diff --git a/src/DotRecast.Recast.Demo/RecastDemo.cs b/src/DotRecast.Recast.Demo/RecastDemo.cs
index 86f29db..9276659 100644
--- a/src/DotRecast.Recast.Demo/RecastDemo.cs
+++ b/src/DotRecast.Recast.Demo/RecastDemo.cs
@@ -507,40 +507,31 @@ public class RecastDemo
 
         cameraPos[1] += (float)((_moveUp - _moveDown) * keySpeed * dt);
 
-        // long time = Stopwatch.GetTimestamp();
-        // //float dt = (time - prevFrameTime) / TimeSpan.TicksPerMillisecond;
-        // prevFrameTime = time;
-        //
-        // // Update sample simulation.
-        // float SIM_RATE = 20;
-        // float DELTA_TIME = 1.0f / SIM_RATE;
-        // timeAcc = clamp((float)(timeAcc + dt), -1.0f, 1.0f);
-        // int simIter = 0;
-        // while (timeAcc > DELTA_TIME)
-        // {
-        //     timeAcc -= DELTA_TIME;
-        //     if (simIter < 5 && sample != null)
-        //     {
-        //         toolsUI.handleUpdate((float)dt);
-        //     }
-        //
-        //     simIter++;
-        // }
+        long time = Stopwatch.GetTimestamp();
+        // float dt = (time - prevFrameTime) / TimeSpan.TicksPerMillisecond;
+        prevFrameTime = time;
+        
+        // Update sample simulation.
+        float SIM_RATE = 20;
+        float DELTA_TIME = 1.0f / SIM_RATE;
+        timeAcc = clamp((float)(timeAcc + dt), -1.0f, 1.0f);
+        int simIter = 0;
+        while (timeAcc > DELTA_TIME)
+        {
+            timeAcc -= DELTA_TIME;
+            if (simIter < 5 && sample != null)
+            {
+                toolsUI.handleUpdate((float)dt);
+            }
+        
+            simIter++;
+        }
 
-        // if (settingsUI.isMeshInputTrigerred())
-        // {
-        // aFilterPatterns.put(stack.UTF8("*.obj"));
-        // aFilterPatterns.flip();
-        // string filename = TinyFileDialogs.tinyfd_openFileDialog("Open Mesh File", "", aFilterPatterns,
-        //     "Mesh File (*.obj)", false);
-        // if (filename != null) {
-        //     try (InputStream stream = new FileInputStream(filename)) {
-        //         sample.update(loadInputMesh(stream), null, null);
-        //     } catch (IOException e) {
-        //         Console.WriteLine(e).printStackTrace();
-        //     }
-        // }
-        // }
+        if (settingsUI.isMeshInputTrigerred())
+        {
+            var bytes = Loader.ToBytes(settingsUI.GetMeshInputFilePath());
+            sample.update(loadInputMesh(bytes), null, null);
+        }
         // else if (settingsUI.isNavMeshInputTrigerred())
         // {
         // try (MemoryStack stack = stackPush()) {
diff --git a/src/DotRecast.Recast.Demo/Settings/RcSettingsView.cs b/src/DotRecast.Recast.Demo/Settings/RcSettingsView.cs
index b6e570f..6a7694b 100644
--- a/src/DotRecast.Recast.Demo/Settings/RcSettingsView.cs
+++ b/src/DotRecast.Recast.Demo/Settings/RcSettingsView.cs
@@ -68,6 +68,8 @@ public class RcSettingsView : IRcView
 
     private int drawModeIdx = DrawMode.DRAWMODE_NAVMESH.Idx;
     private DrawMode drawMode = DrawMode.DRAWMODE_NAVMESH;
+
+    private string meshInputFilePath;
     private bool meshInputTrigerred;
     private bool navMeshInputTrigerred;
 
@@ -90,14 +92,19 @@ public class RcSettingsView : IRcView
         bool loadSourceGeomPopup = true;
         if (ImGui.BeginPopupModal(strLoadSourceGeom, ref loadSourceGeomPopup, ImGuiWindowFlags.NoTitleBar))
         {
-            var picker = ImFilePicker.GetFilePicker(strLoadSourceGeom, Path.Combine(Environment.CurrentDirectory));
+            var picker = ImFilePicker.GetFilePicker(strLoadSourceGeom, Path.Combine(Environment.CurrentDirectory), ".obj");
             if (picker.Draw())
             {
-                Console.WriteLine(picker.SelectedFile);
+                meshInputTrigerred = true;
+                meshInputFilePath = picker.SelectedFile;
                 ImFilePicker.RemoveFilePicker(strLoadSourceGeom);
             }
             ImGui.EndPopup();
         }
+        else
+        {
+            meshInputTrigerred = false;
+        }
         
         ImGui.Text($"Verts: {voxels[0]} Tris: {voxels[1]}");
         ImGui.NewLine();
@@ -349,6 +356,11 @@ public class RcSettingsView : IRcView
         return meshInputTrigerred;
     }
 
+    public string GetMeshInputFilePath()
+    {
+        return meshInputFilePath;
+    }
+
     public bool isNavMeshInputTrigerred()
     {
         return navMeshInputTrigerred;