c# - 如何在代码中动态计算 WPF 所有相机设置？

Question

我在窗口中有 Viewport3D。当窗口大小改变时，它会改变大小。

<Window>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="100"/>
      <RowDefinition/>
    <Grid.RowDefinitions>
    <Label Grid.Row="0" Content="top label"/>
    <Viewport3D Grid.Row="1" x:Name="vp3D" >
            <Viewport3D.Camera >
                 <PerspectiveCamera x:Name="pCamera"  LookDirection="0 0 -1" UpDirection="0 1 0" />
            </Viewport3D.Camera>
            <Viewport2DVisual3D x:Name="v2dv3d">
                  <Viewport2DVisual3D.Geometry>
                      <MeshGeometry3D x:Name="mg3d" TextureCoordinates="0,0 0,1 1,1 1,0" TriangleIndices="0 1 2 0 2 3"/>
                   </Viewport2DVisual3D.Geometry>
                   <Viewport2DVisual3D.Material>
                         <DiffuseMaterial Viewport2DVisual3D.IsVisualHostMaterial="True" Brush="White"/>
                   </Viewport2DVisual3D.Material>

                          <Image  Height="{Binding ElementName=vp3D, Path=ActualHeight}" Width="{Binding ElementName=vp3D, Path=ActualWidth}" Stretch="Fill"/>

            </Viewport2DVisual3D>
            <ModelVisual3D>
                 <ModelVisual3D.Content>
                      <DirectionalLight Color="#FFFFFFFF" Direction="0,0,-1"/>
                 </ModelVisual3D.Content>
           </ModelVisual3D>
  </Viewport3D>
 </Grid>
</Window

现在 我希望图像像原始 2d 窗口一样显示(看起来没有任何变化，但实际上图像是 3d)。

但问题是如果我希望它看起来与 WPF 原始外观相同，我必须更改一些相机设置，例如 PerspectiveCamera.Position 或 MeshGeometry3D.Position .因为 Viewport3D 会在窗口改变大小时动态改变大小，我必须动态计算 Viewport3D 设置。有什么办法吗？

我已经试过了，但无法正确计算: WPF 3D: Fitting entire image to view with PerspectiveCamera

Answer 1

我不确定这是否是您想要的，但您尝试过吗？

<Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="100"/>
      <RowDefinition/>
    </Grid.RowDefinitions>
    <Label Grid.Row="0" Content="top label"/>
    <Image HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="1" Stretch="Fill"/>
    <Viewport3D Grid.Row="1" x:Name="vp3D">
            <Viewport3D.Camera >
                 <PerspectiveCamera x:Name="pCamera" Position="0,0,1" LookDirection="0,0,-1" />
            </Viewport3D.Camera>
            <Viewport2DVisual3D x:Name="v2dv3d">
                  <Viewport2DVisual3D.Geometry>
                      <MeshGeometry3D x:Name="mg3d" Positions="-1,1,0 -1,-1,0 1,-1,0 1,1,0" TextureCoordinates="0,0 0,1 1,1 1,0" TriangleIndices="0 1 2 0 2 3"/>
                   </Viewport2DVisual3D.Geometry>
                   <Viewport2DVisual3D.Material>
                         <DiffuseMaterial Viewport2DVisual3D.IsVisualHostMaterial="True" Brush="White"/>
                   </Viewport2DVisual3D.Material>
            </Viewport2DVisual3D>
            <ModelVisual3D>
                 <ModelVisual3D.Content>
                      <DirectionalLight Color="#FFFFFFFF" Direction="0,0,-1"/>
                 </ModelVisual3D.Content>
           </ModelVisual3D>
      </Viewport3D>
</Grid>