HyperTreeGridSource

#!/usr/bin/env python
import vtk


def main():
    colors = vtk.vtkNamedColors()
    # Create hyper tree grid source

    descriptor = "RRR .R. .RR ..R ..R .R.|R.......................... " \
                 "........................... ........................... " \
                 ".............R............. ....RR.RR........R......... " \
                 ".....RRRR.....R.RR......... ........................... " \
                 "........................... " \
                 "...........................|........................... " \
                 "........................... ........................... " \
                 "...RR.RR.......RR.......... ........................... " \
                 "RR......................... ........................... " \
                 "........................... ........................... " \
                 "........................... ........................... " \
                 "........................... ........................... " \
                 "............RRR............|........................... " \
                 "........................... .......RR.................. " \
                 "........................... ........................... " \
                 "........................... ........................... " \
                 "........................... ........................... " \
                 "........................... " \
                 "...........................|........................... " \
                 "..........................."

    source = vtk.vtkHyperTreeGridSource()
    source.SetMaximumLevel(6)
    source.SetDimensions(4, 4, 3)  # GridCell 3, 3, 2
    source.SetGridScale(1.5, 1.0, 0.7)
    source.SetBranchFactor(4)
    source.SetDescriptor(descriptor)
    source.Update()

    # Hyper tree grid to unstructured grid filter
    htg2ug = vtk.vtkHyperTreeGridToUnstructuredGrid()
    htg2ug.SetInputConnection(source.GetOutputPort())
    htg2ug.Update()

    shrink = vtk.vtkShrinkFilter()
    shrink.SetInputConnection(htg2ug.GetOutputPort())
    shrink.SetShrinkFactor(.8)

    mapper = vtk.vtkDataSetMapper()
    mapper.SetInputConnection(shrink.GetOutputPort())
    mapper.ScalarVisibilityOff()

    actor = vtk.vtkActor()
    actor.SetMapper(mapper)
    actor.GetProperty().SetDiffuseColor(colors.GetColor3d("Burlywood"))

    # Create the RenderWindow, Renderer and Interactor
    renderer = vtk.vtkRenderer()
    renderWindow = vtk.vtkRenderWindow()
    renderWindow.AddRenderer(renderer)
    interactor = vtk.vtkRenderWindowInteractor()
    interactor.SetRenderWindow(renderWindow)

    renderer.SetBackground(colors.GetColor3d("SlateGray"))
    renderer.AddActor(actor)
    renderer.ResetCamera()
    renderer.GetActiveCamera().Azimuth(150)
    renderer.GetActiveCamera().Elevation(30)
    renderer.ResetCameraClippingRange()

    renderWindow.SetSize(640, 480)
    renderWindow.Render()
    renderWindow.SetWindowName("HyperTreeGridSource")

    interactor.Start()


if __name__ == '__main__':
    main()