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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()
def GetRGBColor(colorName):
'''
Return the red, green and blue components for a
color as doubles.
'''
rgb = [0.0, 0.0, 0.0] # black
vtk.vtkNamedColors().GetColorRGB(colorName, rgb)
return rgb
# Create the RenderWindow, Renderer and both Actors
#
ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
lgt = vtk.vtkLight()
# create pipeline
#
locator = vtk.vtkMergePoints()
locator.SetDivisions(32, 32, 46)
locator.SetNumberOfPointsPerBucket(2)
locator.AutomaticOff()
v16 = vtk.vtkVolume16Reader()
v16.SetDataDimensions(64, 64)
v16.GetOutput().SetOrigin(0.0, 0.0, 0.0)
v16.SetDataByteOrderToLittleEndian()
v16.SetFilePrefix(VTK_DATA_ROOT + "/Data/headsq/quarter")
v16.SetImageRange(1, 93)
v16.SetDataSpacing(3.2, 3.2, 1.5)
iso = vtk.vtkMarchingCubes()
iso.SetInputConnection(v16.GetOutputPort())
iso.SetValue(0, 1150)
iso.ComputeGradientsOn()
iso.ComputeScalarsOff()
iso.SetLocator(locator)
gradient = vtk.vtkVectorNorm()
gradient.SetInputConnection(iso.GetOutputPort())
isoMapper = vtk.vtkDataSetMapper()
isoMapper.SetInputConnection(gradient.GetOutputPort())
isoMapper.ScalarVisibilityOn()
isoMapper.SetScalarRange(0, 1200)
isoMapper.ImmediateModeRenderingOn()
isoActor = vtk.vtkActor()
isoActor.SetMapper(isoMapper)
isoProp = isoActor.GetProperty()
isoProp.SetColor(GetRGBColor('antique_white'))
outline = vtk.vtkOutlineFilter()
outline.SetInputConnection(v16.GetOutputPort())
outlineMapper = vtk.vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())
outlineActor = vtk.vtkActor()
outlineActor.SetMapper(outlineMapper)
outlineProp = outlineActor.GetProperty()
# outlineProp.SetColor(0, 0, 0)
# Add the actors to the renderer, set the background and size
#
ren1.AddActor(outlineActor)
ren1.AddActor(isoActor)
ren1.SetBackground(1, 1, 1)
ren1.AddLight(lgt)
renWin.SetSize(250, 250)
ren1.SetBackground(0.1, 0.2, 0.4)
ren1.ResetCamera()
cam1 = ren1.GetActiveCamera()
cam1.Elevation(90)
cam1.SetViewUp(0, 0, -1)
cam1.Zoom(1.5)
lgt.SetPosition(cam1.GetPosition())
lgt.SetFocalPoint(cam1.GetFocalPoint())
ren1.ResetCameraClippingRange()
# render the image
#
renWin.Render()
#iren.Start()
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