WPF 3D 相机 FieldOfView 参数

Posted 2022-12-15 bcbobo21cn

wpf 3d 相机还有一个视场角参数，FieldOfView；

视场角定义如下，

视场角在光学工程中又称视场，视场角的大小决定了光学仪器的视野范围，视场角又可用FOV表示；

在光学仪器中，以光学仪器的镜头为顶点，以被测目标的物像可通过镜头的最大范围的两条边缘构成的夹角，称为视场角； 
视场角的大小决定了光学仪器的视野范围，视场角越大，视野就越大，光学倍率就越小；通俗地说，目标物体超过这个角就不会被收在镜头里；

做一个立方体，只能看到正面；

<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Grid>  

        <Viewport3D Margin="10">
            <Viewport3D.Camera>
                <PerspectiveCamera Position="0,1,18" FieldOfView="30" x:Name="camera"></PerspectiveCamera>
            </Viewport3D.Camera>
            <Viewport3D.Children>
                <ModelVisual3D>
                    <ModelVisual3D.Content>
                        <Model3DGroup >
                            <GeometryModel3D x:Name="F1">
                                <GeometryModel3D.Material>
                                    <DiffuseMaterial Brush="Green"/>
                                </GeometryModel3D.Material>
                                <GeometryModel3D.Geometry>
                                    <MeshGeometry3D Positions="0,0,0 2,0,0 2,2,0 0,2,0" 
TriangleIndices="0,2,1 0,3,2">
                                    </MeshGeometry3D>
                                </GeometryModel3D.Geometry>
                            </GeometryModel3D>
                            <GeometryModel3D  x:Name="F2">
                                <GeometryModel3D.Material>
                                    <DiffuseMaterial Brush="Blue"/>
                                </GeometryModel3D.Material>
                                <GeometryModel3D.Geometry>
                                    <MeshGeometry3D Positions="0,0,0 0,0,2 0,2,2 0,2,0" 
TriangleIndices="0,1,2 0,2,3">
                                    </MeshGeometry3D>
                                </GeometryModel3D.Geometry>
                            </GeometryModel3D>
                            <GeometryModel3D  x:Name="F3">
                                <GeometryModel3D.Material>
                                    <DiffuseMaterial Brush="Gray"/>
                                </GeometryModel3D.Material>
                                <GeometryModel3D.Geometry>
                                    <MeshGeometry3D Positions="0,0,0 0,0,2 2,0,2 2,0,0" 
TriangleIndices="0,2,1 0,3,2">
                                    </MeshGeometry3D>
                                </GeometryModel3D.Geometry>
                            </GeometryModel3D>
                            <GeometryModel3D  x:Name="F4">
                                <GeometryModel3D.Material>
                                    <DiffuseMaterial Brush="Bisque"/>
                                </GeometryModel3D.Material>
                                <GeometryModel3D.Geometry>
                                    <MeshGeometry3D Positions="2,0,0 2,2,0 2,2,2 2,0,2" 
TriangleIndices="0,1,2 0,2,3">
                                    </MeshGeometry3D>
                                </GeometryModel3D.Geometry>
                            </GeometryModel3D>
                            <GeometryModel3D  x:Name="F5">
                                <GeometryModel3D.Material>
                                    <DiffuseMaterial Brush="Yellow"/>
                                </GeometryModel3D.Material>
                                <GeometryModel3D.Geometry>
                                    <MeshGeometry3D Positions="0,2,2 2,2,2 2,2,0 0,2,0" 
TriangleIndices="0,1,2 0,2,3">
                                    </MeshGeometry3D>
                                </GeometryModel3D.Geometry>
                            </GeometryModel3D>
                            <GeometryModel3D  x:Name="F6">
                                <GeometryModel3D.Material>
                                    <DiffuseMaterial Brush="Red"/>
                                </GeometryModel3D.Material>
                                <GeometryModel3D.Geometry>
                                    <MeshGeometry3D Positions="0,2,2 2,2,2 0,0,2 2,0,2" 
TriangleIndices="0,2,3 0,3,1">
                                    </MeshGeometry3D>
                                </GeometryModel3D.Geometry>
                            </GeometryModel3D>
                        </Model3DGroup>
                    </ModelVisual3D.Content>
                </ModelVisual3D>
                <ModelVisual3D x:Name="light">
                    <ModelVisual3D.Content>
                        <AmbientLight></AmbientLight>
                    </ModelVisual3D.Content>
                </ModelVisual3D>
            </Viewport3D.Children>
        </Viewport3D>
        
  </Grid>
</Page>

调整视场角为不同值时情况如下；

 

 

 

     我还不太理解此参数；看上去值小时物体就大；