diff --git a/FModel/ViewModels/ModelViewerViewModel.cs b/FModel/ViewModels/ModelViewerViewModel.cs
index b329a54e..151ed23e 100644
--- a/FModel/ViewModels/ModelViewerViewModel.cs
+++ b/FModel/ViewModels/ModelViewerViewModel.cs
@@ -11,10 +11,9 @@ using CUE4Parse_Conversion.Meshes.PSK;
 using CUE4Parse_Conversion.Textures;
 using FModel.Framework;
 using HelixToolkit.SharpDX.Core;
-using HelixToolkit.SharpDX.Core.Model;
 using HelixToolkit.Wpf.SharpDX;
 using SharpDX;
-using SharpDX.DXGI;
+using SharpDX.Direct3D11;
 using Camera = HelixToolkit.Wpf.SharpDX.Camera;
 using Geometry3D = HelixToolkit.SharpDX.Core.Geometry3D;
 using PerspectiveCamera = HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
@@ -58,11 +57,33 @@ namespace FModel.ViewModels
             set => SetProperty(ref _zAxis, value);
         }
 
+        private FillMode _fillMode
+        {
+            get => _showWireframe ? FillMode.Wireframe : FillMode.Solid;
+        }
+
         private bool _showWireframe;
         public bool ShowWireframe
         {
             get => _showWireframe;
-            set => SetProperty(ref _showWireframe, value);
+            set
+            {
+                SetProperty(ref _showWireframe, value);
+                foreach (var g in Group3d)
+                {
+                    if (g is not MeshGeometryModel3D geometryModel)
+                        continue;
+
+                    geometryModel.FillMode = _fillMode;
+                }
+            }
+        }
+
+        private bool _appendModeEnabled;
+        public bool AppendModeEnabled
+        {
+            get => _appendModeEnabled;
+            set => SetProperty(ref _appendModeEnabled, value);
         }
 
         private ObservableElement3DCollection _group3d;
@@ -72,7 +93,7 @@ namespace FModel.ViewModels
             set => SetProperty(ref _group3d, value);
         }
 
-        private readonly int[] _FACES_INDEX = { 1, 0, 2 };
+        private readonly int[] _facesIndex = { 1, 0, 2 };
 
         public ModelViewerViewModel()
         {
@@ -83,7 +104,7 @@ namespace FModel.ViewModels
 
         public void LoadExport(UObject export)
         {
-            Clear();
+            if (!AppendModeEnabled) Clear();
             switch (export)
             {
                 case UStaticMesh st:
@@ -97,6 +118,17 @@ namespace FModel.ViewModels
             }
         }
 
+        public void HideToggleAll()
+        {
+            foreach (var g in Group3d)
+            {
+                if (g is not MeshGeometryModel3D geometryModel)
+                    continue;
+
+                geometryModel.IsRendering = !geometryModel.IsRendering;
+            }
+        }
+
         private void LoadStaticMesh(UStaticMesh mesh)
         {
             if (!mesh.TryConvert(out var convertedMesh) || convertedMesh.LODs.Count <= 0)
@@ -139,7 +171,7 @@ namespace FModel.ViewModels
                 // NumFaces * 3 (triangle) = next section FirstIndex
                 for (var j = 0; j < section.NumFaces; j++) // draw a triangle for each face
                 {
-                    foreach (var t in _FACES_INDEX) // triangle face 1 then 0 then 2
+                    foreach (var t in _facesIndex) // triangle face 1 then 0 then 2
                     {
                         var id = section.FirstIndex + j * 3 + t;
                         var vert = verts[indices[id]];
@@ -182,7 +214,8 @@ namespace FModel.ViewModels
                     Name = unrealMaterial.Name,
                     Geometry = builder.ToMeshGeometry3D(),
                     Material = m,
-                    IsRendering = isRendering
+                    IsRendering = isRendering,
+                    FillMode = _fillMode
                 });
             }
         }
diff --git a/FModel/Views/ModelViewer.xaml b/FModel/Views/ModelViewer.xaml
index d1c1c1e1..bbf9dc73 100644
--- a/FModel/Views/ModelViewer.xaml
+++ b/FModel/Views/ModelViewer.xaml
@@ -4,6 +4,7 @@
                              xmlns:converters="clr-namespace:FModel.Views.Resources.Converters"
                              xmlns:adonisUi="clr-namespace:AdonisUI;assembly=AdonisUI"
                              xmlns:adonisControls="clr-namespace:AdonisUI.Controls;assembly=AdonisUI"
+                             xmlns:adonisExtensions="clr-namespace:AdonisUI.Extensions;assembly=AdonisUI"
                              xmlns:helix="http://helix-toolkit.org/wpf/SharpDX"
                              WindowStartupLocation="CenterScreen" ResizeMode="CanResize" IconVisibility="Collapsed" Background="#262630"
                              PreviewKeyDown="OnWindowKeyDown" Closing="OnClosing"
@@ -22,42 +23,43 @@
         </ResourceDictionary>
     </adonisControls:AdonisWindow.Resources>
     <Grid>
-        <Grid.RowDefinitions>
-            <RowDefinition Height="Auto" />
-            <RowDefinition Height="{adonisUi:Space 1}" />
-            <RowDefinition Height="*"/>
-        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto" MinWidth="250" />
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="4*" />
+        </Grid.ColumnDefinitions>
 
