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105 lines
3.2 KiB
105 lines
3.2 KiB
# This example demonstrates the use and manipulation of lookup tables.
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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. The vtktesting package includes a
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# predefined set of colors.
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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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# 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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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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vtkStructuredGridGeometryFilter plane
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plane SetInputConnection [pl3d GetOutputPort]
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plane SetExtent 1 100 1 100 7 7
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vtkLookupTable lut
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vtkPolyDataMapper planeMapper
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planeMapper SetLookupTable lut
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planeMapper SetInputConnection [plane GetOutputPort]
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eval planeMapper SetScalarRange [[pl3d GetOutput] GetScalarRange]
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vtkActor planeActor
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planeActor SetMapper planeMapper
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# This creates an outline around the data.
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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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# Much of the following is commented out. To try different lookup tables,
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# uncommented the appropriate portions.
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#
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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 table
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# to allocate memory and create a table based on the currect hue, saturation,
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# value, and alpha (transparency) range. Here we then manually overwrite the
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# values generated by the Build() method.
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lut SetNumberOfColors 256
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lut Build
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for {set i 0} {$i<16} {incr i 1} {
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eval lut SetTableValue [expr $i*16] $red 1
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eval lut SetTableValue [expr $i*16+1] $green 1
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eval lut SetTableValue [expr $i*16+2] $blue 1
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eval lut SetTableValue [expr $i*16+3] $black 1
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}
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# Create the RenderWindow, Renderer and both Actors
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#
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vtkRenderer ren1
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vtkRenderWindow renWin
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renWin AddRenderer ren1
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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# Add the actors to the renderer, set the background and size
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#
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ren1 AddActor outlineActor
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ren1 AddActor planeActor
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ren1 SetBackground 0.1 0.2 0.4
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ren1 TwoSidedLightingOff
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renWin SetSize 250 250
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iren Initialize
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set cam1 [ren1 GetActiveCamera]
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$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 AddObserver UserEvent {wm deiconify .vtkInteract}
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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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