美术制作的3D模型动画文件，没有很好的预览手段，往往需要手动创建Animator,然后再拖对应的动画文件到State中，在模型动画数量增多的时候，手动处理这些问题往往是耗时低效的。所以就有了制作模型动画查看器的需求。
基本的思路为读取模型文件，创建Animation Controller, 将动画文件添加到Animation Controller的Layer，并建立不同状态间的Transition. 代码如下:
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| using UnityEngine;
using System.Collections;
using UnityEditor;
using UnityEditorInternal;
using System.IO;
using System.Collections.Generic;
public class AnimationViewer : Editor
{
private static string ModelPath = Application.dataPath + "/Model";
private static string animationControllerPath = "Assets/AnimationController";
private static string PrefabPath = "Assets/Resources/Prefabs";
private static string FileName = "ModelNames";
private static StreamWriter writer;
static void DoCreateAnimationAssets ()
{
//获得模型动画所在文件夹
DirectoryInfo raw = new DirectoryInfo (ModelPath);
string appendString = "";
//遍历模型动画文件夹
foreach (DirectoryInfo dictory in raw.GetDirectories())
{
appendString += ":" + dictory.Name;
State lastState = null;
//生成AnimationController
AnimatorController animatorController = AnimatorController.CreateAnimatorControllerAtPath (animationControllerPath + "/" + dictory.Name + ".controller");
//得到AnimationController的Layer， 默认layer为base
AnimatorControllerLayer layer = animatorController.GetLayer (0);
List<State> stateList = new List<State>();
foreach (FileInfo file in dictory.GetFiles()) {
//动画名称遵循"模型名@动画名"的规则，并除去.meta文件
if (file.Name.Contains ("@") && !file.Name.Contains (".meta")) {
//把动画文件保存在我们创建的AnimationController中，并与上一个动画状态做Transition.
string fbxPath = "Assets/Model/" + dictory.Name + "/" + file.Name;
lastState = AddStateTransition (fbxPath, layer, lastState);
stateList.Add(lastState);
}
}
UnityEditorInternal.StateMachine sm = layer.stateMachine;
//首位详解，形成一个循环播放的效果
sm.AddTransition(stateList[stateList.Count -1], stateList[0]);
//保存为Prefab
BuildPrefab (dictory, animatorController);
}
AppendString (appendString);
}
static void AppendString (string appendString)
{
//记录所有的模型名称
File.WriteAllText (Application.dataPath + "/Resources/" + FileName + ".txt", appendString);
}
private static State AddStateTransition (string path, AnimatorControllerLayer layer, State lastState)
{
UnityEditorInternal.StateMachine sm = layer.stateMachine;
//根据动画文件读取它的AnimationClip对象
AnimationClip newClip = AssetDatabase.LoadAssetAtPath (path, typeof(AnimationClip)) as AnimationClip;
AnimationUtility.SetAnimationType (newClip, ModelImporterAnimationType.Generic);
//取出动画名子 添加到state里面
State state = sm.AddState (newClip.name);
state.SetAnimationClip (newClip, layer);
//把state添加在layer里面
if (lastState ！= null)
{
sm.AddTransition (lastState, state);
}
return state;
}
private static void BuildPrefab (DirectoryInfo dictory, AnimatorController animatorCountorller)
{
string modelPath = "Assets/Model/" + dictory.Name + "/" + dictory.Name + ".FBX";
GameObject go = AssetDatabase.LoadAssetAtPath (modelPath, typeof(GameObject)) as GameObject;
go.name = dictory.Name;
Animator animator = go.GetComponent<Animator> ();
animator.runtimeAnimatorController = animatorCountorller;
PrefabUtility.CreatePrefab (PrefabPath + "/" + go.name + ".prefab", go);
}
}
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