feat: allow importer to load obj,off,ply,stl from application resources (helix-toolkit#2030)

Author: alex-valchuk

.gitignore

@@ -204,4 +204,10 @@ FakesAssemblies/
 /Source/HelixToolkit.SharpDX.Shared/Shaders/_default.bfx
 **/.vs/**
 /Source/MigrationBackup/**
-**/*.cso
+**/*.cso
+
+!/Source/Examples/WPF/ExampleBrowser/Resources/simple3dModel.obj
+!/Source/Examples/WPF/ExampleBrowser/Resources/simple3dModel.objz
+!/Source/Examples/WPF/ExampleBrowser/Resources/simple3dModel.off
+!/Source/Examples/WPF/ExampleBrowser/Resources/simple3dModel.ply
+!/Source/Examples/WPF/ExampleBrowser/Resources/simple3dModel.stl

Source/Examples/WPF/ExampleBrowser/ExampleBrowser.csproj

@@ -196,6 +196,11 @@
     <Compile Include="Workitems\Workitem10046\MainWindow.xaml.cs">
       <DependentUpon>MainWindow.xaml</DependentUpon>
     </Compile>
+    <Resource Include="Resources\simple3dModel.objz" />
+    <Resource Include="Resources\simple3dModel.obj" />
+    <Resource Include="Resources\simple3dModel.off" />
+    <Resource Include="Resources\simple3dModel.ply" />
+    <Resource Include="Resources\simple3dModel.stl" />
     <Resource Include="Images\TriangularizationDemo_small.png" />
     <Resource Include="Images\MvvmCameraDemo_small.png" />
     <Resource Include="Images\MvvmDemo_small.png" />

Source/Examples/WPF/ExampleBrowser/Examples/ModelViewer/MainViewModel.cs

@@ -20,7 +20,7 @@ namespace ModelViewer
     [SuppressMessage("StyleCop.CSharp.DocumentationRules", "SA1600:ElementsMustBeDocumented", Justification = "Reviewed. Suppression is OK here.")]
     public class MainViewModel : Observable
     {
-        private const string OpenFileFilter = "3D model files (*.3ds;*.obj;*.lwo;*.stl;*.ply;)|*.3ds;*.obj;*.objz;*.lwo;*.stl;*.ply;";
+        private const string OpenFileFilter = "3D model files (*.3ds;*.obj;*.off;*.lwo;*.stl;*.ply;)|*.3ds;*.obj;*.objz;*.off;*.lwo;*.stl;*.ply;";
 
         private const string TitleFormatString = "3D model viewer - {0}";
 
@@ -60,6 +60,14 @@ public MainViewModel(IFileDialogService fds, HelixViewport3D viewport)
             {
                 this.Elements.Add(new VisualViewModel(c));
             }
+            
+            // defaults: just to make sure it works
+            var modelImporter = new ModelImporter();
+            //this.CurrentModel = modelImporter.Load("pack://application:,,,/ExampleBrowser;component/Resources/simple3dModel.obj");
+            //this.CurrentModel = modelImporter.Load("pack://application:,,,/ExampleBrowser;component/Resources/simple3dModel.objz");
+            //this.CurrentModel = modelImporter.Load("pack://application:,,,/ExampleBrowser;component/Resources/simple3dModel.off");
+            //this.CurrentModel = modelImporter.Load("pack://application:,,,/ExampleBrowser;component/Resources/simple3dModel.ply");
+            this.CurrentModel = modelImporter.Load("pack://application:,,,/ExampleBrowser;component/Resources/simple3dModel.stl");
         }
 
         public string CurrentModelPath