GLTF介绍

简单来说就是方便实时的外部加载模型尤其用在webGL上从服务器获取模型进行加载
官方介绍

下载

GLTFUtility插件下载
 Newtonsoft.Json-for-Unity 下载：插件需要此dll

使用

using Siccity.GLTFUtility;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 加载GLB模型单例
/// </summary>
public class GLTFUtilityScript
{
    private static GLTFUtilityScript instance;
    public static GLTFUtilityScript Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new GLTFUtilityScript();
            }
            return instance;
        }

    }

    Action action;
    public GameObject obj;
    bool isCreate = true;

    /// <summary>
    /// 同步加载 gltf and glb （不建议使用）
    /// </summary>
    /// <param name="filepath">路径</param>
    /// <param name="action">回调函数</param>
    public void ImportGLTF(string filepath, Action action)
    {
        UnloadAndDestroy(obj);
        obj = Importer.LoadFromFile(filepath);
        action = this.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 ImportGLTFAsync(string filepath, Action action)
    {
        if (!isCreate) return;
        isCreate = false;
        UnloadAndDestroy(obj);
        Importer.LoadFromFileAsync(filepath, new ImportSettings(), OnFinishAsync);
        action = this.action;
    }

    public void ImportGLTFAsync(string filepath)
    {
        if (!isCreate) return;
        isCreate = false;
        UnloadAndDestroy(obj);
        Importer.LoadFromFileAsync(filepath, new ImportSettings(), OnFinishAsync);
    }

    public void ImportGLTAsync()
    {
        obj = new GameObject ();
    }

    /// <summary>
    /// 加载完后的回调
    /// </summary>
    /// <param name="result">加载出来的物体</param>
    /// <param name="clip"></param>
    void OnFinishAsync(GameObject result, AnimationClip[] clip)
    {
        obj = 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>
    public void UnloadAndDestroy(GameObject obj)
    {
        if (obj != null)
        {
            GameObject.Destroy(obj);
        }
        Resources.UnloadUnusedAssets();
    }

    ///// <summary>
    ///// 删除卸载 所有加载过的模型 清除缓存
    ///// </summary>
    //public void UnloadAndDestroyALL()
    //{
    //    Resources.UnloadUnusedAssets();

    //}

}