MultiBlockDataSet
vtk-examples/Python/CompositeData/MultiBlockDataSet
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Code¶
MultiBlockDataSet.py
#!/usr/bin/env python
import vtk
def main():
colors = vtk.vtkNamedColors()
# PART 1 Make some Data.
# Make a tree.
root = vtk.vtkMultiBlockDataSet()
branch = vtk.vtkMultiBlockDataSet()
root.SetBlock(0, branch)
# Make some leaves.
leaf1 = vtk.vtkSphereSource()
leaf1.SetCenter(0, 0, 0)
leaf1.Update()
branch.SetBlock(0, leaf1.GetOutput())
leaf2 = vtk.vtkSphereSource()
leaf2.SetCenter(1.75, 2.5, 0)
leaf2.SetRadius(1.5)
leaf2.Update()
branch.SetBlock(1, leaf2.GetOutput())
leaf3 = vtk.vtkSphereSource()
leaf3.SetCenter(4, 0, 0)
leaf3.SetRadius(2)
leaf3.Update()
root.SetBlock(1, leaf3.GetOutput())
# PART 2 Do something with the data
# a non composite aware filter, the pipeline will iterate
edges = vtk.vtkExtractEdges()
edges.SetInputData(root)
# PART 3 Show the data
# also demonstrate a composite aware filter
# this filter aggregates all blocks into one polydata
# this is handy for display, although fairly limited
# see vtkCompositePolyDataMapper2 for something better
polydata = vtk.vtkCompositeDataGeometryFilter()
polydata.SetInputConnection(edges.GetOutputPort())
# Create the Renderer, RenderWindow, and RenderWindowInteractor.
renderer = vtk.vtkRenderer()
renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(0, polydata.GetOutputPort(0))
actor = vtk.vtkActor()
actor.GetProperty().SetColor(colors.GetColor3d('Yellow'))
actor.GetProperty().SetLineWidth(2)
actor.SetMapper(mapper)
# Enable user interface interactor.
renderer.AddActor(actor)
renderer.SetBackground(colors.GetColor3d('CornflowerBlue'))
renderWindow.SetWindowName('MultiBlockDataSet')
renderWindow.Render()
renderWindowInteractor.Start()
if __name__ == '__main__':
main()