在统一中徘徊的AI

Question

我在尝试创造一个游荡的人工智能。我使用统一标准资产第三方人工智能，但问题是AI只是移动到某个点，它不能在这些点之间巡逻

下面是代码：

using System;
using UnityEngine;

namespace UnityStandardAssets.Characters.ThirdPerson
{
    [RequireComponent(typeof (UnityEngine.AI.NavMeshAgent))]
    [RequireComponent(typeof (ThirdPersonCharacter))]
    public class AICharacterControl : MonoBehaviour
    {
        // the navmesh agent required for the path finding
        public UnityEngine.AI.NavMeshAgent agent { get; private set; }
        // the character we are controlling                    
        public ThirdPersonCharacter character { get; private set; }
        // target to aim for
        public Transform target;

        private void Start()
        {
            // get the components on the object we need (should not be null
            // due to require component so no need to check)
            agent = GetComponentInChildren<UnityEngine.AI.NavMeshAgent>();
            character = GetComponent<ThirdPersonCharacter>();

            agent.updateRotation = false;
            agent.updatePosition = true;
        }

        private void Update()
        {
            if (target != null)
                agent.SetDestination(target.position);

            if (agent.remainingDistance > agent.stoppingDistance)
                character.Move(agent.desiredVelocity, false, false);
            else
                character.Move(Vector3.zero, false, false);
        }

        public void SetTarget(Transform target)
        {
            this.target = target;
        }
    }
}

我怎样才能修改它来巡逻？

Answer 1

要在两个点之间进行AI巡逻，您需要定义第二个点，并改变AI的行为，以便在到达第一个点时改变目标。目前，一旦它到达目标(即停止)，它将以零速度移动。

在不过多修改代码的情况下，您可以通过这样的操作将代码扩展到两个位置之间。

using System;
using UnityEngine;

namespace UnityStandardAssets.Characters.ThirdPerson
{
    [RequireComponent(typeof (UnityEngine.AI.NavMeshAgent))]
    [RequireComponent(typeof (ThirdPersonCharacter))]
    public class AICharacterControl : MonoBehaviour
    {
        // the navmesh agent required for the path finding
        public UnityEngine.AI.NavMeshAgent agent { get; private set; }
        // the character we are controlling
        public ThirdPersonCharacter character { get; private set; } 
        public Transform start;
        public Transform end;
        
        private Transform target;
        private boolean forward = true;
    
        private void Start()
        {
            // get the components on the object we need ( should not be null
            // due to require component so no need to check )
            agent = GetComponentInChildren<UnityEngine.AI.NavMeshAgent>();
            character = GetComponent<ThirdPersonCharacter>();
    
            agent.updateRotation = false;
            agent.updatePosition = true;
        }
    
        private void Update()
        {
            if (target != null)
                agent.SetDestination(target.position);
    
            if (agent.remainingDistance > agent.stoppingDistance)
            {
                character.Move(agent.desiredVelocity, false, false);
            }
            else
            {
                SetTarget(forward ? start : end);
                forward = !forward;
            }
        }
    
        public void SetTarget(Transform target)
        {
            this.target = target;
        }
    }
}

正如您所看到的，我已经修改了Update()，让AI在离当前目标太近的情况下改变目标。还有一个额外的转换定义(start)在顶部需要设置，和一个boolean用来存储哪个方向的人工智能正在进行。

这段代码还没有在Unity中进行测试，因此可能需要进行一些修改，但它应该会给您正确的想法。