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#!/usr/bin/env python
from vtkmodules.vtkCommonDataModel import vtkCylinder
from vtkmodules.vtkFiltersGeneral import vtkSampleImplicitFunctionFilter
from vtkmodules.vtkFiltersModeling import vtkOutlineFilter
from vtkmodules.vtkFiltersSources import vtkPointSource
from vtkmodules.vtkRenderingCore import (
vtkActor,
vtkPointGaussianMapper,
vtkPolyDataMapper,
vtkRenderWindow,
vtkRenderWindowInteractor,
vtkRenderer,
)
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Parameters for debugging
NPts = 100000
# create pipeline
#
points = vtkPointSource()
points.SetNumberOfPoints(NPts)
points.SetRadius(5)
# create some scalars based on implicit function
# Create a cylinder
cyl = vtkCylinder()
cyl.SetCenter(0,0,0)
cyl.SetRadius(0.1)
# Generate scalars and vector
sample = vtkSampleImplicitFunctionFilter()
sample.SetInputConnection(points.GetOutputPort())
sample.SetImplicitFunction(cyl)
sample.Update()
print(sample.GetOutput().GetScalarRange())
# Draw the points
sampleMapper = vtkPointGaussianMapper()
sampleMapper.SetInputConnection(sample.GetOutputPort(0))
sampleMapper.EmissiveOff()
sampleMapper.SetScaleFactor(0.0)
sampleMapper.SetScalarRange(0,20)
sampleActor = vtkActor()
sampleActor.SetMapper(sampleMapper)
# Create an outline
outline = vtkOutlineFilter()
outline.SetInputConnection(sample.GetOutputPort())
outlineMapper = vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())
outlineActor = vtkActor()
outlineActor.SetMapper(outlineMapper)
# Create the RenderWindow, Renderer and both Actors
#
ren0 = vtkRenderer()
renWin = vtkRenderWindow()
renWin.AddRenderer(ren0)
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Add the actors to the renderer, set the background and size
#
ren0.AddActor(sampleActor)
ren0.AddActor(outlineActor)
ren0.SetBackground(0.1, 0.2, 0.4)
renWin.SetSize(250,250)
cam = ren0.GetActiveCamera()
cam.SetFocalPoint(0,0,0)
cam.SetPosition(1,1,1)
ren0.ResetCamera()
iren.Initialize()
# render the image
#
renWin.Render()
#iren.Start()
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