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package require vtk
package require vtkinteraction
package require vtktesting
# This example demonstrates how to use the vtkPlaneWidget to probe
# a dataset and then generate contours on the probed data.
# Start by loading some data.
#
vtkMultiBlockPLOT3DReader pl3d
pl3d SetXYZFileName "$VTK_DATA_ROOT/Data/combxyz.bin"
pl3d SetQFileName "$VTK_DATA_ROOT/Data/combq.bin"
pl3d SetScalarFunctionNumber 100
pl3d SetVectorFunctionNumber 202
pl3d Update
set pl3dOutput [[pl3d GetOutput] GetBlock 0]
# The plane widget is used probe the dataset.
#
vtkPlaneWidget planeWidget
planeWidget SetInputData $pl3dOutput
planeWidget NormalToXAxisOn
planeWidget SetResolution 20
planeWidget SetRepresentationToOutline
planeWidget PlaceWidget
vtkPolyData plane
planeWidget GetPolyData plane
vtkProbeFilter probe
probe SetInputData plane
probe SetSourceData $pl3dOutput
vtkPolyDataMapper contourMapper
contourMapper SetInputConnection [probe GetOutputPort]
eval contourMapper SetScalarRange [$pl3dOutput GetScalarRange]
vtkActor contourActor
contourActor SetMapper contourMapper
contourActor VisibilityOff
# An outline is shown for context.
vtkStructuredGridOutlineFilter outline
outline SetInputData $pl3dOutput
vtkPolyDataMapper outlineMapper
outlineMapper SetInputConnection [outline GetOutputPort]
vtkActor outlineActor
outlineActor SetMapper outlineMapper
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Associate the line widget with the interactor
planeWidget SetInteractor iren
planeWidget AddObserver EnableEvent BeginInteraction
planeWidget AddObserver StartInteractionEvent BeginInteraction
planeWidget AddObserver InteractionEvent ProbeData
# Add the actors to the renderer, set the background and size
#
ren1 AddActor outlineActor
ren1 AddActor contourActor
ren1 SetBackground 1 1 1
renWin SetSize 300 300
ren1 SetBackground 0.1 0.2 0.4
set cam1 [ren1 GetActiveCamera]
$cam1 SetClippingRange 3.95297 50
$cam1 SetFocalPoint 9.71821 0.458166 29.3999
$cam1 SetPosition 2.7439 -37.3196 38.7167
$cam1 SetViewUp -0.16123 0.264271 0.950876
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
renWin Render
# Prevent the tk window from showing up then start the event loop.
wm withdraw .
# Actually generate contour lines.
proc BeginInteraction {} {
planeWidget GetPolyData plane
contourActor VisibilityOn
}
proc ProbeData {} {
planeWidget GetPolyData plane
}
iren Start
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