[vtkusers] tdinar at gmail.com

[Utkarsh Ayachit]

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;
> }
>
>
>
>
>
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