-        <Menu Grid.Row="0">
-            <MenuItem Header="Append" />
-        </Menu>
+        <Grid Grid.Column="0" Background="#2A2B34">
+            <Grid.RowDefinitions>
+                <RowDefinition Height="*" />
+                <RowDefinition Height="Auto" />
+            </Grid.RowDefinitions>
 
-        <Grid Grid.Row="2">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="*" />
-                <ColumnDefinition Width="3*" />
-            </Grid.ColumnDefinitions>
-
-            <ListBox Grid.Column="0" Style="{StaticResource MaterialsListBox}" />
-            <helix:Viewport3DX Grid.Column="1" EffectsManager="{Binding ModelViewer.EffectManager}" Camera="{Binding ModelViewer.Cam}"
-                               IsChangeFieldOfViewEnabled="False" IsMoveEnabled="False" UseDefaultGestures="False" ShowViewCube="False"
-                               ShowCameraTarget="False" ModelUpDirection="0,0,1" EnableSSAO="True" MSAA="Maximum" FXAALevel="Ultra"
-                               SSAOQuality="High" BackgroundColor="#262630">
-                <helix:Viewport3DX.InputBindings>
-                    <MouseBinding Command="helix:ViewportCommands.Rotate" Gesture="LeftClick" />
-                    <MouseBinding Command="helix:ViewportCommands.Zoom" Gesture="RightClick" />
-                    <MouseBinding Command="helix:ViewportCommands.Pan" Gesture="MiddleClick" />
-                </helix:Viewport3DX.InputBindings>
-
-                <helix:AmbientLight3D Color="DimGray" />
-                <helix:DirectionalLight3D Direction="{Binding ModelViewer.Cam.LookDirection}" Color="White" />
-
-                <helix:LineGeometryModel3D Geometry="{Binding ModelViewer.XAxis}" Color="#FC3854" />
-                <helix:LineGeometryModel3D Geometry="{Binding ModelViewer.YAxis}" Color="#85CB22" />
-                <helix:LineGeometryModel3D Geometry="{Binding ModelViewer.ZAxis}" Color="#388EED" />
-
-                <helix:GroupModel3D x:Name="MyAntiCrashGroup" ItemsSource="{Binding ModelViewer.Group3d}" />
-            </helix:Viewport3DX>
+            <ListBox Grid.Row="0" Style="{StaticResource MaterialsListBox}" />
+            <CheckBox Content="Append Mode" VerticalAlignment="Stretch" HorizontalAlignment="Center" Margin="0 0 0 5"
+                      Grid.Row="1" IsChecked="{Binding ModelViewer.AppendModeEnabled}" Style="{DynamicResource {x:Static adonisUi:Styles.ToggleSwitch}}" />
         </Grid>
+
+        <GridSplitter Grid.Column="1" ResizeDirection="Columns" Width="4" VerticalAlignment="Stretch" ResizeBehavior="PreviousAndNext"
+                      Background="{DynamicResource {x:Static adonisUi:Brushes.Layer0BackgroundBrush}}" />
+
+        <helix:Viewport3DX Grid.Column="2" EffectsManager="{Binding ModelViewer.EffectManager}" Camera="{Binding ModelViewer.Cam}"
+                           IsChangeFieldOfViewEnabled="False" IsMoveEnabled="False" UseDefaultGestures="False" ShowViewCube="False"
+                           ShowCameraTarget="False" ModelUpDirection="0,0,1" BackgroundColor="#2A2B34">
+            <helix:Viewport3DX.InputBindings>
+                <MouseBinding Command="helix:ViewportCommands.Rotate" Gesture="LeftClick" />
+                <MouseBinding Command="helix:ViewportCommands.Zoom" Gesture="RightClick" />
+                <MouseBinding Command="helix:ViewportCommands.Pan" Gesture="MiddleClick" />
+            </helix:Viewport3DX.InputBindings>
+
+            <helix:AmbientLight3D Color="DimGray" />
+            <helix:DirectionalLight3D Direction="{Binding ModelViewer.Cam.LookDirection}" Color="White" />
+
+            <helix:LineGeometryModel3D Geometry="{Binding ModelViewer.XAxis}" Color="#FC3854" />
+            <helix:LineGeometryModel3D Geometry="{Binding ModelViewer.YAxis}" Color="#85CB22" />
+            <helix:LineGeometryModel3D Geometry="{Binding ModelViewer.ZAxis}" Color="#388EED" />
+
+            <helix:GroupModel3D x:Name="MyAntiCrashGroup" ItemsSource="{Binding ModelViewer.Group3d}" />
+        </helix:Viewport3DX>
     </Grid>
 </adonisControls:AdonisWindow>
diff --git a/FModel/Views/ModelViewer.xaml.cs b/FModel/Views/ModelViewer.xaml.cs
index 4734917c..ba636e24 100644
--- a/FModel/Views/ModelViewer.xaml.cs
+++ b/FModel/Views/ModelViewer.xaml.cs
@@ -2,7 +2,6 @@
 using System.Windows.Input;
 using CUE4Parse.UE4.Assets.Exports;
 using FModel.Services;
-using FModel.Settings;
 using FModel.ViewModels;
 
