Add built-in HelixViewer for 3d models

QuickLook.Plugin/QuickLook.Plugin.HelixViewer/HelixPanel.xaml.cs

@@ -0,0 +1,55 @@
+// Copyright © 2017-2025 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using HelixToolkit.Wpf;
+using System.Linq;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Media.Media3D;
+
+namespace QuickLook.Plugin.HelixViewer;
+
+public partial class HelixPanel : UserControl
+{
+    private string _path;
+
+    public HelixPanel(string path) : this()
+    {
+        _path = path;
+        Load();
+    }
+
+    public HelixPanel()
+    {
+        InitializeComponent();
+    }
+
+    private void Load()
+    {
+        var modelImporter = new ModelImporter();
+        var model3DGroup = modelImporter.Load(_path);
+        var diffuseMaterial = new DiffuseMaterial(new SolidColorBrush(Colors.DarkGray));
+
+        foreach (GeometryModel3D child in model3DGroup.Children.Cast<GeometryModel3D>())
+        {
+            child.Material = diffuseMaterial;
+            child.BackMaterial = diffuseMaterial;
+        }
+
+        modelVisual.Content = model3DGroup;
+    }
+}