[vtkusers] tdinar at gmail.com

[Tarig Dinar]

Thank you so much, it works now.


On Wed, Jul 22, 2015 at 12:41 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Can you try replacing the vtkGeometryFilter with vtkDataSetSurfaceFilter?
> I suspect the vtkGeometryFilter doesn't handle polyhedral elements.
>
> Utkarsh
>
> On Wed, Jul 22, 2015 at 1:13 AM tariq <tdinar at gmail.com> wrote:
>
>> Hi, I am a newbie to vtk, and I have been trying to visualize an
>> unstructured
>> grid with the aid of vtkGeometryFilter to convert a polyhedron
>> (unStructuredGrid) into vtkPolyData. Then compute the Normals and use a
>> Lookup table to plot the data. The one polyhedron in my code would not
>> show
>> up.  The code is pasted below and I am all ears. Thanks. TQ.
>>
>> #include <vtkSmartPointer.h>
>> #include <vtkRenderer.h>
>> #include <vtkUnstructuredGrid.h>
>> #include <vtkPolyhedron.h>
>> #include <vtkCellArray.h>
>> #include <vtkPointData.h>
>> #include <vtkCellData.h>
>> #include <vtkIdList.h>
>> #include <vtkPoints.h>
>> #include <vtkDataArray.h>
>> #include <vtkConnectivityFilter.h>
>> #include <vtkGeometryFilter.h>
>> #include <vtkPolyDataMapper.h>
>> #include <vtkPolyDataNormals.h>
>> #include <vtkActor.h>
>> #include <vtkRenderWindow.h>
>> #include <vtkRenderWindowInteractor.h>
>> #include <vtkLookupTable.h>
>>
>>
>>
>> int main( int, char*[] )
>> {
>>     // create polyhedron (cube)
>>     vtkIdType pointIds[8] = {0, 1, 2, 3, 4, 5, 6, 7};
>>
>>     vtkSmartPointer<vtkPoints> points =
>>     vtkSmartPointer<vtkPoints>::New();
>>     points->InsertNextPoint(-1.0,-1.0,-1.0);
>>     points->InsertNextPoint( 1.0,-1.0,-1.0);
>>     points->InsertNextPoint( 1.0, 1.0,-1.0);
>>     points->InsertNextPoint(-1.0, 1.0,-1.0);
>>     points->InsertNextPoint(-1.0,-1.0, 1.0);
>>     points->InsertNextPoint( 1.0,-1.0, 1.0);
>>     points->InsertNextPoint( 1.0, 1.0, 1.0);
>>     points->InsertNextPoint(-1.0, 1.0, 1.0);
>>
>>     vtkSmartPointer<vtkCellArray> faces =
>>     vtkSmartPointer<vtkCellArray>::New();
>>     vtkIdType face0[4] = {0, 3, 2, 1};
>>     vtkIdType face1[4] = {0, 4, 7, 3};
>>     vtkIdType face2[4] = {4, 5, 6, 7};
>>     vtkIdType face3[4] = {5, 1, 2, 6};
>>     vtkIdType face4[4] = {0, 1, 5, 4};
>>     vtkIdType face5[4] = {2, 3, 7, 6};
>>
>>     faces->InsertNextCell(4, face0);
>>     faces->InsertNextCell(4, face1);
>>     faces->InsertNextCell(4, face2);
>>     faces->InsertNextCell(4, face3);
>>     faces->InsertNextCell(4, face4);
>>     faces->InsertNextCell(4, face5);
>>
>>     vtkSmartPointer<vtkUnstructuredGrid> ugrid =
>>     vtkSmartPointer<vtkUnstructuredGrid>::New();
>>     ugrid->SetPoints(points);
>>     ugrid->InsertNextCell(
>>                           VTK_POLYHEDRON, 8, pointIds,
>>                           6, faces->GetPointer());
>>     // Extract poly data from unsturctured Grid
>>
>>     vtkSmartPointer<vtkConnectivityFilter> Filter1=
>>     vtkSmartPointer<vtkConnectivityFilter>::New();
>>
>>     Filter1->SetInputData(ugrid);
>>     Filter1->Update(0);
>>
>>     vtkSmartPointer<vtkGeometryFilter> Filter2=
>>     vtkSmartPointer<vtkGeometryFilter>::New();
>>
>>
>>     Filter2->SetInputConnection(0,Filter1->GetOutputPort(0));
>>     Filter2->Update(0);
>>
>>     // Calculate normals
>>
>>     vtkSmartPointer<vtkPolyDataNormals> normals =
>>     vtkSmartPointer<vtkPolyDataNormals>::New();
>>
>>     normals->SetFeatureAngle(60);
>>
>>     normals->SetInputConnection(0,Filter2->GetOutputPort(0));
>>
>>     normals->Update(0);
>>
>>     //Setup lookup table
>>     vtkSmartPointer<vtkLookupTable> lut=
>>     vtkSmartPointer<vtkLookupTable>::New();
>>
>>     lut->SetHueRange(0.0, 100);
>>
>>     // initiate mapper
>>
>>     vtkSmartPointer<vtkPolyDataMapper> mapper=
>>     vtkSmartPointer<vtkPolyDataMapper>::New();
>>
>>     mapper->SetInputConnection(0,normals->GetOutputPort(0));
>>     mapper->SetLookupTable(lut);
>>     mapper->SetScalarRange(0.12, 0.6);
>>
>>
>>     vtkSmartPointer<vtkActor> actor=
>>     vtkSmartPointer<vtkActor>::New();
>>
>>     // Initiate Actor
>>
>>     actor->SetMapper(mapper);
>>     actor->SetPosition(0.0, 0.0, 0.0);
>>
>>     // Create a renderer, render window, and interactor
>>     vtkSmartPointer<vtkRenderer> renderer =
>>     vtkSmartPointer<vtkRenderer>::New();
>>     renderer->ResetCamera();
>>     renderer->ResetCameraClippingRange();
>>
>>     vtkSmartPointer<vtkRenderWindow> renderWindow =
>>     vtkSmartPointer<vtkRenderWindow>::New();
>>
>>     renderWindow->AddRenderer(renderer);
>>
>>     vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
>>     vtkSmartPointer<vtkRenderWindowInteractor>::New();
>>     renderWindowInteractor->SetRenderWindow(renderWindow);
>>
>>     // Add the actor to the scene
>>     renderer->AddActor(actor);
>>     renderer->SetBackground(.2, .3, .4);
>>
>>     // Render and interact
>>     renderWindow->Render();
>>     renderWindowInteractor->Start();
>>
>>
>>
>>     return EXIT_SUCCESS;
>> }
>>
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://vtk.1045678.n5.nabble.com/tdinar-gmail-com-tp5733035.html
>> Sent from the VTK - Users mailing list archive at Nabble.com.
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