Viewport3D外部的RenderTargetBitmap和ViewPort3D渲染边距
Viewport3D外部的RenderTargetBitmap和ViewPort3D渲染边距
提问于 2013-11-20 08:20:32
这是一个奇怪的问题，但我发现RenderTargetBitmap函数呈现了ViewPort3D左边的边距。当我保存位图(本例中为PNG)时，最终图像的左手边有一个间隙，而右手边被切掉了相同的量。ViewPort3D的尺寸为550px高，1024px宽。我在RenderTargetBitmap方法中使用了相同的维度。我很难理解为什么它会超出定义的界限。
<Grid>
<Button Content="Save Snapshot" HorizontalAlignment="Left" Name="btnSaveSnapshot" VerticalAlignment="Top" Width="100" Margin="8,8,0,0"/>
<Viewport3D Name="vp3dTiles" Height="550" Width="1024" UseLayoutRounding="True" HorizontalAlignment="Center" VerticalAlignment="Bottom" >
<Viewport3D.Camera>
<PerspectiveCamera Position="384,1750,174" LookDirection="0,-.65,-0.25" UpDirection="0,0,1" FieldOfView="65"/>
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<AmbientLight Color="white" />
<GeometryModel3D>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="0,0,0 768,0,0 768,1408,0 0,1408,0 " TriangleIndices="0 1 3 1 2 3" TextureCoordinates="0,0 760,0 760,1408 0,1408 "/>
</GeometryModel3D.Geometry>
<GeometryModel3D.Material>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<ImageBrush ViewportUnits="Absolute" TileMode="Tile" ImageSource="FlorVintage_FINAL.png" Viewport="0,0,768,1408" ViewboxUnits="Absolute" Stretch="None" AlignmentY="Top" RenderOptions.BitmapScalingMode="NearestNeighbor" AlignmentX="Left" />
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</GeometryModel3D.Material>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>
</Grid>和后面的代码(在VB中-对不起)：
Private Sub btnSaveSnapshot_Click(sender As Object, e As RoutedEventArgs) Handles btnSaveSnapshot.Click
Dim bmp As New RenderTargetBitmap(1024, 550, 96, 96, PixelFormats.Pbgra32)
bmp.Render(Me.vp3dTiles)
Dim png As New PngBitmapEncoder()
png.Frames.Add(BitmapFrame.Create(bmp))
Using stm As Stream = File.Create(My.Settings.FileSavePath & "\" & "TestSnapshot.png")
png.Save(stm)
End Using
End Sub我认为这是它所在的容器(网格)可能是问题所在。
回答 2
Stack Overflow用户
发布于 2013-11-20 09:52:32
我有一个答案-定义网格的行和列，并将列宽设置为与ViewPort3D相同(只有1列)。我还必须在窗口中左对齐网格(如图所示)。不幸的是，ViewPort是左对齐的-尽管它被设置为居中-参见代码-这没有任何意义，但我可以处理丑陋的屏幕。
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="40" ></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1024" MaxWidth="1024" MinWidth="1024"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Button Content="Save Snapshot" Grid.Row="0" HorizontalAlignment="Left" Name="btnSaveSnapshot" VerticalAlignment="Top" Width="100" Margin="8,8,0,0"/>
<Viewport3D Name="vp3dTiles" Grid.Row="1" Height="550" Width="1024" UseLayoutRounding="True" HorizontalAlignment="Center" VerticalAlignment="Bottom" >
<Viewport3D.Camera>
<PerspectiveCamera Position="384,1750,174" LookDirection="0,-.65,-0.25" UpDirection="0,0,1" FieldOfView="65"/>
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<AmbientLight Color="white" />
<GeometryModel3D>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="0,0,0 768,0,0 768,1408,0 0,1408,0 " TriangleIndices="0 1 3 1 2 3" TextureCoordinates="0,0 760,0 760,1408 0,1408 "/>
</GeometryModel3D.Geometry>
<GeometryModel3D.Material>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<ImageBrush ViewportUnits="Absolute" TileMode="Tile" ImageSource="FlorVintage_FINAL.png" Viewport="0,0,768,1408" ViewboxUnits="Absolute" Stretch="None" AlignmentY="Top" RenderOptions.BitmapScalingMode="NearestNeighbor" AlignmentX="Left" />
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</GeometryModel3D.Material>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>
</Grid>Stack Overflow用户
发布于 2014-03-27 01:31:41
渲染时，视觉大小需要与渲染大小匹配，并且需要更新。我使用以下代码：
Dim imageWidth As Double = 2448
Dim imageHeight As Double = 2050
myviewport.Width = imageWidth / 2
myviewport.Height = imageHeight / 2
myviewport.Measure(New Size(imageWidth / 2, imageHeight / 2))
myviewport.Arrange(New Rect(0, 0, imageWidth / 2, imageHeight / 2))
'Capture Image here
myviewport.Width = Double.NaN 'restore previous value here
myviewport.Width = Double.NaN 'restore previous value here页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/20085003
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