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60 lines
1.7 KiB
60 lines
1.7 KiB
#!/usr/bin/env python
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# This example shows how to use Delaunay3D with alpha shapes.
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import vtk
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# The points to be triangulated are generated randomly in the unit
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# cube located at the origin. The points are then associated with a
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# vtkPolyData.
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math = vtk.vtkMath()
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points = vtk.vtkPoints()
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for i in range(0, 25):
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points.InsertPoint(i, math.Random(0, 1), math.Random(0, 1),
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math.Random(0, 1))
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profile = vtk.vtkPolyData()
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profile.SetPoints(points)
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# Delaunay3D is used to triangulate the points. The Tolerance is the
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# distance that nearly coincident points are merged
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# together. (Delaunay does better if points are well spaced.) The
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# alpha value is the radius of circumcircles, circumspheres. Any mesh
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# entity whose circumcircle is smaller than this value is output.
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delny = vtk.vtkDelaunay3D()
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delny.SetInput(profile)
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delny.SetTolerance(0.01)
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delny.SetAlpha(0.2)
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delny.BoundingTriangulationOff()
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# Shrink the result to help see it better.
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shrink = vtk.vtkShrinkFilter()
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shrink.SetInputConnection(delny.GetOutputPort())
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shrink.SetShrinkFactor(0.9)
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map = vtk.vtkDataSetMapper()
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map.SetInputConnection(shrink.GetOutputPort())
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triangulation = vtk.vtkActor()
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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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ren = vtk.vtkRenderer()
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renWin = vtk.vtkRenderWindow()
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renWin.AddRenderer(ren)
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iren = vtk.vtkRenderWindowInteractor()
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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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ren.AddActor(triangulation)
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ren.SetBackground(1, 1, 1)
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renWin.SetSize(250, 250)
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renWin.Render()
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cam1 = ren.GetActiveCamera()
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cam1.Zoom(1.5)
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iren.Initialize()
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renWin.Render()
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iren.Start()
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