 namespace FModel.Views
@@ -22,12 +21,15 @@ namespace FModel.Views
 
         private void OnWindowKeyDown(object sender, KeyEventArgs e)
         {
-            /*if (UserSettings.Default.DirLeftTab.IsTriggered(e.Key))
-                _applicationView.ModelViewer.PreviousLod();
-            else if (UserSettings.Default.DirRightTab.IsTriggered(e.Key))
-                _applicationView.ModelViewer.NextLod();
-            else */if (e.Key == Key.W)
-                _applicationView.ModelViewer.ShowWireframe = !_applicationView.ModelViewer.ShowWireframe;
+            switch (e.Key)
+            {
+                case Key.W:
+                    _applicationView.ModelViewer.ShowWireframe = !_applicationView.ModelViewer.ShowWireframe;
+                    break;
+                case Key.H:
+                    _applicationView.ModelViewer.HideToggleAll();
+                    break;
+            }
         }
     }
 }
diff --git a/FModel/Views/Resources/Converters/BoolToFillModeConverter.cs b/FModel/Views/Resources/Converters/BoolToFillModeConverter.cs
new file mode 100644
index 00000000..6b133140
--- /dev/null
+++ b/FModel/Views/Resources/Converters/BoolToFillModeConverter.cs
@@ -0,0 +1,30 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using SharpDX.Direct3D11;
+
+namespace FModel.Views.Resources.Converters
+{
+    public class BoolToFillModeConverter : IValueConverter
+    {
+        public static readonly BoolToFillModeConverter Instance = new();
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value switch
+            {
+                FillMode.Solid => true,
+                _ => false
+            };
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value switch
+            {
+                true => FillMode.Solid,
+                _ => FillMode.Wireframe
+            };
+        }
+    }
+}
diff --git a/FModel/Views/Resources/Resources.xaml b/FModel/Views/Resources/Resources.xaml
index 903d509c..5065dc80 100644
--- a/FModel/Views/Resources/Resources.xaml
+++ b/FModel/Views/Resources/Resources.xaml
@@ -4,6 +4,7 @@
                     xmlns:system="clr-namespace:System;assembly=mscorlib"
                     xmlns:controls="clr-namespace:FModel.Views.Resources.Controls"
                     xmlns:soundOut="clr-namespace:CSCore.SoundOut;assembly=CSCore"
+                    xmlns:sharpDx="clr-namespace:SharpDX.Direct3D11;assembly=SharpDX.Direct3D11"
                     xmlns:audioControls="clr-namespace:FModel.Views.Resources.Controls.Aup"
