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package require vtk
package require vtkinteraction
# cell scalars to point scalars
# get the interactor ui
# Create the RenderWindow, Renderer and RenderWindowInteractor
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# create a 2*2 cell/3*3 pt structuredgrid
vtkPoints points
points InsertNextPoint -1 1 0
points InsertNextPoint 0 1 0
points InsertNextPoint 1 1 0
points InsertNextPoint -1 0 0
points InsertNextPoint 0 0 0
points InsertNextPoint 1 0 0
points InsertNextPoint -1 -1 0
points InsertNextPoint 0 -1 0
points InsertNextPoint 1 -1 0
vtkFloatArray faceColors
faceColors InsertNextValue 0
faceColors InsertNextValue 1
faceColors InsertNextValue 1
faceColors InsertNextValue 2
vtkStructuredGrid sgrid
sgrid SetDimensions 3 3 1
sgrid SetPoints points
[sgrid GetCellData] SetScalars faceColors
vtkCellDataToPointData Cell2Point
Cell2Point SetInput sgrid
Cell2Point PassCellDataOn
vtkDataSetMapper mapper
mapper SetInput [Cell2Point GetStructuredGridOutput]
mapper SetScalarModeToUsePointData
mapper SetScalarRange 0 2
vtkActor actor
actor SetMapper mapper
# Add the actors to the renderer, set the background and size
ren1 AddActor actor
ren1 SetBackground 0.1 0.2 0.4
renWin SetSize 256 256
# render the image
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize
wm withdraw .
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