. The CarAISimple.cs script is a good example to see how to properly hook into all of the interfaces.

Example Simple AI: CarAISimple.cs

using UnityEngine;
using System.Collections;

public class CarAISimple : MonoBehaviour {
	public Car car;
	public CarDataCollection carData;
	public GameObject targetNode; //used for pathfinding
	void Update() {
		float steer = 0.0f;
		float throttle = 0.0f;
		Vector3 distanceVector = targetNode.transform.position-this.transform.position;
		if(distanceVector.magnitude>1) //if we haven't reached the goal
		{
			Vector3 currentDirection = this.transform.forward;
			float angle = CalculateAngle(distanceVector,currentDirection);
			if(Mathf.Abs(angle)<5) //already going the correct direction
			{
				steer = 0.0f;
			}
			else if(angle<0) // we are aiming to the right of the target
			{
				steer = 1.0f;
			}
			else //we are aiming to the left of the target
			{
				steer = -1.0f;
			}
			throttle=1.0f;
		}
		car.ProcessAICommands(throttle, steer);
	}
	
	void OnTriggerEnter(Collider theCollision)
	{
		targetNode = theCollision.GetComponent<RoadNode>().nextNode;
	}
	float CalculateAngle(Vector3 forwardVector, Vector3 targetVector)
	{
		Vector3 rightVector = Vector3.Cross(Vector3.up, forwardVector);
		//this calculates the angel between vectors, but only between 0-180
		float angle = Vector3.Angle(forwardVector, targetVector);
		//calculate whether it is on the left or the right
		int sign = (Vector3.Dot(targetVector, rightVector) > 0.0f) ? 1: -1;
		return sign*angle;
	}
}

Example Ping Sensor AI CarAISimple.cs

using UnityEngine;
using System.Collections;

public class CarAISimple : MonoBehaviour
{
	public Car car;
	public CarDataCollection carData;
	public GameObject targetNode; //used for pathfinding
	void Update ()
	{
		float steer = 0.0f;
		float throttle = 0.0f;
		Vector3 distanceVector = targetNode.transform.position - this.transform.position;
		print (carData.fwdPing);
		
		if (distanceVector.magnitude > 1) { //if we haven't reached the goal
			Vector3 currentDirection = this.transform.forward;
			float angle = CalculateAngle (distanceVector, currentDirection);
			//throttle=0.75f;
			
			
			if (Mathf.Abs (angle) < 5) { //already going the correct direction
				steer = 0.0f;
				throttle = 0.75f;
				if (carData.fwdPing < 3.0) {
					throttle = 0;
				}
				
			} else if (angle < 0) { // we are aiming to the right of the target
				steer = 1.0f;
				throttle = 0.5f;
			} else { //we are aiming to the left of the target
				steer = -1.0f;
				throttle = 0.5f;
			}
			
		}
		car.ProcessAICommands (throttle, steer);
	}
	
	void OnTriggerEnter (Collider theCollision)
	{
		targetNode = theCollision.GetComponent<RoadNode> ().nextNode;
	}

	float CalculateAngle (Vector3 forwardVector, Vector3 targetVector)
	{
		Vector3 rightVector = Vector3.Cross (Vector3.up, forwardVector);
		//this calculates the angel between vectors, but only between 0-180
		float angle = Vector3.Angle (forwardVector, targetVector);
		//calculate whether it is on the left or the right
		int sign = (Vector3.Dot (targetVector, rightVector) > 0.0f) ? 1 : -1;
		return sign * angle;
	}
}