                     xmlns:converters="clr-namespace:FModel.Views.Resources.Converters"
                     xmlns:avalonedit="http://icsharpcode.net/sharpdevelop/avalonedit"
@@ -67,6 +68,8 @@
     <Geometry x:Key="MaterialIcon">M11 9h2v2h-2V9zm-2 2h2v2H9v-2zm4 0h2v2h-2v-2zm2-2h2v2h-2V9zM7 9h2v2H7V9zm12-6H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2V5c0-1.1-.9-2-2-2zM9 18H7v-2h2v2zm4 0h-2v-2h2v2zm4 0h-2v-2h2v2zm2-7h-2v2h2v2h-2v-2h-2v2h-2v-2h-2v2H9v-2H7v2H5v-2h2v-2H5V6c0-.55.45-1 1-1h12c.55 0 1 .45 1 1v5z</Geometry>
     <Geometry x:Key="VisibleIcon">M12 4C7 4 2.73 7.11 1 11.5 2.73 15.89 7 19 12 19s9.27-3.11 11-7.5C21.27 7.11 17 4 12 4zm0 12.5c-2.76 0-5-2.24-5-5s2.24-5 5-5 5 2.24 5 5-2.24 5-5 5zm0-8c-1.66 0-3 1.34-3 3s1.34 3 3 3 3-1.34 3-3-1.34-3-3-3z</Geometry>
     <Geometry x:Key="NotVisibleIcon">M12 6.5c2.76 0 5 2.24 5 5 0 .51-.1 1-.24 1.46l3.06 3.06c1.39-1.23 2.49-2.77 3.18-4.53C21.27 7.11 17 4 12 4c-1.27 0-2.49.2-3.64.57l2.17 2.17c.47-.14.96-.24 1.47-.24zM2.71 3.16c-.39.39-.39 1.02 0 1.41l1.97 1.97C3.06 7.83 1.77 9.53 1 11.5 2.73 15.89 7 19 12 19c1.52 0 2.97-.3 4.31-.82l2.72 2.72c.39.39 1.02.39 1.41 0 .39-.39.39-1.02 0-1.41L4.13 3.16c-.39-.39-1.03-.39-1.42 0zM12 16.5c-2.76 0-5-2.24-5-5 0-.77.18-1.5.49-2.14l1.57 1.57c-.03.18-.06.37-.06.57 0 1.66 1.34 3 3 3 .2 0 .38-.03.57-.07L14.14 16c-.65.32-1.37.5-2.14.5zm2.97-5.33c-.15-1.4-1.25-2.49-2.64-2.64l2.64 2.64z</Geometry>
+    <Geometry x:Key="WireframeIcon">M3 5h2V3c-1.1 0-2 .9-2 2zm0 8h2v-2H3v2zm4 8h2v-2H7v2zM3 9h2V7H3v2zm10-6h-2v2h2V3zm6 0v2h2c0-1.1-.9-2-2-2zM5 21v-2H3c0 1.1.9 2 2 2zm-2-4h2v-2H3v2zM9 3H7v2h2V3zm2 18h2v-2h-2v2zm8-8h2v-2h-2v2zm0 8c1.1 0 2-.9 2-2h-2v2zm0-12h2V7h-2v2zm0 8h2v-2h-2v2zm-4 4h2v-2h-2v2zm0-16h2V3h-2v2zM8 17h8c.55 0 1-.45 1-1V8c0-.55-.45-1-1-1H8c-.55 0-1 .45-1 1v8c0 .55.45 1 1 1zm1-8h6v6H9V9z</Geometry>
+    <Geometry x:Key="NotWireframeIcon">M3,13h2v-2H3V13z M7,21h2v-2H7V21z M13,3h-2v2h2V3z M19,3v2h2C21,3.9,20.1,3,19,3z M5,21v-2H3C3,20.1,3.9,21,5,21z M3,17h2 v-2H3V17z M11,21h2v-2h-2V21z M19,13h2v-2h-2V13z M19,9h2V7h-2V9z M15,5h2V3h-2V5z M7.83,5L7,4.17V3h2v2H7.83z M19.83,17L19,16.17 V15h2v2H19.83z M9,15v-3.17L12.17,15H9z M2.1,3.51c-0.39,0.39-0.39,1.02,0,1.41L4.17,7H3v2h2V7.83l2,2V16c0,0.55,0.45,1,1,1h6.17 l2,2H15v2h2v-1.17l2.07,2.07c0.39,0.39,1.02,0.39,1.41,0c0.39-0.39,0.39-1.02,0-1.41L3.51,3.51C3.12,3.12,2.49,3.12,2.1,3.51z M17,8c0-0.55-0.45-1-1-1H9.83l2,2H15v3.17l2,2V8z</Geometry>
 
     <Style x:Key="TabItemFillSpace" TargetType="TabItem" BasedOn="{StaticResource {x:Type TabItem}}">
         <Setter Property="Width">
@@ -616,7 +619,7 @@
 
