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94 lines
2.7 KiB
94 lines
2.7 KiB
2 years ago
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# This example demonstrates the generation of a streamsurface.
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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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package require vtktesting
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# Read the data and specify which scalars and vectors to read.
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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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# We use a rake to generate a series of streamline starting points
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# scattered along a line. Each point will generate a streamline. These
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# streamlines are then fed to the vtkRuledSurfaceFilter which stitches
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# the lines together to form a surface.
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#
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vtkLineSource rake
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rake SetPoint1 15 -5 32
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rake SetPoint2 15 5 32
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rake SetResolution 21
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vtkPolyDataMapper rakeMapper
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rakeMapper SetInputConnection [rake GetOutputPort]
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vtkActor rakeActor
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rakeActor SetMapper rakeMapper
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vtkRungeKutta4 integ
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vtkStreamTracer sl
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sl SetInputConnection [pl3d GetOutputPort]
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sl SetSourceConnection [rake GetOutputPort]
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sl SetIntegrator integ
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sl SetMaximumPropagation 0.1
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sl SetMaximumPropagationUnitToTimeUnit
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sl SetInitialIntegrationStep 0.1
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sl SetInitialIntegrationStepUnitToCellLengthUnit
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sl SetIntegrationDirectionToBackward
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#
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# The ruled surface stiches together lines with triangle strips.
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# Note the SetOnRatio method. It turns on every other strip that
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# the filter generates (only when multiple lines are input).
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#
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vtkRuledSurfaceFilter scalarSurface
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scalarSurface SetInputConnection [sl GetOutputPort]
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scalarSurface SetOffset 0
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scalarSurface SetOnRatio 2
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scalarSurface PassLinesOn
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scalarSurface SetRuledModeToPointWalk
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scalarSurface SetDistanceFactor 30
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vtkPolyDataMapper mapper
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mapper SetInputConnection [scalarSurface GetOutputPort]
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eval mapper SetScalarRange [[pl3d GetOutput] GetScalarRange]
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vtkActor actor
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actor SetMapper mapper
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# Put an outline around for context.
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#
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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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# Now create the usual graphics stuff.
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vtkRenderer ren
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vtkRenderWindow renWin
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renWin AddRenderer ren
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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ren AddActor rakeActor
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ren AddActor actor
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ren AddActor outlineActor
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ren SetBackground 1 1 1
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renWin SetSize 300 300
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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iren Initialize
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# interact with data
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wm withdraw .
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