本文 以 Python 语言开发

我们在做三维软件开发时，经常会用到相机坐标轴，来指示当前空间位置；

坐标轴效果：

相机方向坐标轴

 Cube 正方体坐标轴

 自定义坐标轴：

Code：

Axes

def main():
    colors = vtkNamedColors()

    # create a Sphere
    sphereSource = vtkSphereSource()
    sphereSource.SetCenter(0.0, 0.0, 0.0)
    sphereSource.SetRadius(0.5)

    # create a mapper
    sphereMapper = vtkPolyDataMapper()
    sphereMapper.SetInputConnection(sphereSource.GetOutputPort())

    # create an actor
    sphereActor = vtkActor()
    sphereActor.SetMapper(sphereMapper)

    # a renderer and render window
    renderer = vtkRenderer()
    renderWindow = vtkRenderWindow()
    renderWindow.SetWindowName('Axes')
    renderWindow.AddRenderer(renderer)

    # an interactor
    renderWindowInteractor = vtkRenderWindowInteractor()
    renderWindowInteractor.SetRenderWindow(renderWindow)

    # add the actors to the scene
    renderer.AddActor(sphereActor)
    renderer.SetBackground(colors.GetColor3d('SlateGray'))

    transform = vtkTransform()
    transform.Translate(1.0, 0.0, 0.0)

    axes = vtkAxesActor()
    #  The axes are positioned with a user transform
    axes.SetUserTransform(transform)

    # properties of the axes labels can be set as follows
    # this sets the x axis label to red
    axes.GetXAxisCaptionActor2D().GetCaptionTextProperty().SetColor(colors.GetColor3d('Red'));

    # the actual text of the axis label can be changed:
    axes.SetXAxisLabelText('test')
    renderer.AddActor(axes)
    renderer.GetActiveCamera().Azimuth(50)
    renderer.GetActiveCamera().Elevation(-30)

    renderer.ResetCamera()
    renderWindow.SetWindowName('Axes')
    renderWindow.Render()

    # begin mouse interaction
    renderWindowInteractor.Start()


if __name__ == '__main__':
    main()

CameraOrientationWidget

def main():
    colors = vtkNamedColors()

    renderer = vtkRenderer()
    ren_win = vtkRenderWindow()
    interactor = vtkRenderWindowInteractor()

    sphere_source = vtkSphereSource()
    sphere_source.SetRadius(10.0)

    mapper = vtkPolyDataMapper()
    mapper.SetInputConnection(sphere_source.GetOutputPort())

    actor = vtkActor()
    actor.GetProperty().SetColor(colors.GetColor3d('Beige'))
    actor.SetMapper(mapper)

    renderer.AddActor(actor)
    renderer.SetBackground(colors.GetColor3d('DimGray'))

    ren_win.AddRenderer(renderer)
    ren_win.SetSize(600, 600)
    ren_win.SetWindowName('CameraOrientationWidget')

    # Important: The interactor must be set prior to enabling the widget.
    interactor.SetRenderWindow(ren_win)

    cam_orient_manipulator = vtkCameraOrientationWidget()
    cam_orient_manipulator.SetParentRenderer(renderer)
    # Enable the widget.
    cam_orient_manipulator.On()

    ren_win.Render()
    interactor.Initialize()
    interactor.Start()


if __name__ == "__main__":
    main()

OrientationMarkerWidget

   colors = vtkNamedColors()
    # create a rendering window and renderer
    ren = vtkRenderer()
    ren_win = vtkRenderWindow()
    ren_win.AddRenderer(ren)
    ren_win.SetWindowName('OrientationMarkerWidget')

    # create a renderwindowinteractor
    iren = vtkRenderWindowInteractor()
    iren.SetRenderWindow(ren_win)

    cube = vtkCubeSource()
    cube.SetXLength(200)
    cube.SetYLength(200)
    cube.SetZLength(200)
    cube.Update()
    cm = vtkPolyDataMapper()
    cm.SetInputConnection(cube.GetOutputPort())
    ca = vtkActor()
    ca.SetMapper(cm)
    ca.GetProperty().SetColor(colors.GetColor3d("BurlyWood"))
    ca.GetProperty().EdgeVisibilityOn()
    ca.GetProperty().SetEdgeColor(colors.GetColor3d("Red"))

