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93 lines
3.0 KiB
93 lines
3.0 KiB
#!/usr/bin/env python
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# This example demonstrates the use and manipulation of lookup tables.
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import vtk
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from vtk.util.colors import *
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from vtk.util.misc import vtkGetDataRoot
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VTK_DATA_ROOT = vtkGetDataRoot()
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# First create pipeline a simple pipeline that reads a structure grid
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# and then extracts a plane from the grid. The plane will be colored
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# differently by using different lookup tables.
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#
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# Note: the Update method is manually invoked because it causes the
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# reader to read; later on we use the output of the reader to set
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# a range for the scalar values.
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pl3d = vtk.vtkPLOT3DReader()
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pl3d.SetXYZFileName(VTK_DATA_ROOT + "/Data/combxyz.bin")
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pl3d.SetQFileName(VTK_DATA_ROOT + "/Data/combq.bin")
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pl3d.SetScalarFunctionNumber(100)
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pl3d.SetVectorFunctionNumber(202)
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pl3d.Update()
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plane = vtk.vtkStructuredGridGeometryFilter()
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plane.SetInputConnection(pl3d.GetOutputPort())
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plane.SetExtent(1, 100, 1, 100, 7, 7)
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lut = vtk.vtkLookupTable()
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planeMapper = vtk.vtkPolyDataMapper()
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planeMapper.SetLookupTable(lut)
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planeMapper.SetInputConnection(plane.GetOutputPort())
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planeMapper.SetScalarRange(pl3d.GetOutput().GetScalarRange())
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planeActor = vtk.vtkActor()
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planeActor.SetMapper(planeMapper)
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# This creates an outline around the data.
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outline = vtk.vtkStructuredGridOutlineFilter()
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outline.SetInputConnection(pl3d.GetOutputPort())
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outlineMapper = vtk.vtkPolyDataMapper()
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outlineMapper.SetInputConnection(outline.GetOutputPort())
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outlineActor = vtk.vtkActor()
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outlineActor.SetMapper(outlineMapper)
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# Much of the following is commented out. To try different lookup tables,
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# uncommented the appropriate portions.
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# This creates a black to white lut.
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##lut.SetHueRange(0, 0)
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##lut.SetSaturationRange(0, 0)
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##lut.SetValueRange(0.2, 1.0)
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# This creates a red to blue lut.
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##lut.SetHueRange(0.0, 0.667)
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# This creates a blue to red lut.
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##lut.SetHueRange(0.667, 0.0)
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# This creates a wierd effect. The Build() method causes the lookup
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# table to allocate memory and create a table based on the currect
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# hue, saturation, value, and alpha (transparency) range. Here we then
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# manually overwrite the values generated by the Build() method.
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lut.SetNumberOfColors(256)
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lut.Build()
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for i in range(0, 16):
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lut.SetTableValue(i*16, red[0], red[1], red[2], 1)
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lut.SetTableValue(i*16+1, green[0], green[1], green[2], 1)
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lut.SetTableValue(i*16+2, blue[0], blue[1], blue[2], 1)
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lut.SetTableValue(i*16+3, black[0], black[1], black[2], 1)
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# Create the RenderWindow, Renderer and both Actors
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ren = vtk.vtkRenderer()
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer(ren)
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iren = vtk.vtkRenderWindowInteractor()
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iren.SetRenderWindow(renWin)
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# Add the actors to the renderer, set the background and size
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ren.AddActor(outlineActor)
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ren.AddActor(planeActor)
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ren.SetBackground(0.1, 0.2, 0.4)
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ren.TwoSidedLightingOff()
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renWin.SetSize(250, 250)
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cam1 = ren.GetActiveCamera()
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cam1.SetClippingRange(3.95297, 50)
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cam1.SetFocalPoint(8.88908, 0.595038, 29.3342)
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cam1.SetPosition(-12.3332, 31.7479, 41.2387)
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cam1.SetViewUp(0.060772, -0.319905, 0.945498)
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iren.Initialize()
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renWin.Render()
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iren.Start()
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