/usr/share/vtk/Modelling/Python/PerlinTerrain.py is in vtk-examples 5.8.0-17.5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | #!/usr/bin/env python
# This example demonstrates how to combine a "geometric" implicit
# function with noise at different frequencies to produce the
# appearance of a landscape.
import vtk
plane = vtk.vtkPlane()
p1 = vtk.vtkPerlinNoise()
p1.SetFrequency(1, 1, 0)
p2 = vtk.vtkPerlinNoise()
p2.SetFrequency(3, 5, 0)
p2.SetPhase(0.5, 0.5, 0)
p3 = vtk.vtkPerlinNoise()
p3.SetFrequency(16, 16, 0)
sum = vtk.vtkImplicitSum()
sum.SetNormalizeByWeight(1)
sum.AddFunction(plane)
sum.AddFunction(p1, 0.2)
sum.AddFunction(p2, 0.1)
sum.AddFunction(p3, 0.02)
sample = vtk.vtkSampleFunction()
sample.SetImplicitFunction(sum)
sample.SetSampleDimensions(65, 65, 20)
sample.SetModelBounds(-1, 1, -1, 1, -0.5, 0.5)
sample.ComputeNormalsOff()
surface = vtk.vtkContourFilter()
surface.SetInputConnection(sample.GetOutputPort())
surface.SetValue(0, 0.0)
smooth = vtk.vtkPolyDataNormals()
smooth.SetInputConnection(surface.GetOutputPort())
smooth.SetFeatureAngle(90)
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(smooth.GetOutputPort())
mapper.ScalarVisibilityOff()
actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetColor(0.4, 0.2, 0.1)
# Create the renderer etc.
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Add the actors to the renderer, set the background and size
ren.AddActor(actor)
ren.SetBackground(1, 1, 1)
renWin.SetSize(500, 500)
ren.ResetCamera()
ren.GetActiveCamera().Elevation(-45)
ren.GetActiveCamera().Azimuth(10)
ren.GetActiveCamera().Dolly(1.35)
ren.ResetCameraClippingRange()
iren.Initialize()
renWin.Render()
iren.Start()
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