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我正在使用 vtkImageViewer 类来可视化 3D 体积中的不同平面。然后我喜欢叠加一条垂直线和一条水平线来标记当前鼠标位置。我使用以下代码将 vtkActor2D 添加到查看器：

    imageViewer = vtk.vtkImageViewer()        
    ...
    line = vtk.vtkLineSource()
    line.SetResolution(20)
    mapper = vtk.vtkPolyDataMapper2D()
    mapper.SetInputConnection(line.GetOutputPort())
    actor = vtk.vtkActor2D()
    actor.SetMapper(mapper)
    imageViewer.GetRenderer().AddActor2D(actor)
    ...
    line.SetPoint1(x,0.0,0.0)
    line.SetPoint2(x,y,0.0)
    actor.GetProperty().SetColor(color)
    actor.GetProperty().SetOpacity(0.75)
    ...
    imageViewer.Render()

在 Mac OS X 上它按预期工作，但是当我在我的 Windows 机器上尝试时，这条线根本不显示。

更新：如果我更改为 vtkActor，而不是在 imageViewer 后面渲染演员，我如何将 vtkActor 带到前台？

    imageViewer = vtk.vtkImageViewer()        
    ...
    line = vtk.vtkLineSource()
    line.SetResolution(20)
    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInputConnection(line.GetOutputPort())
    actor = vtk.vtkActor()
    actor.SetMapper(mapper)
    imageViewer.GetRenderer().AddActor(actor)
    ...
    line.SetPoint1(x,0.0,0.0)
    line.SetPoint2(x,y,0.0)
    actor.GetProperty().SetColor(color)
    actor.GetProperty().SetOpacity(0.75)
    ...
    imageViewer.Render()
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