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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()
# Subsample
subsample = vtk.vtkVoxelGrid()
subsample.SetInputConnection(points.GetOutputPort())
subsample.SetConfigurationStyleToAutomatic()
# Time execution
timer = vtk.vtkTimerLog()
timer.StartTimer()
subsample.Update()
timer.StopTimer()
time = timer.GetElapsedTime()
print("Time to subsample: {0}".format(time))
print(" Original number of points: {0}".format(NPts))
print(" Final number of points: {0}".format(subsample.GetOutput().GetNumberOfPoints()))
# Output the original points
subMapper = vtk.vtkPointGaussianMapper()
subMapper.SetInputConnection(points.GetOutputPort())
subMapper.EmissiveOff()
subMapper.SetScaleFactor(0.0)
subActor = vtk.vtkActor()
subActor.SetMapper(subMapper)
# Create an outline
outline = vtk.vtkOutlineFilter()
outline.SetInputConnection(points.GetOutputPort())
outlineMapper = vtk.vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())
outlineActor = vtk.vtkActor()
outlineActor.SetMapper(outlineMapper)
# Output the subsampled points
subMapper1 = vtk.vtkPointGaussianMapper()
subMapper1.SetInputConnection(subsample.GetOutputPort())
subMapper1.EmissiveOff()
subMapper1.SetScaleFactor(0.0)
subActor1 = vtk.vtkActor()
subActor1.SetMapper(subMapper1)
# Create an outline
outline1 = vtk.vtkOutlineFilter()
outline1.SetInputConnection(points.GetOutputPort())
outlineMapper1 = vtk.vtkPolyDataMapper()
outlineMapper1.SetInputConnection(outline1.GetOutputPort())
outlineActor1 = vtk.vtkActor()
outlineActor1.SetMapper(outlineMapper1)
# Create the RenderWindow, Renderer and both Actors
#
ren0 = vtk.vtkRenderer()
ren0.SetViewport(0,0,.5,1)
ren1 = vtk.vtkRenderer()
ren1.SetViewport(0.5,0,1,1)
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren0)
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Add the actors to the renderer, set the background and size
#
ren0.AddActor(subActor)
ren0.AddActor(outlineActor)
ren0.SetBackground(0.1, 0.2, 0.4)
ren1.AddActor(subActor1)
ren1.AddActor(outlineActor1)
ren1.SetBackground(0.1, 0.2, 0.4)
renWin.SetSize(500,250)
cam = ren0.GetActiveCamera()
cam.SetFocalPoint(0,0,0)
cam.SetPosition(1,1,1)
ren0.ResetCamera()
ren1.SetActiveCamera(cam)
iren.Initialize()
# render the image
#
renWin.Render()
#iren.Start()
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