[vtkusers] Extract Normals

[Bill Lorensen]

After
reader1->SetFileName ( inputFilename.c_str() );
try
reader1->Update();

On Tue, Oct 18, 2011 at 10:40 AM, andon <antoniod987 at gmail.com> wrote:

> Well, the code is quite standard:
>
> -
> -
> -
>  std::string inputFilename = "../data/bunny.ply";
>
>   vtkSmartPointer<vtkPLYReader> reader1 =
>    vtkSmartPointer<vtkPLYReader>::New();
>  reader1->SetFileName ( inputFilename.c_str() );
>
>  // Visualize
>  vtkSmartPointer<vtkPolyDataMapper> mapper1 =
>    vtkSmartPointer<vtkPolyDataMapper>::New();
>  mapper1->SetInputConnection(reader1->GetOutputPort());
>
>  vtkSmartPointer<vtkPolyData> polydata =
> vtkSmartPointer<vtkPolyData>::New();
>    polydata->DeepCopy(reader1->GetOutput());
>
> vtkDoubleArray* normalDataDouble =
>
> vtkDoubleArray::SafeDownCast(polydata->GetPointData()->GetArray("Normals"));
>
>  vtkSmartPointer<vtkActor> actor1 =
>    vtkSmartPointer<vtkActor>::New();
>  actor1->SetMapper(mapper1);
>  //bunny2
>   std::string inputFilename2 = "../data/bunny.ply";
>
>  vtkSmartPointer<vtkPLYReader> reader2 =
>    vtkSmartPointer<vtkPLYReader>::New();
>  reader2->SetFileName ( inputFilename2.c_str() );
>
>  // Visualize
>  vtkSmartPointer<vtkPolyDataMapper> mapper2 =
>    vtkSmartPointer<vtkPolyDataMapper>::New();
>  mapper2->SetInputConnection(reader2->GetOutputPort());
>
>  vtkSmartPointer<vtkActor> actor2 =
>    vtkSmartPointer<vtkActor>::New();
>  actor2->SetMapper(mapper2);
>
>  // A renderer and render window
>  vtkSmartPointer<vtkRenderer> renderer =
>    vtkSmartPointer<vtkRenderer>::New();
>  vtkSmartPointer<vtkRenderWindow> renderWindow =
>    vtkSmartPointer<vtkRenderWindow>::New();
>  renderWindow->AddRenderer(renderer);
>
>
>
>   // An interactor
>  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
>    vtkSmartPointer<vtkRenderWindowInteractor>::New();
>
>  renderWindowInteractor->SetRenderWindow(renderWindow);
>  actor1->SetPosition(1,0,0);
>  actor2->SetPosition(1.2,0,0);
>  renderer->AddActor(actor1);
>  renderer->AddActor(actor2);
>  renderer->SetBackground(1,1,1);
>
>  vtkSmartPointer<vtkInteractorStyleSwitch> style =
> vtkSmartPointer<vtkInteractorStyleSwitch>::New();
>  renderWindowInteractor->SetInteractorStyle(style);
> -
> -
> -
> The rest of the code is not necessary....I'm trying than I'm using some ply
> files from here: http://graphics.im.ntu.edu.tw/~robin/courses/cg03/model/
>
> and i need to extract normals from the actor that i create from the ply
> file, in particular in relation with some cells (that i will pick from
> cellpicker) , because i have to make some consideration about cells
> orientation.....can you help me??? i try to use "polydata" for extract
> normals but the array normalsDataDouble that i obtain is not
> initialized...if i try to use this array i throw in an exception....
>
> --
> View this message in context:
> http://vtk.1045678.n5.nabble.com/Extract-Normals-tp4905504p4913930.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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