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    Visual Basic / WPF / 3D

    I'm trying to place a texture in a 3d object, using Visual Basic and WPF, but I'm not being able to do it.
    If instead of an image I render a blue square, by replacing the line
    mymodel3dgroup.Children.Add(New GeometryModel3D(mymesh, df))
    mymodel3dgroup.Children.Add(New GeometryModel3D(mymesh, New DiffuseMaterial(Brushes.Blue)))
    then I get a blue square. But what I need is to see the image, not just paint the object(s).
    Can you please help?
    My thanks in advanced

    Imports System.Windows.Media.Media3D

    Public Class UserControl1
    Dim mymesh As New MeshGeometry3D
    Dim myviewport3d As New Viewport3D
    Dim mymodelvisual As New ModelVisual3D
    Dim mypccamera As New PerspectiveCamera(New Point3D(0, 0, -5), New Vector3D(0, 0, 1), New Vector3D(0, 1, 0), 100)
    Dim mymodel3dgroup As New Model3DGroup
    Dim myMaterial As DiffuseMaterial

    Private Sub UserControl1_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded

    contentcontrol1.Content = myviewport3d


    myviewport3d.Camera = mypccamera

    mymodel3dgroup.Children.Add(New DirectionalLight(Colors.White, New Vector3D(0, 0, 1)))

    mymodelvisual.Content = mymodel3dgroup

    mymesh.Positions.Add(New Point3D(0, 7, 0))
    mymesh.Positions.Add(New Point3D(7, 7, 0))
    mymesh.Positions.Add(New Point3D(7, 0, 0))
    mymesh.Positions.Add(New Point3D(7, 0, 0))
    mymesh.Positions.Add(New Point3D(0, 0, 0))
    mymesh.Positions.Add(New Point3D(0, 7, 0))

    Dim m As System.Windows.Media.Media3D.Material
    'Dim m = New System.Windows.Media.Media3D.Material()
    Dim df As System.Windows.Media.Media3D.DiffuseMaterial
    Dim spm As System.Windows.Media.Media3D.SpecularMaterial

    Dim ri As Uri = New Uri("d:\transferir.jpeg", UriKind.Absolute)
    Dim imgSource As ImageSource = New BitmapImage(ri)

    Dim ib = New ImageBrush()
    ib.ImageSource = New BitmapImage(New Uri("d:\cc.png", UriKind.Absolute))
    ib.Stretch = Stretch.Fill
    ib.ViewboxUnits = BrushMappingMode.Absolute
    ib.AlignmentX = AlignmentX.Left
    ib.AlignmentY = AlignmentY.Top

    ib.Opacity = 0.5

    df = New System.Windows.Media.Media3D.DiffuseMaterial(ib)

    spm = New System.Windows.Media.Media3D.SpecularMaterial(ib, 85)

    mymodel3dgroup.Children.Add(New GeometryModel3D(mymesh, df))

    End Sub

    End Class
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    thank you friends .I got the information from this page.
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    I have applied your code in design 3d object and it has really helped me. That's really helped.

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