    # assign actor to the renderer
    ren.AddActor(ca)
    ren.SetBackground(colors.GetColor3d('CornflowerBlue'))

    axes_actor = vtkAnnotatedCubeActor()
    axes_actor.SetXPlusFaceText('L')
    axes_actor.SetXMinusFaceText('R')
    axes_actor.SetYMinusFaceText('I')
    axes_actor.SetYPlusFaceText('S')
    axes_actor.SetZMinusFaceText('P')
    axes_actor.SetZPlusFaceText('A')
    axes_actor.GetTextEdgesProperty().SetColor(colors.GetColor3d("Yellow"))
    axes_actor.GetTextEdgesProperty().SetLineWidth(2)
    axes_actor.GetCubeProperty().SetColor(colors.GetColor3d("Blue"))
    axes = vtkOrientationMarkerWidget()
    axes.SetOrientationMarker(axes_actor)
    axes.SetInteractor(iren)
    axes.EnabledOn()
    axes.InteractiveOn()
    ren.ResetCamera()

    # enable user interface interactor
    iren.Initialize()
    ren_win.Render()
    ren.GetActiveCamera().Azimuth(45)
    ren.GetActiveCamera().Elevation(30)
    ren_win.Render()
    iren.Start()

custom OrientationMarker

    colors = vtkNamedColors()

    reader = vtkXMLPolyDataReader()
    reader.SetFileName("./Human.vtp")

    icon_mapper = vtkDataSetMapper()
    icon_mapper.SetInputConnection(reader.GetOutputPort())

    icon_actor = vtkActor()
    icon_actor.SetMapper(icon_mapper)
    icon_actor.GetProperty().SetColor(colors.GetColor3d('Silver'))

    # Set up the renderer, window, and interactor
    renderer = vtkRenderer()
    renderer.SetBackground(colors.GetColor3d('SlateGray'))

    ren_win = vtkRenderWindow()
    ren_win.AddRenderer(renderer)
    ren_win.SetSize(400, 400)
    ren_win.SetWindowName('OrientationMarkerWidget1')

    iren = vtkRenderWindowInteractor()
    iren.SetRenderWindow(ren_win)

    rgb = [0.0, 0.0, 0.0]
    colors.GetColorRGB('Wheat', rgb)
    # Set up the widget
    widget = vtkOrientationMarkerWidget()
    widget.SetOrientationMarker(icon_actor)
    widget.SetInteractor(iren)
    widget.SetViewport(0.0, 0.0, 0.3, 0.3)
    widget.SetOutlineColor(*rgb)
    widget.SetEnabled(1)
    widget.InteractiveOn()

    # Create a superquadric
    superquadric_source = vtkSuperquadricSource()
    superquadric_source.SetPhiRoundness(.001)
    superquadric_source.SetThetaRoundness(.04)

    # Create a mapper and actor
    superquadric_mapper = vtkPolyDataMapper()
    superquadric_mapper.SetInputConnection(superquadric_source.GetOutputPort())

    superquadric_actor = vtkActor()
    superquadric_actor.SetMapper(superquadric_mapper)
    superquadric_actor.GetProperty().SetInterpolationToFlat()
    superquadric_actor.GetProperty().SetDiffuseColor(colors.GetColor3d('Carrot'))
    superquadric_actor.GetProperty().SetSpecularColor(colors.GetColor3d('White'))
    superquadric_actor.GetProperty().SetDiffuse(0.6)
    superquadric_actor.GetProperty().SetSpecular(0.5)
    superquadric_actor.GetProperty().SetSpecularPower(5.0)

    renderer.AddActor(superquadric_actor)
    renderer.ResetCamera()

    ren_win.Render()

    iren.Initialize()

    iren.Start()