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65 lines
2.1 KiB
65 lines
2.1 KiB
#!/usr/bin/env python
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# This example shows how to generate and manipulate texture coordinates.
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# A random cloud of points is generated and then triangulated with
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# vtkDelaunay3D. Since these points do not have texture coordinates,
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# we generate them with vtkTextureMapToCylinder.
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import vtk
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from vtk.util.misc import vtkGetDataRoot
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VTK_DATA_ROOT = vtkGetDataRoot()
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# Begin by generating 25 random points in the unit sphere.
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sphere = vtk.vtkPointSource()
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sphere.SetNumberOfPoints(25)
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# Triangulate the points with vtkDelaunay3D. This generates a convex hull
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# of tetrahedron.
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delny = vtk.vtkDelaunay3D()
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delny.SetInputConnection(sphere.GetOutputPort())
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delny.SetTolerance(0.01)
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# The triangulation has texture coordinates generated so we can map
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# a texture onto it.
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tmapper = vtk.vtkTextureMapToCylinder()
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tmapper.SetInputConnection(delny.GetOutputPort())
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tmapper.PreventSeamOn()
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# We scale the texture coordinate to get some repeat patterns.
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xform = vtk.vtkTransformTextureCoords()
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xform.SetInputConnection(tmapper.GetOutputPort())
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xform.SetScale(4, 4, 1)
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# vtkDataSetMapper internally uses a vtkGeometryFilter to extract the
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# surface from the triangulation. The output (which is vtkPolyData) is
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# then passed to an internal vtkPolyDataMapper which does the
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# rendering.
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mapper = vtk.vtkDataSetMapper()
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mapper.SetInputConnection(xform.GetOutputPort())
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# A texture is loaded using an image reader. Textures are simply images.
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# The texture is eventually associated with an actor.
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bmpReader = vtk.vtkBMPReader()
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bmpReader.SetFileName(VTK_DATA_ROOT + "/Data/masonry.bmp")
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atext = vtk.vtkTexture()
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atext.SetInputConnection(bmpReader.GetOutputPort())
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atext.InterpolateOn()
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triangulation = vtk.vtkActor()
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triangulation.SetMapper(mapper)
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triangulation.SetTexture(atext)
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# Create the standard rendering 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(300, 300)
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iren.Initialize()
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renWin.Render()
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iren.Start()
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