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86 lines
2.8 KiB
86 lines
2.8 KiB
2 years ago
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#!/usr/bin/env python
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# Demonstrate how to use the vtkBoxWidget 3D widget. This script uses
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# a 3D box widget to define a "clipping box" to clip some simple
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# geometry (a mace). Make sure that you hit the "i" key to activate
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# the widget.
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import vtk
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# Create a mace out of filters.
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sphere = vtk.vtkSphereSource()
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cone = vtk.vtkConeSource()
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glyph = vtk.vtkGlyph3D()
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glyph.SetInputConnection(sphere.GetOutputPort())
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glyph.SetSource(cone.GetOutput())
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glyph.SetVectorModeToUseNormal()
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glyph.SetScaleModeToScaleByVector()
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glyph.SetScaleFactor(0.25)
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# The sphere and spikes are appended into a single polydata. This just
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# makes things simpler to manage.
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apd = vtk.vtkAppendPolyData()
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apd.AddInput(glyph.GetOutput())
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apd.AddInput(sphere.GetOutput())
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maceMapper = vtk.vtkPolyDataMapper()
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maceMapper.SetInputConnection(apd.GetOutputPort())
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maceActor = vtk.vtkLODActor()
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maceActor.SetMapper(maceMapper)
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maceActor.VisibilityOn()
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# This portion of the code clips the mace with the vtkPlanes implicit
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# function. The clipped region is colored green.
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planes = vtk.vtkPlanes()
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clipper = vtk.vtkClipPolyData()
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clipper.SetInputConnection(apd.GetOutputPort())
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clipper.SetClipFunction(planes)
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clipper.InsideOutOn()
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selectMapper = vtk.vtkPolyDataMapper()
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selectMapper.SetInputConnection(clipper.GetOutputPort())
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selectActor = vtk.vtkLODActor()
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selectActor.SetMapper(selectMapper)
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selectActor.GetProperty().SetColor(0, 1, 0)
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selectActor.VisibilityOff()
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selectActor.SetScale(1.01, 1.01, 1.01)
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# Create the RenderWindow, Renderer and both Actors
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ren = vtk.vtkRenderer()
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer(ren)
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iren = vtk.vtkRenderWindowInteractor()
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iren.SetRenderWindow(renWin)
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# The SetInteractor method is how 3D widgets are associated with the
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# render window interactor. Internally, SetInteractor sets up a bunch
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# of callbacks using the Command/Observer mechanism (AddObserver()).
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boxWidget = vtk.vtkBoxWidget()
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boxWidget.SetInteractor(iren)
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boxWidget.SetPlaceFactor(1.25)
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ren.AddActor(maceActor)
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ren.AddActor(selectActor)
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# Add the actors to the renderer, set the background and size
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ren.SetBackground(0.1, 0.2, 0.4)
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renWin.SetSize(300, 300)
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# This callback funciton does the actual work: updates the vtkPlanes
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# implicit function. This in turn causes the pipeline to update.
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def SelectPolygons(object, event):
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# object will be the boxWidget
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global selectActor, planes
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object.GetPlanes(planes)
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selectActor.VisibilityOn()
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# Place the interactor initially. The input to a 3D widget is used to
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# initially position and scale the widget. The "EndInteractionEvent" is
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# observed which invokes the SelectPolygons callback.
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boxWidget.SetInput(glyph.GetOutput())
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boxWidget.PlaceWidget()
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boxWidget.AddObserver("EndInteractionEvent", SelectPolygons)
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iren.Initialize()
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renWin.Render()
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iren.Start()
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