# Frustum

VTKExamples/Python/GeometricObjects/Frustum

### Description

This is a Python version of the C++ example for viewing a Frustum

### Code

Frustum.py

    #!/usr/bin/env python

    import vtk

    # create a rendering window and renderer
    ren = vtk.vtkRenderer()
    renWin = vtk.vtkRenderWindow()
    renWin.AddRenderer(ren)

    # create a renderwindowinteractor
    iren = vtk.vtkRenderWindowInteractor()
    iren.SetRenderWindow(renWin)

    planesArray = [0] * 24  # Allocate a list of length 24
    camera = vtk.vtkCamera()
    camera.GetFrustumPlanes(1, planesArray)
    planes = vtk.vtkPlanes()
    planes.SetFrustumPlanes(planesArray)

    frustumSource = vtk.vtkFrustumSource()
    frustumSource.SetPlanes(planes)
    frustumSource.ShowLinesOff()
    frustumSource.Update()

    # mapper
    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInputData(frustumSource.GetOutput())

    # actor
    actor = vtk.vtkActor()
    actor.SetMapper(mapper)
    actor.GetProperty().SetColor(0.8, 0.9, 0.7)

    # assign actor to the renderer
    ren.AddActor(actor)
    ren.SetBackground(0.2, 0.1, 0.3)
    # enable user interface interactor
    iren.Initialize()
    renWin.Render()
    iren.Start()