[vtkusers] Problem to visualize a scalar

[c fd]

Hello,
 
I'm a begginner in vtk!
I try to read a vtk file wich contains a structured grid and some data for each cell (I define it as a scalar). I try to read everything with vtkDataSetReader but only the grid appears in blue...???...
I would like to see the surface of each cell with a different color according to the value of the scalar...
I'll copy my code and an extract of the vtk file...If someone can help me, I'll appreciate...I'm blocked on this problem...Any help or suggestion is welcome!
Thank you!
 
Code:
 
 //read the .vtk file
    vtkDataSetReader *reader = vtkDataSetReader::New();
    reader->SetFileName("vtkdatas.vtk");
 reader->Update();
 
    // Set up a lookup table for coloring
    vtkLookupTable *lut = vtkLookupTable::New();
    lut->SetNumberOfColors(256);
    lut->SetHueRange(0.67,0.0);
    lut->Build();
 
 //convert data set from reader into graphics primitives
 vtkDataSetMapper *Mapper = vtkDataSetMapper::New();
    Mapper->SetInput(  (vtkDataSet *) reader->GetOutput());
 
 //actor
    vtkActor *Actor = vtkActor::New();
    Actor->SetMapper(Mapper);
    Actor->GetProperty()->SetRepresentationToWireframe();
 
 //convert data set from reader into graphics primitives
 vtkDataSetMapper *Mapper2 = vtkDataSetMapper::New();
    Mapper2->SetInput(  (vtkDataSet *) reader->GetOutput()); 
    Mapper2->ScalarVisibilityOn();
 
 //actor
    vtkActor *Actor2 = vtkActor::New();
    Actor2->SetMapper(Mapper2);
    Actor2->GetProperty()->SetRepresentationToWireframe();
 
    //renderer and render window
 vtkRenderer *ren = vtkRenderer::New();
 ren -> SetBackground(1, 1, 1);
 vtkRenderWindow *renWin = vtkRenderWindow::New();
 renWin -> SetSize( 400, 400 );
 renWin->AddRenderer( ren );
 ren->AddActor(Actor); 
 
 vtkRenderer *ren2 = vtkRenderer::New();
 ren2 -> SetBackground(0, 0, 0);
 vtkRenderWindow *renWin2 = vtkRenderWindow::New();
 renWin2 -> SetSize( 400, 400 );
 renWin2->AddRenderer( ren2 );
 ren2->AddActor(Actor2); 

 

VTK file:

 
# vtk DataFile Version 1.0
Grid datas
ASCII
 
DATASET STRUCTURED_GRID
DIMENSIONS         101         101           2
POINTS       20402 float
  0.0000000E+00  0.0000000E+00  0.0000000E+00
  7.5757573E-04  0.0000000E+00  0.0000000E+00
  1.5151515E-03  0.0000000E+00  0.0000000E+00
......
 
POINT_DATA       20402
SCALARS pressure float
LOOKUP_TABLE default
   101325.2    
   101325.2    
   101325.0    


		
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