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Код

<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Grid>  
         <Viewport3D RenderTransformOrigin="0.5,0.5" >
            <Viewport3D.Camera>
                    <PerspectiveCamera x:Name="camera" Position="0.5 0.5 5" LookDirection="0 0 -5" />
            </Viewport3D.Camera>
            <ModelVisual3D>
                <ModelVisual3D.Content>
                        <DirectionalLight x:Name="dirLightMain" Direction="-1 -1 -1" />
                </ModelVisual3D.Content>
            </ModelVisual3D>
            <ModelVisual3D>
                <ModelVisual3D.Content>
                    <GeometryModel3D>
                        <GeometryModel3D.Geometry>
                                <MeshGeometry3D x:Name="meshMain"  
                                    Positions="0 0 0  1 0 0  0 1 0  1 1 0  0 0 1  1 0 1  0 1 1  1 1 1"  
                                    TriangleIndices="2 3 1  2 1 0  7 1 3  7 5 1  6 5 7  6 4 5  6 2 4  2 0 4  2 7 3  2 6 7  0 1 5  0 5 4" />
                        </GeometryModel3D.Geometry>
                        <GeometryModel3D.Material>
                            <DiffuseMaterial x:Name="matDiffuseMain">
                                <DiffuseMaterial.Brush>
                                    <SolidColorBrush Color="Yellow" />
                                </DiffuseMaterial.Brush>
                            </DiffuseMaterial>
                        </GeometryModel3D.Material>
                            <GeometryModel3D.Transform>
                                <Transform3DGroup>
                                    <RotateTransform3D x:Name="xRotation" CenterX="0.5" CenterY="0.5" CenterZ="0.5" >
                                        <RotateTransform3D.Rotation>
                                            <AxisAngleRotation3D Axis="1,0,0" Angle="30" />
                                        </RotateTransform3D.Rotation>
                                    </RotateTransform3D>
                                    <RotateTransform3D x:Name="yRotation" CenterX="0.5" CenterY="0.5" CenterZ="0.5" >
                                        <RotateTransform3D.Rotation>
                                            <AxisAngleRotation3D Axis="0,1,0" Angle="45" />
                                        </RotateTransform3D.Rotation>
                                    </RotateTransform3D>
                                </Transform3DGroup>
                            </GeometryModel3D.Transform>
                        </GeometryModel3D>
                </ModelVisual3D.Content>
            </ModelVisual3D>
        </Viewport3D> 
  </Grid>
</Page>