[vtkusers] WarpScalar - Problem about normal

[Cory Quammen]

Does your VTP file have point Normals? Can you share the file?

Thanks,
Cory

On Mon, Aug 31, 2015 at 5:30 AM, lilymo <lilymagic2005 at yahoo.com.hk> wrote:

> By referencing the example of WarpScalar (
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/WarpScalar
> <http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/WarpScalar>  ), I use a
> .vtp file instead of the sphere in the example, and I have edited some
> parts
> of it, mainly for the normal part.
>
> However, it seems that the point only offset towards the same normal, which
> results in a translation only.
>
> If I use vtkSphereSource, the following code can offset the points by its
> own normal, but not the same normal for all the points at the same time.
>
> What should I do? Thanks!
>
>
>
>
>
>
>
>
> #include <vtkActor.h>
> #include <vtkDoubleArray.h>
> #include <vtkPointData.h>
> #include <vtkPolyData.h>
> #include <vtkPolyDataMapper.h>
> #include <vtkRenderer.h>
> #include <vtkRenderWindow.h>
> #include <vtkRenderWindowInteractor.h>
> #include <vtkSmartPointer.h>
> #include <vtkSphereSource.h>
> #include <vtkWarpScalar.h>
> #include <vtkMath.h>
>
> #include <vtkXMLPolyDataReader.h>
>
> #include <vtkCylinderSource.h>
> #include <vtkUnsignedCharArray.h>
> #include <vtkTransform.h>
> #include <vtkTransformPolyDataFilter.h>
> #include <vtkProperty.h>
>
>
> int main(int, char *[])
> {
>         vtkSmartPointer<vtkXMLPolyDataReader> sphereSource =
>                 vtkSmartPointer<vtkXMLPolyDataReader>::New();
>         sphereSource->SetFileName("test.vtp");
>
>         // Create Scalars
>         vtkSmartPointer<vtkDoubleArray> scalars =
>                 vtkSmartPointer<vtkDoubleArray>::New();
>         int numberOfPoints =
> sphereSource->GetOutput()->GetNumberOfPoints();
>
>         sphereSource->GetOutput()->GetPointData()->SetScalars(scalars);
>
>         vtkSmartPointer<vtkWarpScalar> warpScalar =
>                 vtkSmartPointer<vtkWarpScalar>::New();
>         warpScalar->SetInputConnection(sphereSource->GetOutputPort());
>         warpScalar->SetScaleFactor(1); // use the scalars themselves
>
>         scalars->SetNumberOfTuples(numberOfPoints);
>
>
>         for(vtkIdType i = 0; i < numberOfPoints; ++i)
>         {
>                 scalars->SetTuple1(i,20);
>         }
>
>         //???
>         warpScalar->GetUseNormal();
>         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->SetInputConnection(sphereSource->GetOutputPort());
>
>         vtkSmartPointer<vtkActor> sactor =
>                 vtkSmartPointer<vtkActor>::New();
>                  sactor->GetProperty()->SetColor(1.0, 0.0, 1.0);
>         sactor->SetMapper(smapper);
>
>
> //--------------------------------------------------------------------
>         // Visualize
>         vtkSmartPointer<vtkRenderer> renderer =
>                 vtkSmartPointer<vtkRenderer>::New();
>         vtkSmartPointer<vtkRenderWindow> renderWindow =
>                 vtkSmartPointer<vtkRenderWindow>::New();
>         renderWindow->AddRenderer(renderer);
>         vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
>                 vtkSmartPointer<vtkRenderWindowInteractor>::New();
>         renderWindowInteractor->SetRenderWindow(renderWindow);
>
>         renderer->AddActor(actor);
>         renderer->AddActor(sactor);
>         renderer->SetBackground(1,1,1);
>
>         renderWindow->Render();
>         renderWindowInteractor->Start();
>
>         return EXIT_SUCCESS;
> }
>
>
>
> --
> View this message in context:
> http://vtk.1045678.n5.nabble.com/WarpScalar-Problem-about-normal-tp5733689.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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