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#!/usr/bin/env python
from vtkmodules.vtkCommonDataModel import (
vtkCellArray,
vtkImageData,
vtkPolyData,
vtkSphere,
)
from vtkmodules.vtkFiltersCore import vtkSimpleElevationFilter
from vtkmodules.vtkFiltersExtraction import vtkExtractGeometry
from vtkmodules.vtkFiltersGeometry import vtkGeometryFilter
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()
# Test and compare vtkGeometryFilter verus
# vtkDataSetSurfaceFilter.
# Control test resolution
res = 10
# Create a synthetic source, then convert to unstructured grid
vol = vtkImageData()
vol.SetDimensions(res,res,res)
sphere = vtkSphere()
sphere.SetRadius(10000)
grid = vtkExtractGeometry()
grid.SetInputData(vol)
grid.SetImplicitFunction(sphere)
grid.Update()
print("Processing {0} hexes".format(grid.GetOutput().GetNumberOfCells()))
# Create a scalar field
ele = vtkSimpleElevationFilter()
ele.SetInputConnection(grid.GetOutputPort())
# Extract the surface with vtkGeometryFilter and time it. Indicate
# some faces to not not extract.
# the fast extraction mode.
face = [0,1,11,10]
faces = vtkCellArray()
faces.InsertNextCell(4,face)
excludedFaces = vtkPolyData()
excludedFaces.SetPolys(faces)
geomF = vtkGeometryFilter()
geomF.SetInputConnection(ele.GetOutputPort())
geomF.SetExcludedFacesData(excludedFaces)
# Show the result
mapper = vtkPolyDataMapper()
mapper.SetInputConnection(geomF.GetOutputPort())
mapper.SetScalarRange(0,float(res-1))
actor = vtkActor()
actor.SetMapper(mapper)
# Define graphics objects
ren1 = vtkRenderer()
ren1.SetBackground(0,0,0)
ren1.AddActor(actor)
ren1.GetActiveCamera().SetPosition(-1,-1,-1)
ren1.ResetCamera()
ren1.GetActiveCamera().Zoom(2)
renWin = vtkRenderWindow()
renWin.SetMultiSamples(0)
renWin.AddRenderer(ren1)
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
iren.Initialize()
iren.Start()
# --- end of script --
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