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88 lines
2.5 KiB
88 lines
2.5 KiB
2 years ago
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# This example demonstrate the use of VTK data arrays as attribute
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# data as well as field data. It creates geometry (vtkPolyData) as
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# well as attribute data explicitly.
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package require vtk
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package require vtkinteraction
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# Create a float array which represents the points.
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vtkFloatArray pcoords
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# Note that by default, an array has 1 component.
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# We have to change it to 3 for points
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pcoords SetNumberOfComponents 3
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# We ask pcoords to allocate room for at least 4 tuples
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# and set the number of tuples to 4.
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pcoords SetNumberOfTuples 4
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# Assign each tuple. There are 5 specialized versions of SetTuple:
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# SetTuple1 SetTuple2 SetTuple3 SetTuple4 SetTuple9
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# These take 1, 2, 3, 4 and 9 components respectively.
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pcoords SetTuple3 0 0.0 0.0 0.0
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pcoords SetTuple3 1 0.0 1.0 0.0
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pcoords SetTuple3 2 1.0 0.0 0.0
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pcoords SetTuple3 3 1.0 1.0 0.0
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# Create vtkPoints and assign pcoords as the internal data array.
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vtkPoints points
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points SetData pcoords
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# Create the cells. In this case, a triangle strip with 2 triangles
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# (which can be represented by 4 points)
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vtkCellArray strips
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strips InsertNextCell 4
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strips InsertCellPoint 0
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strips InsertCellPoint 1
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strips InsertCellPoint 2
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strips InsertCellPoint 3
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# Create an integer array with 4 tuples. Note that when using
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# InsertNextValue (or InsertNextTuple1 which is equivalent in
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# this situation), the array will expand automatically
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vtkIntArray temperature
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temperature SetName "Temperature"
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temperature InsertNextValue 10
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temperature InsertNextValue 20
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temperature InsertNextValue 30
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temperature InsertNextValue 40
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# Create a double array.
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vtkDoubleArray vorticity
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vorticity SetName "Vorticity"
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vorticity InsertNextValue 2.7
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vorticity InsertNextValue 4.1
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vorticity InsertNextValue 5.3
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vorticity InsertNextValue 3.4
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# Create the dataset. In this case, we create a vtkPolyData
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vtkPolyData polydata
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# Assign points and cells
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polydata SetPoints points
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polydata SetStrips strips
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# Assign scalars
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[polydata GetPointData] SetScalars temperature
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# Add the vorticity array. In this example, this field
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# is not used.
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[polydata GetPointData] AddArray vorticity
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# Create the mapper and set the appropriate scalar range
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# (default is (0,1)
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vtkPolyDataMapper mapper
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mapper SetInput polydata
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mapper SetScalarRange 0 40
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# Create an actor.
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vtkActor actor
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actor SetMapper mapper
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# Create the rendering objects.
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vtkRenderer ren
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ren AddActor actor
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vtkRenderWindow renWin
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renWin AddRenderer ren
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vtkRenderWindowInteractor iren
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iren SetRenderWindow renWin
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iren AddObserver UserEvent {wm deiconify .vtkInteract}
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iren Initialize
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wm withdraw .
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