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package require vtk
package require vtkinteraction
# Example demonstrates how to generate a 3D tetrahedra mesh from a
# volume. This example differs from the previous clipVolume.tcl examples
# in that it uses the slower ordered triangulator and generates clip scalars.
# Quadric definition
vtkQuadric quadric
quadric SetCoefficients .5 1 .2 0 .1 0 0 .2 0 0
vtkSampleFunction sample
sample SetSampleDimensions 20 20 20
sample SetImplicitFunction quadric
sample ComputeNormalsOff
sample Update
# Program a bandpass filter to clip a range of data. What we do is transform the
# scalars so that values laying betweeen (minRange,maxRange) are >= 0.0; all
# others are < 0.0,
vtkImplicitDataSet dataset
dataset SetDataSet [sample GetOutput]
vtkImplicitWindowFunction window
window SetImplicitFunction dataset
window SetWindowRange 0.5 1.0
# Generate tetrahedral mesh
vtkClipVolume clip
clip SetInputConnection [sample GetOutputPort]
clip SetClipFunction window
clip SetValue 0.0
clip GenerateClippedOutputOff
clip Mixed3DCellGenerationOff
vtkGeometryFilter gf
# gf SetInput [clip GetClippedOutput]
gf SetInputConnection [clip GetOutputPort]
vtkPolyDataMapper clipMapper
clipMapper SetInputConnection [gf GetOutputPort]
clipMapper ScalarVisibilityOn
eval clipMapper SetScalarRange 0 2
vtkActor clipActor
clipActor SetMapper clipMapper
[clipActor GetProperty] SetColor .8 .4 .4
# Create outline
vtkOutlineFilter outline
# outline SetInputData [clip GetInput]
outline SetInputConnection [sample GetOutputPort]
vtkPolyDataMapper outlineMapper
outlineMapper SetInputConnection [outline GetOutputPort]
vtkActor outlineActor
outlineActor SetMapper outlineMapper
eval [outlineActor GetProperty] SetColor 0 0 0
# Define graphics objects
vtkRenderer ren1
vtkRenderWindow renWin
renWin SetMultiSamples 0
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
ren1 SetBackground 1 1 1
ren1 AddActor clipActor
ren1 AddActor outlineActor
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize
wm withdraw .
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