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package require vtk
package require vtkinteraction
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# create some points on a sphere such that the data is not in the form
# of z = f(x,y)
#
vtkMath math1
vtkPoints points
vtkFloatArray vectors
vectors SetNumberOfComponents 3
for {set i 0} {$i<100} {incr i 1} {
set theta [math1 Random 0.31415 2.8]
set phi [math1 Random 0.31415 2.8]
eval points InsertPoint $i [expr cos($theta)*sin($phi)] [expr sin($theta)*sin($phi)] [expr cos($phi)]
eval vectors InsertTuple3 $i [expr cos($theta)*sin($phi)] [expr sin($theta)*sin($phi)] [expr cos($phi)]
}
vtkPolyData profile
profile SetPoints points
[profile GetPointData] SetVectors vectors
# build a transform that rotates this data into z = f(x,y)
#
vtkTransform transform
transform RotateX 90
# triangulate the data using the specified transform
#
vtkDelaunay2D del1
del1 SetInput profile
del1 SetTransform transform
del1 BoundingTriangulationOff
del1 SetTolerance 0.001
del1 SetAlpha 0.0
vtkShrinkPolyData shrink
shrink SetInputConnection [del1 GetOutputPort]
vtkPolyDataMapper map
map SetInputConnection [shrink GetOutputPort]
vtkActor triangulation
triangulation SetMapper map
[triangulation GetProperty] SetColor 1 0 0
[triangulation GetProperty] BackfaceCullingOn
# Add the actors to the renderer, set the background and size
#
ren1 AddActor triangulation
ren1 SetBackground 1 1 1
renWin SetSize 300 300
renWin Render
set cam1 [ren1 GetActiveCamera]
$cam1 Zoom 1.5
$cam1 Azimuth 90
$cam1 Elevation 30
$cam1 Azimuth -60
# 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 .
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