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# This example shows how to extract portions of an unstructured grid
# using vtkExtractUnstructuredGrid. vtkConnectivityFilter is also used
# to extract connected components.
#
# The data found here represents a blow molding process. Blow molding
# requires a mold and parison (hot, viscous plastic) which is shaped
# by the mold into the final form. The data file contains several steps
# in time for the analysis.
#
package require vtk
# Create a reader to read the unstructured grid data. We use a
# vtkDataSetReader which means the type of the output is unknown until
# the data file is read. SO we follow the reader with a vtkCastToConcrete
# and cast the output to vtkUnstructuredGrid.
vtkDataSetReader reader
reader SetFileName "$VTK_DATA_ROOT/Data/blow.vtk"
reader SetScalarsName "thickness9"
reader SetVectorsName "displacement9"
vtkCastToConcrete castToUnstructuredGrid
castToUnstructuredGrid SetInputConnection [reader GetOutputPort]
vtkWarpVector warp
warp SetInputConnection [castToUnstructuredGrid GetOutputPort]
# The connectivity filter extracts the first two regions. These are
# know to represent the mold.
vtkConnectivityFilter connect
connect SetInputConnection [warp 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
# Another connectivity filter is used to extract the parison.
vtkConnectivityFilter connect2
connect2 SetInputConnection [warp GetOutputPort]
connect2 SetExtractionModeToSpecifiedRegions
connect2 AddSpecifiedRegion 2
# We use vtkExtractUnstructuredGrid because we are interested in
# looking at just a few cells. We use cell clipping via cell id to
# extract the portion of the grid we are interested in.
vtkExtractUnstructuredGrid extractGrid
extractGrid SetInputConnection [connect2 GetOutputPort]
extractGrid CellClippingOn
extractGrid SetCellMinimum 0
extractGrid SetCellMaximum 23
vtkGeometryFilter parison
parison SetInputConnection [extractGrid 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
# 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 parisonActor
ren1 AddActor moldActor
ren1 SetBackground 1 1 1
ren1 ResetCamera
[ren1 GetActiveCamera] Azimuth 60
[ren1 GetActiveCamera] Roll -90
[ren1 GetActiveCamera] Dolly 2
ren1 ResetCameraClippingRange
renWin SetSize 500 375
iren Initialize
# prevent the tk window from showing up then start the event loop
wm withdraw .
iren Start
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