01 Unity3D人工智能AI-靠近

本文固定连接：http://blog.csdn.net/u013108312/article/details/52892210

1.新建场景
2.创建一个目标点
3.添加角色，添加Character Controller,AILocomotion.cs和SteeringForSeek.cs

using UnityEngine;using System.Collections;public abstract class Steering : MonoBehaviour {    public float weight = 1;    public virtual Vector3 Force()    {        return new Vector3(0,0,0);    }}

using UnityEngine;using System.Collections;//using System.Collections.Generic;public class Vehicle : MonoBehaviour {    private Steering[] steerings;    public float maxSpeed = 10;    public float maxForce = 100;    protected float sqrMaxSpeed;    public float mass = 1;    public Vector3 velocity;    public float damping = 0.9f;    public float computeInterval = 0.2f;    public bool isPlanar = true;    private Vector3 steeringForce;    protected Vector3 acceleration;    //private CharacterController controller;    //private Rigidbody theRigidbody;    //private Vector3 moveDistance;    private float timer;    protected void Start ()     {        steeringForce = new Vector3(0,0,0);        sqrMaxSpeed = maxSpeed * maxSpeed;        //moveDistance = new Vector3(0,0,0);        timer = 0;        steerings = GetComponents<Steering>();        //controller = GetComponent<CharacterController>();        //theRigidbody = GetComponent<Rigidbody>();    }    void Update ()     {        timer += Time.deltaTime;        steeringForce = new Vector3(0,0,0);          //ticked part, we will not compute force every frame        if (timer > computeInterval)        {            foreach (Steering s in steerings)            {                if (s.enabled)                    steeringForce += s.Force()*s.weight;            }            steeringForce = Vector3.ClampMagnitude(steeringForce,maxForce);            acceleration = steeringForce / mass;            timer = 0;        }    }    /*    void FixedUpdate()    {        velocity += acceleration * Time.fixedDeltaTime;         if (velocity.sqrMagnitude > sqrMaxSpeed)            velocity = velocity.normalized * maxSpeed;        moveDistance = velocity * Time.fixedDeltaTime;        if (isPlanar)            moveDistance.y = 0;        if (controller != null)            controller.SimpleMove(velocity);        else if (theRigidbody == null || theRigidbody.isKinematic)            transform.position += moveDistance;        else            theRigidbody.MovePosition(theRigidbody.position + moveDistance);                //updata facing direction        if (velocity.sqrMagnitude > 0.00001)        {            Vector3 newForward = Vector3.Slerp(transform.forward, velocity, damping * Time.deltaTime);            newForward.y = 0;            transform.forward = newForward;        }    }*/}

using UnityEngine;using System.Collections;public class AILocomotion : Vehicle {    private CharacterController controller;    private Rigidbody theRigidbody;    private Vector3 moveDistance;    public bool displayTrack;    // Use this for initialization    void Start ()     {        controller = GetComponent<CharacterController>();        theRigidbody = GetComponent<Rigidbody>();        moveDistance = new Vector3(0,0,0);        base.Start();    }    void FixedUpdate()    {        velocity += acceleration * Time.fixedDeltaTime;         if (velocity.sqrMagnitude > sqrMaxSpeed)            velocity = velocity.normalized * maxSpeed;        moveDistance = velocity * Time.fixedDeltaTime;        if (isPlanar)        {            velocity.y = 0;            moveDistance.y = 0;        }        if (displayTrack)            //Debug.DrawLine(transform.position, transform.position + moveDistance, Color.red,30.0f);            Debug.DrawLine(transform.position, transform.position + moveDistance, Color.black, 30.0f);        if (controller != null)        {            //if (displayTrack)                //Debug.DrawLine(transform.position, transform.position + moveDistance, Color.blue,20.0f);            controller.SimpleMove(velocity);        }        else if (theRigidbody == null || theRigidbody.isKinematic)        {            transform.position += moveDistance;        }        else        {            theRigidbody.MovePosition(theRigidbody.position + moveDistance);                }        //updata facing direction        if (velocity.sqrMagnitude > 0.00001)        {            Vector3 newForward = Vector3.Slerp(transform.forward, velocity, damping * Time.deltaTime);            if (isPlanar)                newForward.y = 0;            transform.forward = newForward;        }        //gameObject.animation.Play("walk");    }}

using UnityEngine;using System.Collections;public class SteeringForSeek : Steering {    public GameObject target;    private Vector3 desiredVelocity;    private Vehicle m_vehicle;    private float maxSpeed;    private bool isPlanar;    void Start () {        m_vehicle = GetComponent<Vehicle>();        maxSpeed = m_vehicle.maxSpeed;        isPlanar = m_vehicle.isPlanar;    }    public override Vector3 Force()    {        desiredVelocity = (target.transform.position - transform.position).normalized * maxSpeed;        if (isPlanar)            desiredVelocity.y = 0;        return (desiredVelocity - m_vehicle.velocity);    }}