wpf - 如何围绕 3D 轴 (Y) 旋转 2D UIElement？

Question

我有一个包含一些内容(图像、文本)的Grid，我想在 3D 空间中围绕 y 轴旋转它 - 以某种方式实现动画倾斜效果。

有没有像Rotate3DTransform这样直接适用于Grid的简单方法？

Answer 1

使用 Viewport3D

如果您愿意使用 3D 模型和旋转，那么这是我尝试为您制作的示例，我试图重现预期结果，可能不准确

    <Viewport3D>
        <Viewport3D.Resources>
            <Style TargetType="Image">
                <Setter Property="Width"
                        Value="20" />
                <Setter Property="Margin"
                        Value="4" />
                <Setter Property="Source"
                        Value="desert.jpg" />
                <Setter Property="Effect">
                    <Setter.Value>
                        <DropShadowEffect BlurRadius="4"
                                          Direction="0"
                                          ShadowDepth="0" />
                    </Setter.Value>
                </Setter>
            </Style>
        </Viewport3D.Resources>
        <Viewport3D.Camera>
            <PerspectiveCamera Position="0, 0, 4" />
        </Viewport3D.Camera>
        <Viewport2DVisual3D>
            <Viewport2DVisual3D.Transform>
                <RotateTransform3D>
                    <RotateTransform3D.Rotation>
                        <QuaternionRotation3D x:Name="rotate"
                                              Quaternion="0, 0, 0, 0.5" />
                    </RotateTransform3D.Rotation>
                </RotateTransform3D>
            </Viewport2DVisual3D.Transform>
            <Viewport2DVisual3D.Geometry>
                <MeshGeometry3D 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" />
            </Viewport2DVisual3D.Material>
            <UniformGrid Columns="3"> <!--host your content here-->
                <Image />
                <Image />
                <Image />
                <Image />
                <Image />
                <Image />
                <Image />
                <Image />
                <Image />
            </UniformGrid>
        </Viewport2DVisual3D>
        <ModelVisual3D>
            <ModelVisual3D.Content>
                <DirectionalLight Color="#FFFFFFFF"
                                  Direction="0,0,-1" />
            </ModelVisual3D.Content>
        </ModelVisual3D>
        <Viewport3D.Triggers>
            <EventTrigger RoutedEvent="Viewport3D.Loaded">
                <BeginStoryboard>
                    <Storyboard>
                        <QuaternionAnimation Storyboard.TargetName="rotate"
                                             Storyboard.TargetProperty="Quaternion"
                                             To="-0.25, 0.25, 0.15, 0.65"
                                             Duration="0:0:10"
                                             RepeatBehavior="Forever">
                            <QuaternionAnimation.EasingFunction>
                                <ElasticEase />
                            </QuaternionAnimation.EasingFunction>
                        </QuaternionAnimation>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </Viewport3D.Triggers>
    </Viewport3D>

现在您可以旋转您的模型，它是 UI 主机，当前托管带有图像 block 的网格。

您还可以将其转换为 ContentControl 的样式和模板，并附加用于旋转的属性，并在您需要的地方重复使用它。

使用二维变换

使用普通变换实现 3D 变换为网格的示例

关键是将 3D 转换为 2D 并直接应用于网格，而无需复杂的 3D 内容(此示例没有任何转换)它只是演示了一个 3D 外观的网格转换供您引用。

    <Grid Width="100" Height="100" >
        <Grid.Background>
            <ImageBrush Opacity=".5" ImageSource="Desert.jpg"/>
        </Grid.Background>
        <Button Content="Some Text" HorizontalAlignment="Center" VerticalAlignment="Center"/>
        <Grid.RenderTransform>
            <SkewTransform x:Name="skew" CenterX="50" CenterY="50"/>
        </Grid.RenderTransform>
        <Grid.Triggers>
            <EventTrigger RoutedEvent="Loaded">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Storyboard.TargetName="skew" Duration="0:0:25" Storyboard.TargetProperty="AngleX" From="0" To="60" RepeatBehavior="Forever">
                            <DoubleAnimation.EasingFunction>
                                <ElasticEase/>
                            </DoubleAnimation.EasingFunction>
                        </DoubleAnimation>
                        <DoubleAnimation Storyboard.TargetName="skew" Duration="0:0:20" Storyboard.TargetProperty="AngleY" From="0" To="50" RepeatBehavior="Forever">
                            <DoubleAnimation.EasingFunction>
                                <ElasticEase/>
                            </DoubleAnimation.EasingFunction>
                        </DoubleAnimation>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
        </Grid.Triggers>
    </Grid>