multiple material support in viewer

FModel/FModel.csproj

@@ -109,13 +109,13 @@
     <PackageReference Include="CSCore" Version="1.2.1.2" />
     <PackageReference Include="DiscordRichPresence" Version="1.0.175" />
     <PackageReference Include="EpicManifestParser" Version="1.2.69-temp" />
-    <PackageReference Include="HelixToolkit.SharpDX.Core.Wpf" Version="2.18.0" />
-    <PackageReference Include="K4os.Compression.LZ4.Streams" Version="1.2.12" />
+    <PackageReference Include="HelixToolkit.SharpDX.Core.Wpf" Version="2.20.0" />
+    <PackageReference Include="K4os.Compression.LZ4.Streams" Version="1.2.15" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
-    <PackageReference Include="NVorbis" Version="0.10.3" />
+    <PackageReference Include="NVorbis" Version="0.10.4" />
     <PackageReference Include="Oodle.NET" Version="1.0.1" />
-    <PackageReference Include="Ookii.Dialogs.Wpf" Version="3.1.0" />
-    <PackageReference Include="RestSharp" Version="106.12.0" />
+    <PackageReference Include="Ookii.Dialogs.Wpf" Version="5.0.0" />
+    <PackageReference Include="RestSharp" Version="106.13.0" />
     <PackageReference Include="Serilog" Version="2.10.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />
     <PackageReference Include="SkiaSharp.HarfBuzz" Version="2.80.3" />

FModel/ViewModels/ModelViewerViewModel.cs

@@ -1,6 +1,4 @@
 using System;
-using System.Collections.ObjectModel;
-using System.Linq;
 using CUE4Parse.UE4.Assets.Exports;
 using CUE4Parse.UE4.Assets.Exports.Material;
 using CUE4Parse.UE4.Assets.Exports.SkeletalMesh;
@@ -10,11 +8,14 @@ using CUE4Parse.UE4.Objects.Core.Math;
 using CUE4Parse_Conversion.Meshes;
 using CUE4Parse_Conversion.Meshes.PSK;
 using CUE4Parse_Conversion.Textures;
-using FModel.Extensions;
 using FModel.Framework;
 using HelixToolkit.SharpDX.Core;
 using HelixToolkit.Wpf.SharpDX;
 using SharpDX;
+using Camera = HelixToolkit.Wpf.SharpDX.Camera;
+using Geometry3D = HelixToolkit.SharpDX.Core.Geometry3D;
+using Material = HelixToolkit.Wpf.SharpDX.Material;
+using PerspectiveCamera = HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
 
 namespace FModel.ViewModels
 {
@@ -26,28 +27,28 @@ namespace FModel.ViewModels
             get => _effectManager;
             set => SetProperty(ref _effectManager, value);
         }
-        
+
         private Camera _cam;
         public Camera Cam
         {
             get => _cam;
             set => SetProperty(ref _cam, value);
         }
-        
+
         private Geometry3D _xAxis;
         public Geometry3D XAxis
         {
             get => _xAxis;
             set => SetProperty(ref _xAxis, value);
         }
-        
+
         private Geometry3D _yAxis;
         public Geometry3D YAxis
         {
             get => _yAxis;
             set => SetProperty(ref _yAxis, value);
         }
-        
+
         private Geometry3D _zAxis;
         public Geometry3D ZAxis
         {
@@ -62,43 +63,25 @@ namespace FModel.ViewModels
             set => SetProperty(ref _showWireframe, value);
         }
 
-        private Geometry3D _mesh;
-        public Geometry3D Mesh
+        private ObservableElement3DCollection _group3d;
+        public ObservableElement3DCollection Group3d
         {
-            get => _mesh;
-            set => SetProperty(ref _mesh, value);
+            get => _group3d;
+            set => SetProperty(ref _group3d, value);
         }
-        
-        private Material _meshMat;
-        public Material MeshMat
-        {
-            get => _meshMat;
-            set => SetProperty(ref _meshMat, value);
-        }
-        
-        public ObservableCollection<Geometry3D> Lods { get; }
+        public Material MainMaterial { get; } = PhongMaterials.White;
+
+        private readonly int[] _FACES_INDEX = { 1, 0, 2 };
 
         public ModelViewerViewModel()
         {
-            Lods = new ObservableCollection<Geometry3D>();
             EffectManager = new DefaultEffectsManager();
-            Cam = new PerspectiveCamera
-            {
-                NearPlaneDistance = 0.1,
-                FarPlaneDistance = 10000000,
-                FieldOfView = 80
-            };
+            Cam = new PerspectiveCamera { NearPlaneDistance = 0.1, FarPlaneDistance = 99999999, FieldOfView = 80 };
         }
 
