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77 lines
2.4 KiB
77 lines
2.4 KiB
# This example demonstrates the subsampling of a structured grid.
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#
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# First we include the VTK Tcl packages which will make available
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# all of the vtk commands from Tcl. The vtkinteraction package defines
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# a simple Tcl/Tk interactor widget.
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#
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package require vtk
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package require vtkinteraction
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# Read some structured data.
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#
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vtkPLOT3DReader pl3d
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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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# Here we subsample the grid. The SetVOI method requires six values
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# specifying (imin,imax, jmin,jmax, kmin,kmax) extents. In this example
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# we extracting a plane. Note that the VOI is clamped to zero (min) and
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# the maximum i-j-k value; that way we can use the -1000,1000 specification
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# and be sure the values are clamped. The SampleRate specifies that we take
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# every point in the i-direction; every other point in the j-direction; and
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# every third point in the k-direction. IncludeBoundaryOn makes sure that we
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# get the boundary points even if the SampleRate does not coincident with
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# the boundary.
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#
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vtkExtractGrid extract
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extract SetInputConnection [pl3d GetOutputPort]
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extract SetVOI 30 30 -1000 1000 -1000 1000
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extract SetSampleRate 1 2 3
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extract IncludeBoundaryOn
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vtkDataSetMapper mapper
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mapper SetInputConnection [extract GetOutputPort]
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mapper SetScalarRange .18 .7
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vtkActor actor
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actor SetMapper mapper
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vtkStructuredGridOutlineFilter outline
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outline SetInputConnection [pl3d GetOutputPort]
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vtkPolyDataMapper outlineMapper
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outlineMapper SetInputConnection [outline GetOutputPort]
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vtkActor outlineActor
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outlineActor SetMapper outlineMapper
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[outlineActor GetProperty] SetColor 0 0 0
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# Add the usual rendering stuff.
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#
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vtkRenderer ren1
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vtkRenderWindow renWin
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renWin AddRenderer ren1
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vtkRenderWindowInteractor iren
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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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#
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ren1 AddActor outlineActor
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ren1 AddActor actor
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ren1 SetBackground 1 1 1
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renWin SetSize 300 180
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set cam1 [ren1 GetActiveCamera]
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$cam1 SetClippingRange 2.64586 47.905
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$cam1 SetFocalPoint 8.931 0.358127 31.3526
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$cam1 SetPosition 29.7111 -0.688615 37.1495
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$cam1 SetViewUp -0.268328 0.00801595 0.963294
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# render the image
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#
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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renWin Render
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# prevent the tk window from showing up then start the event loop
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wm withdraw .
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