在之前的几篇Blog总，我们已经系统学习了自动寻路插件Navmesh的相关概念和细节。然而，如果要做一个场景精美的手游，需要用到各种复杂的场景地形，而不仅仅是平地上的自动寻路。今天我们将通过一个完整的复杂的实例，来贯穿各个细节。我们将实现一个复杂的场景，角色可以在里面攀爬，跳跃，爬坡。是不是感觉很像当年的CS游戏呢？本案例将会用得一些基本的动画函数，大家可以先结合文档有个大概的了解。本实例是在官方的范例上加工而成。
（转载请注明原文地址http://blog.csdn.net/janeky/article/details/17598113）
using UnityEngine; using System.Collections; public class AgentLocomotion : MonoBehaviour { private Vector3 target;//目标位置 private NavMeshAgent agent; private Animation anim;//动画 private string locoState = "Locomotion_Stand"; private Vector3 linkStart;//OffMeshLink的开始点 private Vector3 linkEnd;//OffMeshLink的结束点 private Quaternion linkRotate;//OffMeshLink的旋转 private bool begin;//是否开始寻路 // Use this for initialization void Start() { agent = GetComponent<NavMeshAgent>(); //自动移动并关闭OffMeshLinks,即在两个隔离障碍物直接生成的OffMeshLink，agent不会自动越过 agent.autoTraverseOffMeshLink = false; //创建动画 AnimationSetup(); //起一个协程，处理动画状态机 StartCoroutine(AnimationStateMachine()); } void Update() { //鼠标左键点击 if (Input.GetMouseButtonDown(0)) { //摄像机到点击位置的的射线 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); RaycastHit hit; if (Physics.Raycast(ray, out hit)) { //判断点击的是否地形 if (hit.collider.tag.Equals("Obstacle")) { begin = true; //点击位置坐标 target = hit.point; } } } //每一帧，设置目标点 if (begin) { agent.SetDestination(target); } } IEnumerator AnimationStateMachine() { //根据locoState不同的状态来处理，调用相关的函数 while (Application.isPlaying) { yield return StartCoroutine(locoState); } } //站立 IEnumerator Locomotion_Stand() { do { UpdateAnimationBlend(); yield return new WaitForSeconds(0); } while (agent.remainingDistance == 0); //未到达目标点，转到下一个状态Locomotion_Move locoState = "Locomotion_Move"; yield return null; } IEnumerator Locomotion_Move() { do { UpdateAnimationBlend(); yield return new WaitForSeconds(0); //角色处于OffMeshLink，根据不同的地点，选择不同动画 if (agent.isOnOffMeshLink) { locoState = SelectLinkAnimation(); return (true); } } while (agent.remainingDistance != 0); //已经到达目标点，状态转为Stand locoState = "Locomotion_Stand"; yield return null; } IEnumerator Locomotion_Jump() { //播放跳跃动画 string linkAnim = "RunJump"; Vector3 posStart = transform.position; agent.Stop(true); anim.CrossFade(linkAnim, 0.1f, PlayMode.StopAll); transform.rotation = linkRotate; do { //计算新的位置 float tlerp = anim[linkAnim].normalizedTime; Vector3 newPos = Vector3.Lerp(posStart, linkEnd, tlerp); newPos.y += 0.4f * Mathf.Sin(3.14159f * tlerp); transform.position = newPos; yield return new WaitForSeconds(0); } while (anim[linkAnim].normalizedTime < 1); //动画恢复到Idle anim.Play("Idle"); agent.CompleteOffMeshLink(); agent.Resume(); //下一个状态为Stand transform.position = linkEnd; locoState = "Locomotion_Stand"; yield return null; } //梯子 IEnumerator Locomotion_Ladder() { //梯子的中心位置 Vector3 linkCenter = (linkStart + linkEnd) * 0.5f; string linkAnim; //判断是在梯子上还是梯子下 if (transform.position.y > linkCenter.y) linkAnim = "Ladder Down"; else linkAnim = "Ladder Up"; agent.Stop(true); Quaternion