Unity3D 动态加载本地/网络GLB模型

/// <summary>
/// 加载GLB/GLTF模型
/// </summary>
public class LoadGLB_GLTFUtility :MonoBehaviour
{Action action;public GameObject ObjOfImport;bool isCreate = true;private static LoadGLB_GLTFUtility instance;public static LoadGLB_GLTFUtility Instance{get{if (instance == null){GameObject obj = new GameObject();obj.name = "LoadGLBUtility";instance = obj.AddComponent<LoadGLB_GLTFUtility>();}return instance;}}/// <summary>/// 导入网络glb资源/// </summary>/// <param name="url">模型路径</param>/// <param name="action">导入完成事件</param>public void  ImportGLB_GLTFAsyncByWed(string url, Action action){StartCoroutine(DownLoadFile(url, action));}/// <summary>/// 导入网络glb资源/// </summary>/// <param name="url">路径</param>public void ImportGLBAsyncByWed(string url){StartCoroutine(DownLoadFile(url, null));}/// <summary>/// 下载网络资源到本地/// </summary>/// <param name="url"></param>/// <returns></returns>IEnumerator DownLoadFile(string url,Action action){yield return new WaitForSeconds(0.5f);string directoryPath = Application.persistentDataPath + "/FileCache";if (!Directory.Exists(directoryPath)){Directory.CreateDirectory(directoryPath);}string downloadFileName = url.Substring(url.LastIndexOf('/') + 1);string localpath = directoryPath + "/" + downloadFileName;Debug.Log(downloadFileName);//如果本地文件已存在 直接加载if (File.Exists(localpath)){ImportGLB_GLTFAsync(localpath, action);yield break;}UnityWebRequest webRequest = UnityWebRequest.Get(url);webRequest.timeout = 60;yield return webRequest.SendWebRequest();if (webRequest.isNetworkError){Debug.Log("Download Error: " + webRequest.error);if (File.Exists(localpath)){File.Delete(localpath);}}else{var file = webRequest.downloadHandler.data;FileStream nFile = new FileStream(localpath, FileMode.Create);nFile.Write(file, 0, file.Length);nFile.Close();ImportGLB_GLTFAsync(localpath, action);}}/// <summary>/// 异步加载 gltf and glb/// </summary>/// <param name="filepath">路径</param>/// <param name="action">回调函数</param>public void ImportGLB_GLTFAsync(string filepath, Action action){if (!isCreate) return;isCreate = false;UnloadAndDestroy(ObjOfImport);Importer.LoadFromFileAsync(filepath, new ImportSettings(), OnFinishAsync);this.action = action;}/// <summary>///异步加载模型/// </summary>/// <param name="filepath"><路径/param>public void ImportGLB_GLTFAsync(string filepath){if (!isCreate) return;isCreate = false;UnloadAndDestroy(ObjOfImport);Importer.LoadFromFileAsync(filepath, new ImportSettings(), OnFinishAsync);}/// <summary>/// 完成加载/// </summary>/// <param name="result">加载出来的物体</param>/// <param name="clip">加载的动画</param>/// <param name="transform"></param>/// <param name="name"></param>void OnFinishAsync(GameObject result, AnimationClip[] clip, Transform loadpos, string sign){ObjOfImport = result;isCreate = true;Debug.Log("Finished importing " + result.name);if (action != null)action();}/// <summary>/// 删除卸载 所有加载过的模型 清除缓存/// </summary>/// <param name="obj"></param>public void UnloadAndDestroy(GameObject obj){if (obj != null){GameObject.Destroy(obj);}Resources.UnloadUnusedAssets();}}