경로 선택 탐색기 팝업 기능 구현

- StandaloneFileBrowser 에셋을 활용한 방법
- dll을 활용한 방법
- 유니티 에디터 자체 기능을 활용한 방

Assets/StandaloneFileBrowser/Sample/CanvasSampleOpenFileImage.cs

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+using System.Text;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+using SFB;
+
+[RequireComponent(typeof(Button))]
+public class CanvasSampleOpenFileImage : MonoBehaviour, IPointerDownHandler {
+    public RawImage output;
+
+#if UNITY_WEBGL && !UNITY_EDITOR
+    //
+    // WebGL
+    //
+    [DllImport("__Internal")]
+    private static extern void UploadFile(string gameObjectName, string methodName, string filter, bool multiple);
+
+    public void OnPointerDown(PointerEventData eventData) {
+        UploadFile(gameObject.name, "OnFileUpload", ".png, .jpg", false);
+    }
+
+    // Called from browser
+    public void OnFileUpload(string url) {
+        StartCoroutine(OutputRoutine(url));
+    }
+#else
+    //
+    // Standalone platforms & editor
+    //
+    public void OnPointerDown(PointerEventData eventData) { }
+
+    void Start() {
+        var button = GetComponent<Button>();
+        button.onClick.AddListener(OnClick);
+    }
+
+    private void OnClick() {
+        var paths = StandaloneFileBrowser.OpenFilePanel("Title", "", ".png", false);
+        if (paths.Length > 0) {
+            StartCoroutine(OutputRoutine(new System.Uri(paths[0]).AbsoluteUri));
+        }
+    }
+#endif
+
+    private IEnumerator OutputRoutine(string url) {
+        var loader = new WWW(url);
+        yield return loader;
+        output.texture = loader.texture;
+    }
+}