     <Style x:Key="MaterialsListBox" TargetType="ListBox" BasedOn="{StaticResource {x:Type ListBox}}">
         <Setter Property="ItemsSource" Value="{Binding ModelViewer.Group3d, IsAsync=True}" />
-        <Setter Property="SelectionMode" Value="Extended" />
+        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
         <Setter Property="adonisExtensions:ScrollViewerExtension.VerticalScrollBarExpansionMode" Value="NeverExpand"/>
         <Setter Property="adonisExtensions:ScrollViewerExtension.VerticalScrollBarPlacement" Value="Docked"/>
         <Setter Property="adonisExtensions:ScrollViewerExtension.HorizontalScrollBarExpansionMode" Value="NeverExpand"/>
@@ -630,6 +633,7 @@
                             <ColumnDefinition Width="*" />
                             <ColumnDefinition Width="25" />
                             <ColumnDefinition Width="Auto" />
+                            <ColumnDefinition Width="Auto" />
                         </Grid.ColumnDefinitions>
 
                         <Image Grid.Column="0" Source="/FModel;component/Resources/materialicon.png" Width="16" Height="16" Margin="5 0" HorizontalAlignment="Center" />
@@ -637,19 +641,34 @@
                         <ToggleButton Grid.Column="3" IsChecked="{Binding IsRendering}" Padding="3" Style="{DynamicResource {x:Static adonisUi:Styles.ToolbarToggleButton}}">
                             <Viewbox Width="16" Height="16" HorizontalAlignment="Center">
                                 <Canvas Width="24" Height="24">
-                                    <Path x:Name="SvgIcon" Fill="{DynamicResource {x:Static adonisUi:Brushes.ForegroundBrush}}" Data="{StaticResource VisibleIcon}" />
+                                    <Path x:Name="SvgIcon1" Fill="{DynamicResource {x:Static adonisUi:Brushes.ForegroundBrush}}" Data="{StaticResource VisibleIcon}" />
+                                </Canvas>
+                            </Viewbox>
+                        </ToggleButton>
+                        <ToggleButton Grid.Column="4" IsChecked="{Binding FillMode, Converter={x:Static converters:BoolToFillModeConverter.Instance}}" Padding="3" Style="{DynamicResource {x:Static adonisUi:Styles.ToolbarToggleButton}}">
+                            <Viewbox Width="16" Height="16" HorizontalAlignment="Center">
+                                <Canvas Width="24" Height="24">
+                                    <Path x:Name="SvgIcon2" Fill="{DynamicResource {x:Static adonisUi:Brushes.ForegroundBrush}}" Data="{StaticResource WireframeIcon}" />
                                 </Canvas>
                             </Viewbox>
                         </ToggleButton>
                     </Grid>
                     <DataTemplate.Triggers>
                         <DataTrigger Binding="{Binding IsRendering}" Value="True">
-                            <Setter TargetName="SvgIcon" Property="Data" Value="{StaticResource VisibleIcon}" />
-                            <Setter TargetName="SvgIcon" Property="Fill" Value="{DynamicResource {x:Static adonisUi:Brushes.ForegroundBrush}}" />
+                            <Setter TargetName="SvgIcon1" Property="Data" Value="{StaticResource VisibleIcon}" />
+                            <Setter TargetName="SvgIcon1" Property="Fill" Value="{DynamicResource {x:Static adonisUi:Brushes.ForegroundBrush}}" />
                         </DataTrigger>
                         <DataTrigger Binding="{Binding IsRendering}" Value="False">
-                            <Setter TargetName="SvgIcon" Property="Data" Value="{StaticResource NotVisibleIcon}" />
-                            <Setter TargetName="SvgIcon" Property="Fill" Value="{DynamicResource {x:Static adonisUi:Brushes.ErrorBrush}}" />
+                            <Setter TargetName="SvgIcon1" Property="Data" Value="{StaticResource NotVisibleIcon}" />
+                            <Setter TargetName="SvgIcon1" Property="Fill" Value="{DynamicResource {x:Static adonisUi:Brushes.ErrorBrush}}" />
+                        </DataTrigger>
+                        <DataTrigger Binding="{Binding FillMode}" Value="{x:Static sharpDx:FillMode.Solid}">
+                            <Setter TargetName="SvgIcon2" Property="Data" Value="{StaticResource WireframeIcon}" />
+                            <Setter TargetName="SvgIcon2" Property="Fill" Value="{DynamicResource {x:Static adonisUi:Brushes.ForegroundBrush}}" />
+                        </DataTrigger>
+                        <DataTrigger Binding="{Binding FillMode}" Value="{x:Static sharpDx:FillMode.Wireframe}">
+                            <Setter TargetName="SvgIcon2" Property="Data" Value="{StaticResource NotWireframeIcon}" />
+                            <Setter TargetName="SvgIcon2" Property="Fill" Value="{DynamicResource {x:Static adonisUi:Brushes.ErrorBrush}}" />
                         </DataTrigger>
                     </DataTemplate.Triggers>
                 </DataTemplate>