[vtkusers] Actor color gradient

[joaoroberto88]

Hello, 

I've posted this topic in VTK Users list, but I think this one is more
active from the first (sorry for the duplicity of subjects). Here is my
problem:
I would like to apply a color gradient on a vtkActor. I've defined scalar
values to each vtkCell (by following this example
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ColorCellsWithRGB).
However, the color transition isn't as I want. Please take a look in the
attached screenshot. Also below is a piece of code responsible for rendering
the image. What can I do to have it done? 

Thanks, 

Joao. 

// Mesh rendering 
vtkSmartPointer<vtkPolyData> gridPolyData = mesh->getGrid(); 
vtkSmartPointer<vtkPolyDataMapper> gridMapper =
vtkSmartPointer<vtkPolyDataMapper>::New(); 
// gridMapper->InterpolateScalarsBeforeMappingOff(); // Didn't take effect
on color gradient 
gridMapper->SetInputData(gridPolyData); 

vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); 
actor->SetMapper(gridMapper); 
//    actor->GetProperty()->SetColor(1, 1, 1); 
actor->GetProperty()->EdgeVisibilityOff(); 

renderer = vtkSmartPointer<vtkRenderer>::New(); 
renderer->SetBackground(1, 1, 1); // White 
renderer->AddActor(actor); 

renderWindow->AddRenderer(renderer); 

// QVTKWidget class method 
this->SetRenderWindow(renderWindow); 
renderWindow->Render();

<http://vtk.1045678.n5.nabble.com/file/n5732273/Screen_Shot_2015-06-09_at_10.png> 



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