ＷＰＦ 3D场景如何加事件？

Question

 <Viewport3D x:Name="viewPort3D" RenderOptions.EdgeMode="Aliased" ClipToBounds="False">
                <Viewport3D.Camera>
                    <PerspectiveCamera Position="0,1,0"  LookDirection="0,0,-1" UpDirection="0,1,0"  FieldOfView="40"   />
                    
                </Viewport3D.Camera>
                <ModelVisual3D>
                    <ModelVisual3D.Content>
                        <AmbientLight Color="White"/>
                    </ModelVisual3D.Content>
                </ModelVisual3D>
                <ModelVisual3D >
                    <ModelVisual3D.Content> 
                        <Model3DGroup x:Name="model3DGroup">
                            <Model3DGroup.Children> 
                                <GeometryModel3D  x:Name="right" Geometry="{StaticResource Geometry}"  >
                                    <GeometryModel3D.Transform>
                                        <Transform3DGroup>
                                            <RotateTransform3D>
                                                <RotateTransform3D.Rotation>
                                                    <AxisAngleRotation3D Axis="0,0,0" Angle="0"/>
                                                </RotateTransform3D.Rotation>
                                            </RotateTransform3D>
                                            <TranslateTransform3D OffsetX="0" OffsetY="0" OffsetZ="-50" />
                                        </Transform3DGroup>
                                    </GeometryModel3D.Transform>
                                    <GeometryModel3D.Material>
                                        <DiffuseMaterial>
                                            <DiffuseMaterial.Brush>
                                                <ImageBrush ImageSource="Resources\Images\6.jpg"> 
                                                </ImageBrush> 
                                            </DiffuseMaterial.Brush>
                                        </DiffuseMaterial>
                                    </GeometryModel3D.Material>
                                  
                                </GeometryModel3D>
                          
                            </Model3DGroup.Children>
                        </Model3DGroup>
                    </ModelVisual3D.Content>
                </ModelVisual3D>
            </Viewport3D>我想在那个图上鼠标加事件，但是好像没有可加事件的属性支持，但是我想不至于不能添加事件吧，要不然能看不能摸有什么意思呢。不知道微软是怎么处理的？（我想微软的人不至于搞出来的东西不支持事件吧）

Answer 1

WPF中虚拟的3D物体（比如说帖上去的一个图片）就不能获取事件啦？

Answer 2

微软就将事件给了Viewport3D这个对象，其包含的子元素如何才能获得被鼠标点击呢？难道鼠标不能进入3D的这个虚拟结界内？没道理啊

Answer 3

Wpf鼠标事件是路由事件，可以是冒泡和隧道方式的，Viewport3D的鼠标事件同样能捕捉它内部子元素的鼠标事件，前提是内部子元素也有鼠标事件；事实上，你点击的区域虽然在Viewport3D的范围内，但是触发事件的元素可能是Viewport3D的子元素，但是Viewport3D同样能捕捉到事件

Answer 4

举个简单的例子：<Grid MouseLeftButtonDown="M_1">
  <TextBlock MouseLeftButtonDown="M_2"/>
</Grid>你点击TextBlock，会同时触发M_1和M_2的事件，但是并不意味着，你同时点击了TextBlock和Grid，Grid的事件是TextBlock通过冒泡方式传递给Grid如果TextBlock不支持MouseLeftButtonDown，则Grid 也不能触发MouseLeftButtonDown；同样的道理，假如Viewport3D内部的子元素如果支持鼠标路由事件，那么Viewport3D也可以捕捉到，假如Viewport3D内部的子元素不支持鼠标事件，不但子元素捕捉不到，Viewport3D也捕捉不到

Answer 5

“假如Viewport3D内部的子元素不支持鼠标事件”里面的元素是不支持事件哦。只有参考3D象棋的方法咯。
ChessPiece GetHitTestResult(Point location)
        {
            HitTestResult result = VisualTreeHelper.HitTest(_3DChess, location);
            if (result != null && result.VisualHit is ChessPiece)
            {
                ChessPiece visual = (ChessPiece)result.VisualHit;
                return visual;
            }
            return null;
        }