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79 lines
2.3 KiB
79 lines
2.3 KiB
# This example shows how to extract a piece of a dataset using an implicit
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# function. In this case the implicit function is formed by the boolean
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# combination of two ellipsoids.
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#
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package require vtk
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package require vtkinteraction
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# Here we create two ellipsoidal implicit functions and boolean them
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# together tto form a "cross" shaped implicit function.
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vtkQuadric quadric
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quadric SetCoefficients .5 1 .2 0 .1 0 0 .2 0 0
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vtkSampleFunction sample
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sample SetSampleDimensions 50 50 50
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sample SetImplicitFunction quadric
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sample ComputeNormalsOff
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vtkTransform trans
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trans Scale 1 .5 .333
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vtkSphere sphere
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sphere SetRadius 0.25
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sphere SetTransform trans
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vtkTransform trans2
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trans2 Scale .25 .5 1.0
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vtkSphere sphere2
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sphere2 SetRadius 0.25
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sphere2 SetTransform trans2
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vtkImplicitBoolean union
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union AddFunction sphere
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union AddFunction sphere2
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union SetOperationType 0;#union
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# Here is where it gets interesting. The implicit function is used to
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# extract those cells completely inside the function. They are then
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# shrunk to help show what was extracted.
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vtkExtractGeometry extract
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extract SetInputConnection [sample GetOutputPort]
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extract SetImplicitFunction union
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vtkShrinkFilter shrink
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shrink SetInputConnection [extract GetOutputPort]
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shrink SetShrinkFactor 0.5
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vtkDataSetMapper dataMapper
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dataMapper SetInputConnection [shrink GetOutputPort]
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vtkActor dataActor
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dataActor SetMapper dataMapper
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# The outline gives context to the original data.
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vtkOutlineFilter outline
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outline SetInputConnection [sample 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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set outlineProp [outlineActor GetProperty]
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eval $outlineProp SetColor 0 0 0
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# The usual rendering stuff is created.
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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 dataActor
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ren1 SetBackground 1 1 1
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renWin SetSize 500 500
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ren1 ResetCamera
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[ren1 GetActiveCamera] Zoom 1.5
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iren Initialize
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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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# prevent the tk window from showing up then start the event loop
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wm withdraw .
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