Cube with texture not visible

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  I want to texture a cube with an image. My problem is, that the cube is invisible in case I use the ImageBrush. When using a SolidColorBrush everything is fine. I need to do this programmatically because in the main project all objects and materials are created on runtime. I don't know where my fault is. May someone help me to figure it out?

  possible texture: https://en.wikipedia.org/wiki/Portable_Network_Graphics#/media/File:PNG_transparency_demonstration_1.png

  MainWindow.xaml

  <Window x:Class="WpfApp1.MainWindow"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
          xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
          xmlns:local="clr-namespace:WpfApp1"
          mc:Ignorable="d"
          Title="MainWindow" Height="450" Width="800">
      <Grid>
          <Label 
                  HorizontalAlignment="Center" 
                  TextBlock.TextAlignment="Center" 
                  FontSize="20" 
                  Foreground="Red" 
                  Content="Model: Cube"/>
          <Viewport3D x:Name="MainViewport">
              <Viewport3D.Camera>
                  <PerspectiveCamera 
                          FarPlaneDistance="20" 
                          LookDirection="0,0,1" 
                          UpDirection="0,1,0" 
                          NearPlaneDistance="1" 
                          Position="0,0,-3" 
                          FieldOfView="45" />
              </Viewport3D.Camera>
          </Viewport3D>
      </Grid>
  </Window>
  

  
  

  MainWindow.xaml.cs

  using System;
  using System.Windows;
  using System.Windows.Media;
  using System.Windows.Media.Imaging;
  using System.Windows.Media.Media3D;
  
  namespace WpfApp1
  {
      /// <summary>
      /// Interaktionslogik für MainWindow.xaml
      /// </summary>
      public partial class MainWindow : Window
      {
          public MainWindow()
          {
              InitializeComponent();
  
              //setup the 3D Object
              ModelVisual3D model = new ModelVisual3D();
              Model3DGroup mdlGroup = new Model3DGroup();
  
              //Jpg Texture as main purpose
              BitmapImage imgSource = new BitmapImage();
              string texturePath = @"./Texture2.PNG";
              imgSource.BeginInit();
              imgSource.UriSource = new Uri(texturePath, UriKind.Relative);
              imgSource.EndInit();
              ImageBrush imgBrush = new ImageBrush(imgSource);
  
              //Solid Black as alternative for testing
              SolidColorBrush colorBrush = new SolidColorBrush(Color.FromRgb(0,0,0));
  
              //Create Material
              DiffuseMaterial material = new DiffuseMaterial(colorBrush);
  
              //Generating the model
              GeometryModel3D internalModel = new GeometryModel3D(new MeshGeometry3D(), material)
              {
                  BackMaterial = material
              };
  
              //Generating the mesh of the model
              MeshGeometry3D mesh = (MeshGeometry3D)internalModel.Geometry;
              mesh.Positions.Add(new Point3D(-0.5, -0.5, -0.5));
              mesh.Positions.Add(new Point3D(-0.5, 0.5, -0.5));
              mesh.Positions.Add(new Point3D(0.5, 0.5, -0.5));
              mesh.Positions.Add(new Point3D(0.5, 0.5, -0.5));
              mesh.Positions.Add(new Point3D(0.5, -0.5, -0.5));
              mesh.Positions.Add(new Point3D(-0.5, -0.5, -0.5));
              mesh.TriangleIndices.Add(0);
              mesh.TriangleIndices.Add(1);
              mesh.TriangleIndices.Add(2);
              mesh.TriangleIndices.Add(3);
              mesh.TriangleIndices.Add(4);
              mesh.TriangleIndices.Add(5);
              mesh.Normals.Add(new Vector3D(0, 0, -1));
              mesh.Normals.Add(new Vector3D(0, 0, -1));
              mesh.Normals.Add(new Vector3D(0, 0, -1));
              mesh.Normals.Add(new Vector3D(0, 0, -1));
              mesh.Normals.Add(new Vector3D(0, 0, -1));
              mesh.Normals.Add(new Vector3D(0, 0, -1));
              mesh.Freeze();
  
              //including everything
              mdlGroup.Children.Add(internalModel);
              DirectionalLight myDirLight = new DirectionalLight
              {
                  Color = Colors.White,
                  Direction = new Vector3D(-3, -4, -5)
              };
              mdlGroup.Children.Add(myDirLight);
              model.Content = mdlGroup;
              this.MainViewport.Children.Add(model);
          }
      }
  }
  

  
  

  • Moved by Jack J JunMicrosoft contingent staff Thursday, October 15, 2020 8:09 AM

  Thursday, October 15, 2020 5:54 AM