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#!/usr/bin/env python
from vtkmodules.vtkCommonCore import (
vtkLookupTable,
vtkMath,
)
from vtkmodules.vtkCommonDataModel import (
vtkDataObject,
vtkDataSetAttributes,
vtkImageData,
vtkSphere,
)
from vtkmodules.vtkFiltersCore import vtkThreshold
from vtkmodules.vtkFiltersGeneral import vtkDiscreteMarchingCubes
from vtkmodules.vtkFiltersGeometry import vtkGeometryFilter
from vtkmodules.vtkImagingCore import vtkImageThreshold
from vtkmodules.vtkImagingHybrid import vtkSampleFunction
from vtkmodules.vtkImagingMath import vtkImageMathematics
from vtkmodules.vtkRenderingCore import (
vtkActor,
vtkPolyDataMapper,
vtkRenderWindow,
vtkRenderWindowInteractor,
vtkRenderer,
)
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Create the RenderWindow, Renderer and both Actors
#
ren1 = vtkRenderer()
renWin = vtkRenderWindow()
renWin.AddRenderer(ren1)
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
math = vtkMath()
# Generate some random colors
def MakeColors (lut, n):
lut.SetNumberOfColors(n)
lut.SetTableRange(0, n - 1)
lut.SetScaleToLinear()
lut.Build()
lut.SetTableValue(0, 0, 0, 0, 1)
math.RandomSeed(5071)
i = 1
while i < n:
lut.SetTableValue(i, math.Random(.2, 1),
math.Random(.2, 1), math.Random(.2, 1), 1)
i += 1
lut = vtkLookupTable()
MakeColors(lut, 256)
n = 20
radius = 10
# This has been moved outside the loop so that the code can be correctly
# translated to python
blobImage = vtkImageData()
i = 0
while i < n:
sphere = vtkSphere()
sphere.SetRadius(radius)
max = 50 - radius
sphere.SetCenter(int(math.Random(-max, max)),
int(math.Random(-max, max)), int(math.Random(-max, max)))
sampler = vtkSampleFunction()
sampler.SetImplicitFunction(sphere)
sampler.SetOutputScalarTypeToFloat()
sampler.SetSampleDimensions(51, 51, 51)
sampler.SetModelBounds(-50, 50, -50, 50, -50, 50)
thres = vtkImageThreshold()
thres.SetInputConnection(sampler.GetOutputPort())
thres.ThresholdByLower(radius * radius)
thres.ReplaceInOn()
thres.ReplaceOutOn()
thres.SetInValue(i + 1)
thres.SetOutValue(0)
thres.Update()
if (i == 0):
blobImage.DeepCopy(thres.GetOutput())
maxValue = vtkImageMathematics()
maxValue.SetInputData(0, blobImage)
maxValue.SetInputData(1, thres.GetOutput())
maxValue.SetOperationToMax()
maxValue.Modified()
maxValue.Update()
blobImage.DeepCopy(maxValue.GetOutput())
i += 1
discrete = vtkDiscreteMarchingCubes()
discrete.SetInputData(blobImage)
discrete.GenerateValues(n, 1, n)
discrete.ComputeAdjacentScalarsOn() # creates PointScalars
thr = vtkThreshold()
thr.SetInputConnection(discrete.GetOutputPort())
thr.SetInputArrayToProcess(0, 0, 0, vtkDataObject.FIELD_ASSOCIATION_POINTS, vtkDataSetAttributes.SCALARS) # act on PointScalars created by ComputeAdjacentScalarsOn
thr.AllScalarsOn() # default, changes better visible
# remove cells between labels, i.e. keep cells neighbouring background (label 0)
thr.SetThresholdFunction(vtkThreshold.THRESHOLD_BETWEEN)
thr.SetLowerThreshold(0.0)
thr.SetUpperThreshold(0.0)
vtu2vtp = vtkGeometryFilter()
vtu2vtp.SetInputConnection(thr.GetOutputPort())
mapper = vtkPolyDataMapper()
mapper.SetInputConnection(vtu2vtp.GetOutputPort())
mapper.SetLookupTable(lut)
mapper.SetScalarModeToUseCellData() # default is to use PointScalars, which get created with ComputeAdjacentScalarsOn
mapper.SetScalarRange(0, lut.GetNumberOfColors())
actor = vtkActor()
actor.SetMapper(mapper)
ren1.AddActor(actor)
renWin.Render()
#iren.Start()
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