About WPF PointLinght

Question

I created a 3D view with a TextBlock in it and a SpotLight in it. I wanted it to look like a flashlight, but no matter how I tried to debug it, it didn't work.So I hope some teachers can teach me.Thank you very much。

code：
<Viewport3D>
<Viewport3D.Camera>
<PerspectiveCamera x:Name="camera" LookDirection="0,0,-1" Position="0.5,0.5,1" />
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<SpotLight x:Name="light" ConstantAttenuation="0.001" Direction="0,0,-1" LinearAttenuation="0.001" Position="0.5,0.5,0.2"
QuadraticAttenuation="0.001" Range="0.5" Color="Red" />
</ModelVisual3D.Content>
</ModelVisual3D>
<Viewport2DVisual3D>
<Viewport2DVisual3D.Material>
<DiffuseMaterial Brush="White" Viewport2DVisual3D.IsVisualHostMaterial="True" />
</Viewport2DVisual3D.Material>
<Viewport2DVisual3D.Geometry>
<MeshGeometry3D Positions="0,0,0 1,0,0 1,1,0 0,1,0" TextureCoordinates="0,1 1,1 1,0 0,0" TriangleIndices="0,1,2 2,3,0" />
</Viewport2DVisual3D.Geometry>
<Border Background="White">
<Grid Margin="100">
<TextBlock Text="你好" Foreground="Black" />
</Grid>
</Border>
</Viewport2DVisual3D>
</Viewport3D>

Answer 1

I do some updates for your code as below shown:

  <Viewbox>  
                <Canvas Width="321" Height="201">  
                    <Viewport3D ClipToBounds="True" Width="150" Height="150" Canvas.Left="0" Canvas.Top="10">  
                <Viewport3D.Camera>  
                    <PerspectiveCamera Position="0,0,2" LookDirection="0,0,-1" FieldOfView="60" />  
                </Viewport3D.Camera>  
  
                <Viewport3D.Children>  
                    <ModelVisual3D>  
                        <ModelVisual3D.Content>  
                            <SpotLight x:Name="mySpotLight" InnerConeAngle="20" OuterConeAngle="20" Color="White" Direction="0,0,-1"  Position="1,1,6" Range="20"/>  
                        </ModelVisual3D.Content>  
                    </ModelVisual3D>  
                            <Viewport2DVisual3D>  
                                <Viewport2DVisual3D.Material>  
                                    <DiffuseMaterial Brush="White" Viewport2DVisual3D.IsVisualHostMaterial="True" />  
                                </Viewport2DVisual3D.Material>  
                                <Viewport2DVisual3D.Geometry>  
                                    <MeshGeometry3D Positions="0,0,0 1,0,0 1,1,0 0,1,0" TextureCoordinates="0,1 1,1 1,0 0,0" TriangleIndices="0,1,2 2,3,0" />  
                                </Viewport2DVisual3D.Geometry>  
                                <Border Background="White">  
                                    <Grid Margin="100">  
                                        <TextBlock Text="你好" Foreground="Black" />  
                                    </Grid>  
                                </Border>  
                            </Viewport2DVisual3D>  
                        </Viewport3D.Children>  
                 
            </Viewport3D>  
                </Canvas>  
            </Viewbox>  

And the result picture is:

Is this what you want? If it is not, please show me more details about your question or post an effect picture.

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