[vtkusers] using vtkPolyhedron and clipping.

[Billy Araujo]

I am trying to display to create and display a polyhedron and a clipped
polyhedron by a plane. Does anyone know of a simple example?

Also, I don't understand why I have to add the vtkPolyhedron to
a vtkUnstructuredGrid to display the polyhedron.

Is this the best way to display a polyhedron?

  // Geometry

  VTK_CREATE(vtkPoints, points);
  points->InsertNextPoint(0.0, 0.0, 0.0);
  points->InsertNextPoint(1.0, 0.0, 0.0);
  points->InsertNextPoint(1.0, 1.0, 0.0);
  points->InsertNextPoint(0.0, 1.0, 0.0);
  points->InsertNextPoint(0.0, 0.0, 1.0);
  points->InsertNextPoint(1.0, 0.0, 1.0);
  points->InsertNextPoint(1.0, 1.0, 1.0);
  points->InsertNextPoint(0.0, 1.0, 1.0);

  /*
  VTK_CREATE(vtkPolyhedron, polyhedron);
  polyhedron->GetPointIds()->SetNumberOfIds(8);
  polyhedron->GetPointIds()->SetId(0,0);
  polyhedron->GetPointIds()->SetId(1,1);
  polyhedron->GetPointIds()->SetId(2,2);
  polyhedron->GetPointIds()->SetId(3,3);
  polyhedron->GetPointIds()->SetId(4,4);
  polyhedron->GetPointIds()->SetId(5,5);
  polyhedron->GetPointIds()->SetId(6,6);
  polyhedron->GetPointIds()->SetId(7,7);
  */

  vtkIdType polyhedronPointsIds[8] = {0, 1, 2, 3, 4, 5, 6, 7};

  vtkIdType polyhedronFace[6][4] = {{0, 3, 2, 1}, {4, 5, 6, 7},
{1, 2, 6, 5}, {0, 4, 7, 3},
        {0, 1, 5, 4}, {2, 3, 7, 6}};

  VTK_CREATE(vtkCellArray, polyhedronFaces);
  for (int i = 0; i < 6; i++)
  {
    polyhedronFaces->InsertNextCell(4, polyhedronFace[i]);
  }

  VTK_CREATE(vtkUnstructuredGrid, uGrid);
  uGrid->SetPoints(points);
  uGrid->InsertNextCell(VTK_POLYHEDRON, 8, polyhedronPointsIds, 6,
polyhedronFaces->GetPointer());
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