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