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# This example demonstrates the use of the contour filter, and the use of
# the vtkSampleFunction to generate a volume of data samples from an
# implicit function.
#
# First we include the VTK Tcl packages which will make available
# all of the vtk commands from Tcl. The vtkinteraction package defines
# a simple Tcl/Tk interactor widget.
#
package require vtk
package require vtkinteraction
# VTK supports implicit functions of the form f(x,y,z)=constant. These
# functions can represent things spheres, cones, etc. Here we use a
# general form for a quadric to create an elliptical data field.
vtkQuadric quadric
quadric SetCoefficients .5 1 .2 0 .1 0 0 .2 0 0
# vtkSampleFunction samples an implicit function over the x-y-z range
# specified (here it defaults to -1,1 in the x,y,z directions).
vtkSampleFunction sample
sample SetSampleDimensions 30 30 30
sample SetImplicitFunction quadric
# Create five surfaces F(x,y,z) = constant between range specified. The
# GenerateValues() method creates n isocontour values between the range
# specified.
vtkContourFilter contours
contours SetInputConnection [sample GetOutputPort]
contours GenerateValues 5 0.0 1.2
vtkPolyDataMapper contMapper
contMapper SetInputConnection [contours GetOutputPort]
contMapper SetScalarRange 0.0 1.2
vtkActor contActor
contActor SetMapper contMapper
# We'll put a simple outline around the data.
vtkOutlineFilter outline
outline SetInputConnection [sample GetOutputPort]
vtkPolyDataMapper outlineMapper
outlineMapper SetInputConnection [outline GetOutputPort]
vtkActor outlineActor
outlineActor SetMapper outlineMapper
eval [outlineActor GetProperty] SetColor 0 0 0
# The usual rendering stuff.
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
ren1 SetBackground 1 1 1
ren1 AddActor contActor
ren1 AddActor outlineActor
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize
wm withdraw .
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