-        public void NextLod() => Mesh = Lods.Next(Mesh);
-        public void PreviousLod() => Mesh = Lods.Previous(Mesh);
-
         public void LoadExport(UObject export)
         {
-            Lods.Clear();
-            Mesh = null;
-            MeshMat = PhongMaterials.Bisque;
-            
+            Group3d = new ObservableElement3DCollection();
             switch (export)
             {
                 case UStaticMesh st:
@@ -111,31 +94,24 @@ namespace FModel.ViewModels
                     throw new ArgumentOutOfRangeException();
             }
         }
-        
+
         private void LoadStaticMesh(UStaticMesh mesh)
         {
             if (!mesh.TryConvert(out var convertedMesh) || convertedMesh.LODs.Count <= 0)
             {
                 return;
             }
-            
+
             SetupCameraAndAxis(convertedMesh.BoundingBox.Min, convertedMesh.BoundingBox.Max);
 
-            var pushedMaterial = false;
             foreach (var lod in convertedMesh.LODs)
             {
                 if (lod.SkipLod) continue;
-                
-                PushLod(lod.Verts, lod.Indices.Value);
-                if (!pushedMaterial)
-                {
-                    PushMaterial(lod.Sections.Value);
-                    pushedMaterial = true;
-                }
+                PushLod(lod.Sections.Value, lod.Verts, lod.Indices.Value);
+                break;
             }
-            Mesh = Lods.First();
         }
-        
+
         private void LoadSkeletalMesh(USkeletalMesh mesh)
         {
             if (!mesh.TryConvert(out var convertedMesh) || convertedMesh.LODs.Count <= 0)
@@ -145,52 +121,50 @@ namespace FModel.ViewModels
 
             SetupCameraAndAxis(convertedMesh.BoundingBox.Min, convertedMesh.BoundingBox.Max);
 
-            var pushedMaterial = false;
             foreach (var lod in convertedMesh.LODs)
             {
                 if (lod.SkipLod) continue;
-                
-                PushLod(lod.Verts, lod.Indices.Value);
-                if (!pushedMaterial)
+                PushLod(lod.Sections.Value, lod.Verts, lod.Indices.Value);
+                break;
+            }
+        }
+
+        private void PushLod(CMeshSection[] sections, CMeshVertex[] verts, FRawStaticIndexBuffer indices)
+        {
+            foreach (var section in sections) // each section is a mesh part with its own material
+            {
+                var builder = new MeshBuilder();
+                // NumFaces * 3 (triangle) = next section FirstIndex
+                for (var j = 0; j < section.NumFaces; j++) // draw a triangle for each face
                 {
-                    PushMaterial(lod.Sections.Value);
-                    pushedMaterial = true;
+                    foreach (var t in _FACES_INDEX) // triangle face 1 then 0 then 2
+                    {
+                        var id = section.FirstIndex + j * 3 + t;
+                        var vert = verts[indices[id]];
+                        var p = new Vector3(vert.Position.X, -vert.Position.Y, vert.Position.Z);
+                        var n = new Vector3(vert.Normal.X, -vert.Normal.Y, vert.Normal.Z);
+                        var uv = new Vector2(vert.UV.U, vert.UV.V);
+                        builder.AddNode(p, n, uv);
+                        builder.TriangleIndices.Add(j * 3 + t); // one mesh part is "j * 3 + k" use "id" if you're building the full mesh
+                    }
                 }
-            }
-            Mesh = Lods.First();
-        }
 
