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69 lines
1.7 KiB
69 lines
1.7 KiB
# This example shows how to use Delaunay3D with alpha shapes.
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#
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package require vtk
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package require vtkinteraction
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# The points to be triangulated are generated randomly in the unit cube
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# located at the origin. The points are then associated with a vtkPolyData.
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#
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vtkMath math
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vtkPoints points
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for {set i 0} {$i<25} {incr i 1} {
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eval points InsertPoint $i [math Random 0 1] [math Random 0 1] [math Random 0 1]
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}
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vtkPolyData profile
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profile SetPoints points
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# Delaunay3D is used to triangulate the points. The Tolerance is the distance
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# that nearly coincident points are merged together. (Delaunay does better if
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# points are well spaced.) The alpha value is the radius of circumcircles,
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# circumspheres. Any mesh entity whose circumcircle is smaller than this
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# value is output.
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#
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vtkDelaunay3D del
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del SetInput profile
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del SetTolerance 0.01
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del SetAlpha 0.2
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del BoundingTriangulationOff
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# Shrink the result to help see it better.
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vtkShrinkFilter shrink
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shrink SetInputConnection [del GetOutputPort]
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shrink SetShrinkFactor 0.9
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vtkDataSetMapper map
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map SetInputConnection [shrink GetOutputPort]
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vtkActor triangulation
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triangulation SetMapper map
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[triangulation GetProperty] SetColor 1 0 0
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# Create graphics stuff
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#
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vtkRenderer ren1
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vtkRenderWindow renWin
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renWin AddRenderer ren1
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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# Add the actors to the renderer, set the background and size
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#
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ren1 AddActor triangulation
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ren1 SetBackground 1 1 1
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renWin SetSize 250 250
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renWin Render
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set cam1 [ren1 GetActiveCamera]
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$cam1 Zoom 1.5
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# render the image
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#
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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renWin Render
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# prevent the tk window from showing up then start the event loop
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wm withdraw .
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