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  • VTK使用矢量数据弯曲几何体

       vtkWarpVector is a filter that modifies point coordinates by moving points along vector times the scale factor. Useful for showing flow profiles or mechanical deformation. The filter passes both its point data and cell data to its output. 

      沿法向膨胀

    #!/usr/bin/env python
    import vtk
    
    inputPolyData = vtk.vtkPolyData()
    
    sphereSource = vtk.vtkSphereSource()
    sphereSource.SetPhiResolution(15)
    sphereSource.SetThetaResolution(15)
    sphereSource.Update()
    inputPolyData = sphereSource.GetOutput()
    
    # merge duplicate points, and/or remove unused points and/or remove degenerate cells
    clean = vtk.vtkCleanPolyData()
    clean.SetInputData(inputPolyData)
    
    # Generate normals
    normals = vtk.vtkPolyDataNormals()
    normals.SetInputConnection(clean.GetOutputPort())
    normals.SplittingOff()
    
    # vtkWarpVector is a filter that modifies point coordinates by moving points along vector times the scale factor
    # Warp using the normals (deform geometry with vector data)
    warp = vtk.vtkWarpVector() 
    warp.SetInputConnection(normals.GetOutputPort())
    
    # Set the input data arrays that this algorithm will process
    # The fieldAssociation refers to which field in the data object the array is stored
    warp.SetInputArrayToProcess(0, 0, 0,vtk.vtkDataObject.FIELD_ASSOCIATION_POINTS, vtk.vtkDataSetAttributes.NORMALS)
    
    # Specify value to scale displacement
    warp.SetScaleFactor(1.0) 
    
    # Visualize the original and warped models
    colors = vtk.vtkNamedColors()
    
    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInputConnection(warp.GetOutputPort())
    
    warpedActor = vtk.vtkActor()
    warpedActor.SetMapper(mapper)
    warpedActor.GetProperty().SetColor(colors.GetColor3d("Flesh"))
    
    originalMapper = vtk.vtkPolyDataMapper()
    originalMapper.SetInputConnection(normals.GetOutputPort())
    
    originalActor = vtk.vtkActor()
    originalActor.SetMapper(originalMapper)
    originalActor.GetProperty().SetInterpolationToFlat() # Set the shading interpolation method for an object
    originalActor.GetProperty().SetColor(colors.GetColor3d("Flesh"))
    
    renderWindow =vtk.vtkRenderWindow()
    renderWindow.SetSize(640, 480)
    
    # Create a camera for all renderers
    camera = vtk.vtkCamera()
    
    # Define viewport ranges: (xmin, ymin, xmax, ymax)
    leftViewport = [0.0, 0.0, 0.5, 1.0]
    rightViewport =[0.5, 0.0, 1.0, 1.0]
    
    # Setup both renderers
    leftRenderer = vtk.vtkRenderer()
    leftRenderer.SetViewport(leftViewport)
    leftRenderer.SetBackground(colors.GetColor3d("Burlywood"))
    leftRenderer.SetActiveCamera(camera)
    
    rightRenderer = vtk.vtkRenderer()
    rightRenderer.SetViewport(rightViewport)
    rightRenderer.SetBackground(colors.GetColor3d("CornFlower"))
    rightRenderer.SetActiveCamera(camera)
    
    leftRenderer.AddActor(originalActor)
    rightRenderer.AddActor(warpedActor)
    
    rightRenderer.ResetCamera()
    
    renderWindow.AddRenderer(rightRenderer)
    renderWindow.AddRenderer(leftRenderer)
    
    style = vtk.vtkInteractorStyleTrackballCamera()
    
    interactor = vtk.vtkRenderWindowInteractor()
    interactor.SetRenderWindow(renderWindow)
    interactor.SetInteractorStyle(style)
    
    renderWindow.Render()
    interactor.Start()
    View Code

       膨胀导入的STL模型

    #!/usr/bin/env python
    import vtk
    
    inputPolyData = vtk.vtkPolyData()
    
    readerSTL = vtk.vtkSTLReader()
    readerSTL.SetFileName("Suzanne.stl")
    readerSTL.Update()
    inputPolyData = readerSTL.GetOutput()
    
