7-4 Enemy Animation 敌人的动画

夜行的猫仔 · 发表于 2013-10-17 13:13:32

本帖最后由夜行的猫仔于 2014-1-15 11:40 编辑

C#脚本

using UnityEngine;
using System.Collections;
public class EnemyAnimation : MonoBehaviour
{
public float deadZone = 5f; // 不受Mecanim动画系统控制的旋转角度.
private Transform player; // player矩阵变量.
private EnemySight enemySight; // EnemySight脚本变量.
private NavMeshAgent nav; // 寻路脚本变量.
private Animator anim; // Animator变量.
private HashIDs hash; // HashIDs 脚本变量.
private AnimatorSetup animSetup; // 动作设置辅助类变量.
void Awake ()
{
// 初始化
player = GameObject.FindGameObjectWithTag(Tags.player).transform;
enemySight = GetComponent<EnemySight>();
nav = GetComponent<NavMeshAgent>();
anim = GetComponent<Animator>();
hash = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent<HashIDs>();
// 是否被Mecanim动画系统控制标志位.
nav.updateRotation = false;
// 创建AnimatorSetup变量
animSetup = new AnimatorSetup(anim, hash);
// 设置shooting和gun动画层的权重1.
anim.SetLayerWeight(1, 1f);
anim.SetLayerWeight(2, 1f);
// 我们需要将度转化为弧度.
// Mathf.Deg2Rad是一个从角度转化为弧度的常量:deadZone = deadZone*Mathf.Deg2Rad;
deadZone *= Mathf.Deg2Rad;
}
void Update ()
{
// 通过自动寻路系统驱动角色动画.
NavAnimSetup();
}
void OnAnimatorMove ()
{
// 根据动画中移动的位置来设定寻路的速度
nav.velocity = anim.deltaPosition / Time.deltaTime;
// 通过动画旋转值设定角色旋转角度
transform.rotation = anim.rootRotation;
}
void NavAnimSetup ()
{
// 创建两个变量，用于AnimatorSetup设置
float speed;
float angle;
// 如果玩家暴露在敌人的视野里...
if(enemySight.playerInSight)
{
// ... 敌人角色就会停止移动...
speed = 0f;
// ... 并且会将正面转向正对玩家
angle = FindAngle(transform.forward, player.position - transform.position, transform.up);
}
else
{
// 否则速度就等于自动寻路中设定的寻路速度在forward方向上的分量..
// Vector3.Project一个向量向另外一个向量的投影
speed = Vector3.Project(nav.desiredVelocity, transform.forward).magnitude;
// ... 角度是朝向和期望运动间的夹角.
angle = FindAngle(transform.forward, nav.desiredVelocity, transform.up);
// 如果夹角在deadZone之间...
if(Mathf.Abs(angle) < deadZone)
{
// ... set the direction to be along the desired direction and set the angle to be zero.
// transform.LookAt函数将物体的z轴指向目标。
transform.LookAt(transform.position + nav.desiredVelocity);
angle = 0f;
}
}
// 通过上面的计算所得到的值设置动作.
animSetup.Setup(speed, angle);
}
float FindAngle (Vector3 fromVector, Vector3 toVector, Vector3 upVector)
{
// 如果toVector是 0...
if(toVector == Vector3.zero)
// ... 他们之间的角度是 0.
return 0f;
// Create a float to store the angle between the facing of the enemy and the direction it's travelling.
// 创建一个浮点数记录从fromVector到toVector之间的夹角。(这个夹角是敌人面朝的方向和移动的方向之间的)
float angle = Vector3.Angle(fromVector, toVector);
// Find the cross product of the two vectors (this will point up if the velocity is to the right of forward).
// 求得两个向量的叉乘(求fromVector和toVector两个向量的法线)
Vector3 normal = Vector3.Cross(fromVector, toVector);
// The dot product of the normal with the upVector will be positive if they point in the same direction.
// 与upVector点乘的结果来判断他们是否指向同一方向。
angle *= Mathf.Sign(Vector3.Dot(normal, upVector));
// 角度转化为弧度
angle *= Mathf.Deg2Rad;
return angle;
}
}

