[vtkusers] Not getting to use the vtkThreshold with a vtkRectilinearGrid

[Adriano Gonçalves]

Hi, good afternoon for everybody!
I'm with a difficulty in using the vtkThreshold: I'm trying to kill, in 
a vtkRectilinearGrid, all the cells with value lower than a specific 
value. But, when I try to render the result, nothing appears. Can 
anybody give me a help? This is  my code:

         thresh = vtk.vtkThreshold()
         thresh.SetInput(vtk_grid.GetDataSet()) *# 
vtk_grid.GetDataSet()* returns me a vtkRectilinearGrid
         thresh.ThresholdByLower(0.5)* # The values of the cells are 
from 0 to 1*

         gridMapper = vtk.vtkDataSetMapper()
         gridMapper.SetInputConnection(thresh.GetOutputPort())

         gridActor = vtk.vtkActor()
         gridActor.SetMapper(gridMapper)

         ren1 = vtk.vtkRenderer()
         ren1.AddActor(gridActor)
         ren1.AddActor(gridActor)

         ren1.SetBackground(0, 0, 0)

         renWin = vtk.vtkRenderWindow()
         renWin.AddRenderer(ren1)
         renWin.SetSize(500, 500)

         iren = vtk.vtkRenderWindowInteractor()
         iren.SetRenderWindow(renWin)
         iren.Initialize()
         iren.Start()


Thank you so much!

-- 


Adriano


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