-        private void PushLod(CMeshVertex[] verts, FRawStaticIndexBuffer indices)
-        {
-            var builder = new MeshBuilder {TextureCoordinates = new Vector2Collection()};
-            for (var i = 0; i < verts.Length; i++)
-            {
-                builder.AddNode(
-                    new Vector3(verts[i].Position.X, -verts[i].Position.Y, verts[i].Position.Z),
-                    new Vector3(verts[i].Normal.X, -verts[i].Normal.Y, verts[i].Normal.Z),
-                    new Vector2(verts[i].UV.U, verts[i].UV.V));
-            }
-            
-            for (var i = 0; i < indices.Length; i++)
-            {
-                builder.TriangleIndices.Add(indices[i]);
-            }
-
-            Lods.Add(builder.ToMesh());
-        }
-
-        private void PushMaterial(CMeshSection[] sections)
-        {
-            for (var j = 0; j < sections.Length; j++)
-            {
-                if (sections[j].Material == null || !sections[j].Material.TryLoad<UMaterialInterface>(out var unrealMaterial))
+                if (section.Material == null || !section.Material.TryLoad<UMaterialInterface>(out var unrealMaterial))
                     continue;
 
                 var parameters = new CMaterialParams();
                 unrealMaterial.GetParams(parameters);
-                if (parameters.Diffuse is not UTexture2D diffuse) continue;
-                MeshMat = new DiffuseMaterial {DiffuseMap = new TextureModel(diffuse.Decode()?.Encode().AsStream())};
-                break;
+                if (parameters.Diffuse is not UTexture2D diffuse)
+                    continue;
+
+                Group3d.Add(new MeshGeometryModel3D
+                {
+                    Geometry = builder.ToMeshGeometry3D(),
+                    Material = new PhongMaterial
+                    {
+                        DiffuseMap = new TextureModel(diffuse.Decode()?.Encode().AsStream())
+                    }
+                });
             }
         }
 
@@ -201,7 +175,7 @@ namespace FModel.ViewModels
             Cam.UpDirection = new System.Windows.Media.Media3D.Vector3D(0, 0, 1);
             Cam.Position = new System.Windows.Media.Media3D.Point3D(maxOfMax, maxOfMax, (minOfMin + maxOfMax) / 1.25);
             Cam.LookDirection = new System.Windows.Media.Media3D.Vector3D(-Cam.Position.X, -Cam.Position.Y, 0);
-            
+
             var lineBuilder = new LineBuilder();
             lineBuilder.AddLine(new Vector3(0, 0, 0), new Vector3(max.X, 0, 0));
             XAxis = lineBuilder.ToLineGeometry3D();
@@ -213,4 +187,4 @@ namespace FModel.ViewModels
             ZAxis = lineBuilder.ToLineGeometry3D();
         }
     }
-}
+}

FModel/Views/ModelViewer.xaml

@@ -31,17 +31,15 @@
                 <MouseBinding Command="helix:ViewportCommands.Zoom" Gesture="RightClick" />
                 <MouseBinding Command="helix:ViewportCommands.Pan" Gesture="MiddleClick" />
             </helix:Viewport3DX.InputBindings>
-            
+
             <helix:DirectionalLight3D Direction="0, 0, -1" Color="White" />
             <helix:DirectionalLight3D Direction="0, -1, 0" 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:MeshGeometryModel3D Geometry="{Binding ModelViewer.Mesh}"
-                                       Material="{Binding ModelViewer.MeshMat}"
-                                       RenderWireframe="{Binding ModelViewer.ShowWireframe}" />
+
+            <helix:GroupModel3D ItemsSource="{Binding ModelViewer.Group3d}" />
         </helix:Viewport3DX>
     </Grid>
 </adonisControls:AdonisWindow>

FModel/Views/ModelViewer.xaml.cs

@@ -9,7 +9,7 @@ namespace FModel.Views
     public partial class ModelViewer
     {
         private ApplicationViewModel _applicationView => ApplicationService.ApplicationView;
-        
+
         public ModelViewer()
         {
             DataContext = _applicationView;
@@ -17,15 +17,15 @@ namespace FModel.Views
         }
 
         public void Load(UObject export) => _applicationView.ModelViewer.LoadExport(export);
-        
+
         private void OnWindowKeyDown(object sender, KeyEventArgs e)
         {
-            if (UserSettings.Default.DirLeftTab.IsTriggered(e.Key))
+            /*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)
+            else */if (e.Key == Key.W)
                 _applicationView.ModelViewer.ShowWireframe = !_applicationView.ModelViewer.ShowWireframe;
         }
     }
-}
+}