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JS脚本

#pragma strict
public var deadZone : float = 5f; // The number of degrees for which the rotation isn't controlled by Mecanim.
private var player : Transform; // Reference to the player's transform.
private var enemySight : EnemySight; // Reference to the EnemySight script.
private var nav : NavMeshAgent; // Reference to the nav mesh agent.
private var anim : Animator; // Reference to the Animator.
private var hash : HashIDs; // Reference to the HashIDs script.
private var animSetup : AnimatorSetup; // An instance of the AnimatorSetup helper class.
function Awake ()
{
// Setting up the references.
player = GameObject.FindGameObjectWithTag(Tags.player).transform;
enemySight = GetComponent(EnemySight);
nav = GetComponent(NavMeshAgent);
anim = GetComponent(Animator);
hash = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent(HashIDs);
// Making sure the rotation is controlled by Mecanim.
nav.updateRotation = false;
// Creating an instance of the AnimatorSetup class and calling it's constructor.
animSetup = new AnimatorSetup(anim, hash);
// Set the weights for the shooting and gun layers to 1.
anim.SetLayerWeight(1, 1f);
anim.SetLayerWeight(2, 1f);
// We need to convert the angle for the deadzone from degrees to radians.
deadZone *= Mathf.Deg2Rad;
}
function Update ()
{
// Calculate the parameters that need to be passed to the animator component.
NavAnimSetup();
}
function OnAnimatorMove ()
{
// Set the NavMeshAgent's velocity to the change in position since the last frame, by the time it took for the last frame.
nav.velocity = anim.deltaPosition / Time.deltaTime;
// The gameobject's rotation is driven by the animation's rotation.
transform.rotation = anim.rootRotation;
}
function NavAnimSetup ()
{
// Create the parameters to pass to the helper function.
var speed : float;
var angle : float;
// If the player is in sight...
if(enemySight.playerInSight)
{
// ... the enemy should stop...
speed = 0f;
// ... and the angle to turn through is towards the player.
angle = FindAngle(transform.forward, player.position - transform.position, transform.up);
}
else
{
// Otherwise the speed is a projection of desired velocity on to the forward vector...
speed = Vector3.Project(nav.desiredVelocity, transform.forward).magnitude;
// ... and the angle is the angle between forward and the desired velocity.
angle = FindAngle(transform.forward, nav.desiredVelocity, transform.up);
// If the angle is within the deadZone...
if(Mathf.Abs(angle) < deadZone)
{
// ... set the direction to be along the desired direction and set the angle to be zero.
transform.LookAt(transform.position + nav.desiredVelocity);
angle = 0f;
}
}
// Call the Setup function of the helper class with the given parameters.
animSetup.Setup(speed, angle);
}
function FindAngle (fromVector : Vector3, toVector : Vector3, upVector : Vector3) : float
{
// If the vector the angle is being calculated to is 0...
if(toVector == Vector3.zero)
// ... the angle between them is 0.
return 0f;
// Create a float to store the angle between the facing of the enemy and the direction it's travelling.
var angle : float = Vector3.Angle(fromVector, toVector);
// Find the cross product of the two vectors (this will point up if the velocity is to the right of forward).
var normal : Vector3 = Vector3.Cross(fromVector, toVector);
// The dot product of the normal with the upVector will be positive if they point in the same direction.
angle *= Mathf.Sign(Vector3.Dot(normal, upVector));
// We need to convert the angle we've found from degrees to radians.
angle *= Mathf.Deg2Rad;
return angle;
}

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相关知识：
NavMeshAgent 自动寻路控制组件

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7-4 Enemy Animation 敌人的动画

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