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# This example demonstrates the use of vtkCardinalSpline.
# It creates random points and connects them with a spline
#
# First we include the VTK Tcl packages which will make available
# all of the vtk commands to Tcl
#
package require vtk
package require vtkinteraction
package require vtktesting
# This will be used later to get random numbers.
vtkMath math
# Total number of points.
set numberOfInputPoints 10
# One spline for each direction.
vtkCardinalSpline aSplineX
vtkCardinalSpline aSplineY
vtkCardinalSpline aSplineZ
# Generate random (pivot) points and add the corresponding
# coordinates to the splines.
# aSplineX will interpolate the x values of the points
# aSplineY will interpolate the y values of the points
# aSplineZ will interpolate the z values of the points
vtkPoints inputPoints
for {set i 0} {$i < $numberOfInputPoints} {incr i 1} {
set x [math Random 0 1]
set y [math Random 0 1]
set z [math Random 0 1]
aSplineX AddPoint $i $x
aSplineY AddPoint $i $y
aSplineZ AddPoint $i $z
inputPoints InsertPoint $i $x $y $z
}
# The following section will create glyphs for the pivot points
# in order to make the effect of the spline more clear.
# Create a polydata to be glyphed.
vtkPolyData inputData
inputData SetPoints inputPoints
# Use sphere as glyph source.
vtkSphereSource balls
balls SetRadius .01
balls SetPhiResolution 10
balls SetThetaResolution 10
vtkGlyph3D glyphPoints
glyphPoints SetInputData inputData
glyphPoints SetSourceConnection [balls GetOutputPort]
vtkPolyDataMapper glyphMapper
glyphMapper SetInputConnection [glyphPoints GetOutputPort]
vtkActor glyph
glyph SetMapper glyphMapper
eval [glyph GetProperty] SetDiffuseColor $tomato
[glyph GetProperty] SetSpecular .3
[glyph GetProperty] SetSpecularPower 30
# Generate the polyline for the spline.
vtkPoints points
vtkPolyData profileData
# Number of points on the spline
set numberOfOutputPoints 400
# Interpolate x, y and z by using the three spline filters and
# create new points
for {set i 0} {$i< $numberOfOutputPoints} {incr i 1} {
set t [expr ( $numberOfInputPoints - 1.0 ) / ( $numberOfOutputPoints - 1.0 ) * $i]
points InsertPoint $i [aSplineX Evaluate $t] [aSplineY Evaluate $t] [aSplineZ Evaluate $t]
}
# Create the polyline.
vtkCellArray lines
lines InsertNextCell $numberOfOutputPoints
for {set i 0} {$i < $numberOfOutputPoints} {incr i 1} {
lines InsertCellPoint $i
}
profileData SetPoints points
profileData SetLines lines
# Add thickness to the resulting line.
vtkTubeFilter profileTubes
profileTubes SetNumberOfSides 8
profileTubes SetInputData profileData
profileTubes SetRadius .005
vtkPolyDataMapper profileMapper
profileMapper SetInputConnection [profileTubes GetOutputPort]
vtkActor profile
profile SetMapper profileMapper
eval [profile GetProperty] SetDiffuseColor $banana
[profile GetProperty] SetSpecular .3
[profile GetProperty] SetSpecularPower 30
# Now create the RenderWindow, Renderer and Interactor
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Add the actors
ren1 AddActor glyph
ren1 AddActor profile
renWin SetSize 500 500
# render the image
#
iren Initialize
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# prevent the tk window from showing up
wm withdraw .
iren Start
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