startRot = transform.rotation; Vector3 startPos = transform.position; float blendTime = 0.2f; float tblend = 0f; //角色的位置插值变化（0.2内变化） do { transform.position = Vector3.Lerp(startPos, linkStart, tblend / blendTime); transform.rotation = Quaternion.Lerp(startRot, linkRotate, tblend / blendTime); yield return new WaitForSeconds(0); tblend += Time.deltaTime; } while (tblend < blendTime); //设置位置 transform.position = linkStart; //播放动画 anim.CrossFade(linkAnim, 0.1f, PlayMode.StopAll); agent.ActivateCurrentOffMeshLink(false); //等待动画结束 do { yield return new WaitForSeconds(0); } while (anim[linkAnim].normalizedTime < 1); agent.ActivateCurrentOffMeshLink(true); //恢复Idle状态 anim.Play("Idle"); transform.position = linkEnd; agent.CompleteOffMeshLink(); agent.Resume(); //下一个状态Stand locoState = "Locomotion_Stand"; yield return null; } private string SelectLinkAnimation() { //获得当前的OffMeshLink数据 OffMeshLinkData link = agent.currentOffMeshLinkData; //计算角色当前是在link的开始点还是结束点（因为OffMeshLink是双向的） float distS = (transform.position - link.startPos).magnitude; float distE = (transform.position - link.endPos).magnitude; if (distS < distE) { linkStart = link.startPos; linkEnd = link.endPos; } else { linkStart = link.endPos; linkEnd = link.startPos; } //OffMeshLink的方向 Vector3 alignDir = linkEnd - linkStart; //忽略y轴 alignDir.y = 0; //计算旋转角度 linkRotate = Quaternion.LookRotation(alignDir); //判断OffMeshLink是手动的（楼梯）还是自动生成的（跳跃） if (link.linkType == OffMeshLinkType.LinkTypeManual) { return ("Locomotion_Ladder"); } else { return ("Locomotion_Jump"); } } private void AnimationSetup() { anim = GetComponent<Animation>(); // 把walk和run动画放到同一层，然后同步他们的速度。 anim["Walk"].layer = 1; anim["Run"].layer = 1; anim.SyncLayer(1); //设置“跳跃”，“爬楼梯”，“下楼梯”的动画模式和速度 anim["RunJump"].wrapMode = WrapMode.ClampForever; anim["RunJump"].speed = 2; anim["Ladder Up"].wrapMode = WrapMode.ClampForever; anim["Ladder Up"].speed = 2; anim["Ladder Down"].wrapMode = WrapMode.ClampForever; anim["Ladder Down"].speed = 2; //初始化动画状态为Idle anim.CrossFade("Idle", 0.1f, PlayMode.StopAll); } //更新动画融合 private void UpdateAnimationBlend() { //行走速度 float walkAnimationSpeed = 1.5f; //奔跑速度 float runAnimationSpeed = 4.0f; //速度阀值（idle和walk的临界点） float speedThreshold = 0.1f; //速度，只考虑x和z Vector3 velocityXZ = new Vector3(agent.velocity.x, 0.0f, agent.velocity.z); //速度值 float speed = velocityXZ.magnitude; //设置Run动画的速度 anim["Run"].speed = speed / runAnimationSpeed; //设置Walk动画的速度 anim["Walk"].speed = speed / walkAnimationSpeed; //根据agent的速度大小，确定animation的播放状态 if (speed > (walkAnimationSpeed + runAnimationSpeed) / 2) { anim.CrossFade("Run"); } else if (speed > speedThreshold) { anim.CrossFade("Walk"); } else { anim.CrossFade("Idle", 0.1f, PlayMode.StopAll); } } }
今天的这个例子比较复杂，要根据寻路网格的类型，来处理角色的动作是普通寻路，还是攀爬，抑或跳跃。这个例子应该是比较接近真实项目了。大家在实际项目中如果还有更加复杂的寻路，欢迎探讨。ken@iamcoding.com
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