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95 lines
3.0 KiB
95 lines
3.0 KiB
2 years ago
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# This example demonstrates the use of glyphing. We also use a mask filter
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# to select a subset of points to glyph.
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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 a data file. This originally was a Cyberware laser digitizer scan
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# of Fran J.'s face. Surface normals are generated based on local geometry
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# (i.e., the polygon normals surrounding eash point are averaged). We flip
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# the normals because we want them to point out from Fran's face.
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#
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vtkPolyDataReader fran
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fran SetFileName "$VTK_DATA_ROOT/Data/fran_cut.vtk"
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vtkPolyDataNormals normals
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normals SetInputConnection [fran GetOutputPort]
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normals FlipNormalsOn
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vtkPolyDataMapper franMapper
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franMapper SetInputConnection [normals GetOutputPort]
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vtkActor franActor
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franActor SetMapper franMapper
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eval [franActor GetProperty] SetColor 1.0 0.49 0.25
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# We subsample the dataset because we want to glyph just a subset of
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# the points. Otherwise the display is cluttered and cannot be easily
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# read. The RandonModeOn and SetOnRatio combine to random select one out
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# of every 10 points in the dataset.
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#
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vtkMaskPoints ptMask
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ptMask SetInputConnection [normals GetOutputPort]
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ptMask SetOnRatio 10
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ptMask RandomModeOn
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# In this case we are using a cone as a glyph. We transform the cone so
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# its base is at 0,0,0. This is the point where glyph rotation occurs.
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vtkConeSource cone
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cone SetResolution 6
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vtkTransform transform
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transform Translate 0.5 0.0 0.0
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vtkTransformPolyDataFilter transformF
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transformF SetInputConnection [cone GetOutputPort]
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transformF SetTransform transform
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# vtkGlyph3D takes two inputs: the input point set (SetInputConnection)
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# which can be any vtkDataSet; and the glyph (SetSourceConnection) which
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# must be a vtkPolyData. We are interested in orienting the glyphs by the
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# surface normals that we previosuly generated.
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vtkGlyph3D glyph
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glyph SetInputConnection [ptMask GetOutputPort]
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glyph SetSourceConnection [transformF GetOutputPort]
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glyph SetVectorModeToUseNormal
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glyph SetScaleModeToScaleByVector
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glyph SetScaleFactor 0.004
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vtkPolyDataMapper spikeMapper
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spikeMapper SetInputConnection [glyph GetOutputPort]
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vtkActor spikeActor
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spikeActor SetMapper spikeMapper
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eval [spikeActor GetProperty] SetColor 0.0 0.79 0.34
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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 franActor
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ren1 AddActor spikeActor
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renWin SetSize 500 500
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ren1 SetBackground 0.1 0.2 0.4
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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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set cam1 [ren1 GetActiveCamera]
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$cam1 Zoom 1.4
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$cam1 Azimuth 110
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iren Initialize
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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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