ResourceRequest 资源请求

从资源包异步加载请求。

    using UnityEngine;
    using System.Collections;
    public class ExampleClass : MonoBehaviour {
        void Start() {
            StartCoroutine(LoadTexture());
        }
        IEnumerator LoadTexture() {
            GameObject go = GameObject.CreatePrimitive(PrimitiveType.Cube);
            ResourceRequest request = Resources.LoadAsync<Texture2D>("glass");
            yield return request;
            go.renderer.material.mainTexture = request.asset;
        }
    }

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