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# This example shows how to use Delaunay3D with alpha shapes.
#
package require vtk
package require vtkinteraction
# The points to be triangulated are generated randomly in the unit cube
# located at the origin. The points are then associated with a vtkPolyData.
#
vtkMath math
vtkPoints points
for {set i 0} {$i<25} {incr i 1} {
eval points InsertPoint $i [math Random 0 1] [math Random 0 1] [math Random 0 1]
}
vtkPolyData profile
profile SetPoints points
# Delaunay3D is used to triangulate the points. The Tolerance is the distance
# that nearly coincident points are merged together. (Delaunay does better if
# points are well spaced.) The alpha value is the radius of circumcircles,
# circumspheres. Any mesh entity whose circumcircle is smaller than this
# value is output.
#
vtkDelaunay3D del
del SetInput profile
del SetTolerance 0.01
del SetAlpha 0.2
del BoundingTriangulationOff
# Shrink the result to help see it better.
vtkShrinkFilter shrink
shrink SetInputConnection [del GetOutputPort]
shrink SetShrinkFactor 0.9
vtkDataSetMapper map
map SetInputConnection [shrink GetOutputPort]
vtkActor triangulation
triangulation SetMapper map
[triangulation GetProperty] SetColor 1 0 0
# Create 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 triangulation
ren1 SetBackground 1 1 1
renWin SetSize 250 250
renWin Render
set cam1 [ren1 GetActiveCamera]
$cam1 Zoom 1.5
# 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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