AI运动的基类

using UnityEngine;
using System.Collections;

public class Vehicle : MonoBehaviour 
{
    //行为列表
    private Steering[] steerings;
    //这个AI角色的最大速度
    public float maxSpeed = 10;
    //这个AI角色的最大力
    public float maxForce = 100;
    //速度平方提前存起来节省资源
    protected float sqrMaxSpeed;
    //质量
    public float mass = 1;
    //速度
    public Vector3 velocity;
    //转向速度
    public Vector3 damping = 0.9f;
    //操纵力的时间间隔
    public float computeInterval = 0.2f;
    //是否在二位平面上，如果在 计算两个GameObject的距离时忽略Y
    public bool isPlanar = true;
    //计算得到的操控力
    private Vector3 steeringForce;
    //加速度
    protected Vector3 acceleration;
    //计时器
    private float timer;

    protected void Start()
    {
        steeringForce = new Vector3 (0,0,0);
        sqrMaxSpeed = maxSpeed * maxSpeed;
        timer = 0;
        steerings = GetComponent<Steering> ();
    }

    void Update ()
    {
        timer += Time.deltaTime;
        steeringForce = new Vector3 (0,0,0);
        if(timer > computeInterval)
        {
            //将所有行为所附加的操纵力求和
            foreach(Steering s in steerings)
            {
                if(s.enabled)
                {
                    steeringForce += s.Force*s.weight;
                }
            }
            steeringForce = Vector3.ClampMagnitude(steeringForce,maxForce);
            acceleration = steeringForce / mass;
            timer = 0;
        }
    }
}