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#!/usr/bin/env python
import vtk
from vtk.test import Testing
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Interpolate onto a volume
# Parameters for debugging
NPts = 1000000
math = vtk.vtkMath()
math.RandomSeed(31415)
# create pipeline
#
points = vtk.vtkBoundedPointSource()
points.SetNumberOfPoints(NPts)
points.ProduceRandomScalarsOn()
points.ProduceCellOutputOff()
points.Update()
# Create a sphere implicit function
sphere = vtk.vtkSphere()
sphere.SetCenter(0.9,0.1,0.1)
sphere.SetRadius(0.33)
# Extract points within sphere
extract = vtk.vtkFitImplicitFunction()
extract.SetInputConnection(points.GetOutputPort())
extract.SetImplicitFunction(sphere)
extract.SetThreshold(0.005)
# Time execution
timer = vtk.vtkTimerLog()
timer.StartTimer()
extract.Update()
timer.StopTimer()
time = timer.GetElapsedTime()
print("Time to extract points: {0}".format(time))
print(" Number removed: {0}".format(extract.GetNumberOfPointsRemoved()))
print(" Original number of points: {0}".format(NPts))
# First output are the non-outliers
extMapper = vtk.vtkPointGaussianMapper()
extMapper.SetInputConnection(extract.GetOutputPort())
extMapper.EmissiveOff()
extMapper.SetScaleFactor(0.0)
extActor = vtk.vtkActor()
extActor.SetMapper(extMapper)
# Create an outline
outline = vtk.vtkOutlineFilter()
outline.SetInputConnection(points.GetOutputPort())
outlineMapper = vtk.vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())
outlineActor = vtk.vtkActor()
outlineActor.SetMapper(outlineMapper)
# Create the RenderWindow, Renderer and both Actors
#
ren0 = vtk.vtkRenderer()
ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren0)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Add the actors to the renderer, set the background and size
#
ren0.AddActor(extActor)
ren0.AddActor(outlineActor)
ren0.SetBackground(0.1, 0.2, 0.4)
renWin.SetSize(250,250)
cam = ren0.GetActiveCamera()
cam.SetFocalPoint(1,1,1)
cam.SetPosition(0,0,0)
ren0.ResetCamera()
ren1.SetActiveCamera(cam)
iren.Initialize()
# render the image
#
renWin.Render()
#iren.Start()
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