[vtkusers] Why can't I warp vtkCubeSource ?|

[Cory Quammen]

To fundamentally change the shape from a cube, you'll need to discretize
the cube to have more than just the 6 faces that define the initial cube.

First, triangulate the cube with vtkTriangleFilter, then use
vtkLinearSubdivisionFilter to add triangles. You should have better luck.

HTH,
Cory

On Fri, Oct 27, 2017 at 7:55 PM, alican <alican1812 at hotmail.com> wrote:

> I need  to apply kind of  "pinch" to vtkCubeSource, to make it look like
> half
> cylinder. I have thought to use warpScalar for that, however, no matter
> what
> I try I just can't get it working. The cube remains exactly as it was.
>
> Can anybody  spot a problem in my code? Thanks,
> AC
>
> void warpTest()
> {
>         vtkSmartPointer<vtkCubeSource> cubeSource =
> vtkSmartPointer<vtkCubeSource>::New();
>         cubeSource->SetXLength(50);
>         cubeSource->SetYLength(10);
>         cubeSource->SetZLength(1);
>         cubeSource->SetCenter(0,0,0);
>         cubeSource->Update();
>         vtkPolyData* polydata = cubeSource->GetOutput();
>
>         vtkSmartPointer<vtkDoubleArray> scalars =
> vtkSmartPointer<vtkDoubleArray>::New();
>         polydata->GetPointData()->SetScalars(scalars);
>         int numOfPoints = polydata->GetNumberOfPoints();
>         scalars->SetNumberOfTuples(numOfPoints);
>         for (vtkIdType i = 0; i < numOfPoints ; ++i)
>         {
>                 scalars->SetTuple1(i, 200);
>         }
>
>         vtkSmartPointer<vtkPolyDataNormals> normalGenerator =
> vtkSmartPointer<vtkPolyDataNormals>::New();
>         normalGenerator->SetInputData(polydata);
>         normalGenerator->ComputePointNormalsOn();
>         normalGenerator->ComputeCellNormalsOff();
>         normalGenerator->Update();
>
>         vtkSmartPointer<vtkWarpScalar> warpScalar =
> vtkSmartPointer<vtkWarpScalar>::New();
>         warpScalar->SetInputData(normalGenerator->GetOutput());
>         warpScalar->SetScaleFactor(1); // use the scalars themselves
>         warpScalar->Update();
>
>         vtkSmartPointer<vtkPolyDataMapper> mapper =
> vtkSmartPointer<vtkPolyDataMapper>::New();
>         mapper->SetInputConnection(warpScalar->GetOutputPort());
>
>         vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::
> New();
>         actor->GetProperty()->SetColor(1.0, 1.0, 0.0);
>         actor->SetMapper(mapper);
>
>         vtkSmartPointer<vtkPolyDataMapper> smapper =
> vtkSmartPointer<vtkPolyDataMapper>::New();
>         smapper->SetInputData(polydata);
>
>         vtkSmartPointer<vtkActor> sactor = vtkSmartPointer<vtkActor>::
> New();
>         sactor->GetProperty()->SetColor(1.0, 0.0, 1.0);
>         sactor->SetMapper(smapper);
>
>         // Visualize
>         getRenderer()->AddActor(actor);
>         getRenderer()->AddActor(sactor);
>
>
>
> --
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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