    # merge duplicate points, and/or remove unused points and/or remove degenerate cells
    clean = vtk.vtkCleanPolyData()
    clean.SetInputData(inputPolyData)
    
    # Generate normals
    normals = vtk.vtkPolyDataNormals()
    normals.SetInputConnection(clean.GetOutputPort())
    normals.SplittingOff() # Turn off the splitting of sharp edges
    
    # vtkWarpVector is a filter that modifies point coordinates by moving points along vector times the scale factor
    # Warp using the normals (deform geometry with vector data)
    warp = vtk.vtkWarpVector() 
    warp.SetInputConnection(normals.GetOutputPort())
    
    # Set the input data arrays that this algorithm will process
    # The fieldAssociation refers to which field in the data object the array is stored
    warp.SetInputArrayToProcess(0, 0, 0,vtk.vtkDataObject.FIELD_ASSOCIATION_POINTS, vtk.vtkDataSetAttributes.NORMALS)
    
    # Specify value to scale displacement
    warp.SetScaleFactor(0.3) 
    
    # Visualize the original and warped models
    colors = vtk.vtkNamedColors()
    
    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInputConnection(warp.GetOutputPort())
    
    warpedActor = vtk.vtkActor()
    warpedActor.SetMapper(mapper)
    warpedActor.GetProperty().SetColor(colors.GetColor3d("Flesh"))
    
    originalMapper = vtk.vtkPolyDataMapper()
    originalMapper.SetInputConnection(normals.GetOutputPort())
    
    originalActor = vtk.vtkActor()
    originalActor.SetMapper(originalMapper)
    originalActor.GetProperty().SetInterpolationToFlat() # Set the shading interpolation method for an object
    originalActor.GetProperty().SetColor(colors.GetColor3d("Flesh"))
    
    renderWindow =vtk.vtkRenderWindow()
    renderWindow.SetSize(640, 480)
    
    # Create a camera for all renderers
    camera = vtk.vtkCamera()
    
    # Define viewport ranges: (xmin, ymin, xmax, ymax)
    leftViewport = [0.0, 0.0, 0.5, 1.0]
    rightViewport =[0.5, 0.0, 1.0, 1.0]
    
    # Setup both renderers
    leftRenderer = vtk.vtkRenderer()
    leftRenderer.SetViewport(leftViewport)
    leftRenderer.SetBackground(colors.GetColor3d("Burlywood"))
    leftRenderer.SetActiveCamera(camera)
    
    rightRenderer = vtk.vtkRenderer()
    rightRenderer.SetViewport(rightViewport)
    rightRenderer.SetBackground(colors.GetColor3d("CornFlower"))
    rightRenderer.SetActiveCamera(camera)
    
    leftRenderer.AddActor(originalActor)
    rightRenderer.AddActor(warpedActor)
    
    rightRenderer.ResetCamera()
    
    renderWindow.AddRenderer(rightRenderer)
    renderWindow.AddRenderer(leftRenderer)
    
    style = vtk.vtkInteractorStyleTrackballCamera()
    
    interactor = vtk.vtkRenderWindowInteractor()
    interactor.SetRenderWindow(renderWindow)
    interactor.SetInteractorStyle(style)
    
    renderWindow.Render()
    interactor.Start()
    View Code

     

     

     

     

    参考:

    VTK: vtkWarpVector Class Reference

    VTK/Examples/Cxx/PolyData/WarpSurface

    VTK/Examples/Python/PolyData/WarpVector.py

    An algorithm for inflating/deflating (offsetting, buffering) polygons

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  • 原文地址:https://www.cnblogs.com/21207-iHome/p/9130186.html
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