Unity3D之Mecanim動畫系統學習筆記（六）：使用腳本控制動畫

控制人物動畫播放

這里我重新弄了一個簡單的場景和新的Animator Controller來作為示例。

下面先看看Animator Controller的配置：

人物在站立狀態只能進入走路，走路只能進入奔跑或返回站立，奔跑只能進入跳躍或返回走路，跳躍則只能返回奔跑。

參數方面為兩個參數：

• Float類型的moveSpeed；
• Trigger類型的Jump；

連線直接的轉換條件為：moveSpeed大於0.1進入走路，走路moveSpeed大於0.9進入奔跑小於0.1返回站立，奔跑moveSpeed小於0.9返回走路，Jump被觸發則進入跳躍；

為人物添加Animator組件並綁定上面的Animator Controller文件，同時綁定下面的腳本：

using UnityEngine;
using System.Collections;

public class TestAnim : MonoBehaviour
{
    //將名稱轉換為哈希值可以提高索引的速度
    private int moveSpeed = Animator.StringToHash("moveSpeed");
    private int jump = Animator.StringToHash("Jump");
    private int runState = Animator.StringToHash("Base Layer.Run");

    private Animator _animator;

    void Start()
    {
        _animator = this.GetComponent<Animator>();
    }
    
    void Update()
    {
        float speed = Input.GetAxis("Vertical");
        _animator.SetFloat(moveSpeed, speed);

        //獲取動畫的當前狀態
        AnimatorStateInfo info = _animator.GetCurrentAnimatorStateInfo(0);
        //跳躍除了要按下空格鍵外, 還需要處於奔跑狀態才行, 否則按下空格鍵時就會標記 Jump, 一進入奔跑就馬上跳躍
        if(Input.GetKeyDown(KeyCode.Space) && info.fullPathHash == runState)
        {
            _animator.SetTrigger(jump);
        }
    }
}

State Machine Behavior

在Unity5.0中，我們可以給Animator Controller中的每個State添加腳本了，類似於專門用於GameObject的MonoBehavior，State可以添加State Machine Behavior，我們打開任意的Animator Controller，就可以在Inspector窗口發現添加腳本的按鈕：

除了State外，我們還可以在層上添加，層可以看做包含了整個State的一個大State：

我們可以添加一個腳本看看，下面是我添加了注釋的State Machine Behavior腳本的標准形式：

using UnityEngine;
using System.Collections;

public class StateScript : StateMachineBehaviour
{
    // OnStateEnter is called before OnStateEnter is called on any state inside this state machine
    override public void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        //進入當前狀態時會被調用
    }

    // OnStateUpdate is called before OnStateUpdate is called on any state inside this state machine
    override public void OnStateUpdate(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        //進入當前狀態的每幀會被調用
    }

    // OnStateExit is called before OnStateExit is called on any state inside this state machine
    override public void OnStateExit(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        //退出當前狀態時會被調用
    }

    // OnStateMove is called before OnStateMove is called on any state inside this state machine
    override public void OnStateMove(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
    }

    // OnStateIK is called before OnStateIK is called on any state inside this state machine
    override public void OnStateIK(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
    }

    // OnStateMachineEnter is called when entering a statemachine via its Entry Node
    override public void OnStateMachineEnter(Animator animator, int stateMachinePathHash)
    {
    }

    // OnStateMachineExit is called when exiting a statemachine via its Exit Node
    override public void OnStateMachineExit(Animator animator, int stateMachinePathHash)
    {
    }
}

通過使用State Machine Behaviour我們可以更加方便的在特定的時間點觸發一些我們需要的事件，但是需要注意的是，我們一般給State Machine Behaviour賦值一些場景的對象不是直接在Inspector面板里拖拽而是通過Animator的GetBehavior方法獲取到指定的State Machine Behaviour的實例后通過腳本進行賦值的。