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# This example demonstrates the conversion of point data to cell data.
# The conversion is necessary because we want to threshold data based
# on cell scalar values.
package require vtk
package require vtkinteraction
# Read some data with point data attributes. The data is from a plastic
# blow molding process (e.g., to make plastic bottles) and consists of two
# logical components: a mold and a parison. The parison is the
# hot plastic that is being molded, and the mold is clamped around the
# parison to form its shape.
vtkUnstructuredGridReader reader
reader SetFileName "$VTK_DATA_ROOT/Data/blow.vtk"
reader SetScalarsName "thickness9"
reader SetVectorsName "displacement9"
# Convert the point data to cell data. The point data is passed through the
# filter so it can be warped. The vtkThresholdFilter then thresholds based
# on cell scalar values and extracts a portion of the parison whose cell
# scalar values lie between 0.25 and 0.75.
vtkPointDataToCellData p2c
p2c SetInputConnection [reader GetOutputPort]
p2c PassPointDataOn
vtkWarpVector warp
warp SetInputConnection [p2c GetOutputPort]
vtkThreshold thresh
thresh SetInputConnection [warp GetOutputPort]
thresh ThresholdBetween 0.25 0.75
thresh SetInputArrayToProcess 1 0 0 0 "thickness9"
# thresh SetAttributeModeToUseCellData
# This is used to extract the mold from the parison.
vtkConnectivityFilter connect
connect SetInputConnection [thresh GetOutputPort]
connect SetExtractionModeToSpecifiedRegions
connect AddSpecifiedRegion 0
connect AddSpecifiedRegion 1
vtkDataSetMapper moldMapper
moldMapper SetInputConnection [reader GetOutputPort]
moldMapper ScalarVisibilityOff
vtkActor moldActor
moldActor SetMapper moldMapper
[moldActor GetProperty] SetColor .2 .2 .2
[moldActor GetProperty] SetRepresentationToWireframe
# The threshold filter has been used to extract the parison.
vtkConnectivityFilter connect2
connect2 SetInputConnection [thresh GetOutputPort]
vtkGeometryFilter parison
parison SetInputConnection [connect2 GetOutputPort]
vtkPolyDataNormals normals2
normals2 SetInputConnection [parison GetOutputPort]
normals2 SetFeatureAngle 60
vtkLookupTable lut
lut SetHueRange 0.0 0.66667
vtkPolyDataMapper parisonMapper
parisonMapper SetInputConnection [normals2 GetOutputPort]
parisonMapper SetLookupTable lut
parisonMapper SetScalarRange 0.12 1.0
vtkActor parisonActor
parisonActor SetMapper parisonMapper
# We generate some contour lines on the parison.
vtkContourFilter cf
cf SetInputConnection [connect2 GetOutputPort]
cf SetValue 0 .5
vtkPolyDataMapper contourMapper
contourMapper SetInputConnection [cf GetOutputPort]
vtkActor contours
contours SetMapper contourMapper
# Create graphics stuff
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Add the actors to the renderer, set the background and size
ren1 AddActor moldActor
ren1 AddActor parisonActor
ren1 AddActor contours
ren1 ResetCamera
[ren1 GetActiveCamera] Azimuth 60
[ren1 GetActiveCamera] Roll -90
[ren1 GetActiveCamera] Dolly 2
ren1 ResetCameraClippingRange
ren1 SetBackground 1 1 1
renWin SetSize 750 400
iren Initialize
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# prevent the tk window from showing up then start the event loop
wm withdraw .
iren Start
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