Function DrawTriangles

Common/DataModel/Testing/Cxx/UnitTestTriangleIntersection.cxx:33–106

namespace
{
void DrawTriangles(double* p1, double* q1, double* r1, double* p2, double* q2, double* r2)
{
  // Create a triangle
  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
  vtkIdType pid[6];
  pid[0] = points->InsertNextPoint(p1[0], p1[1], p1[2]);
  pid[1] = points->InsertNextPoint(q1[0], q1[1], q1[2]);
  pid[2] = points->InsertNextPoint(r1[0], r1[1], r1[2]);
  pid[3] = points->InsertNextPoint(p2[0], p2[1], p2[2]);
  pid[4] = points->InsertNextPoint(q2[0], q2[1], q2[2]);
  pid[5] = points->InsertNextPoint(r2[0], r2[1], r2[2]);

  vtkSmartPointer<vtkCellArray> verts = vtkSmartPointer<vtkCellArray>::New();
  for (int i = 0; i < 6; i++)
  {
    verts->InsertNextCell(1, &pid[i]);
  }

  vtkSmartPointer<vtkTriangle> triangle1 = vtkSmartPointer<vtkTriangle>::New();
  triangle1->GetPointIds()->SetId(0, 0);
  triangle1->GetPointIds()->SetId(1, 1);
  triangle1->GetPointIds()->SetId(2, 2);

  vtkSmartPointer<vtkTriangle> triangle2 = vtkSmartPointer<vtkTriangle>::New();
  triangle2->GetPointIds()->SetId(0, 3);
  triangle2->GetPointIds()->SetId(1, 4);
  triangle2->GetPointIds()->SetId(2, 5);

  vtkSmartPointer<vtkCellArray> triangles = vtkSmartPointer<vtkCellArray>::New();
  triangles->InsertNextCell(triangle1);
  triangles->InsertNextCell(triangle2);

  vtkSmartPointer<vtkDoubleArray> pointIds = vtkSmartPointer<vtkDoubleArray>::New();
  pointIds->SetNumberOfTuples(6);
  pointIds->SetTuple1(0, 0.);
  pointIds->SetTuple1(1, 1.);
  pointIds->SetTuple1(2, 2.);
  pointIds->SetTuple1(3, 3.);
  pointIds->SetTuple1(4, 4.);
  pointIds->SetTuple1(5, 5.);

  // Create a polydata object
  vtkSmartPointer<vtkPolyData> trianglePolyData = vtkSmartPointer<vtkPolyData>::New();

  // Add the geometry and topology to the polydata
  trianglePolyData->SetPoints(points);
  trianglePolyData->SetVerts(verts);
  trianglePolyData->SetPolys(triangles);
  trianglePolyData->GetPointData()->SetScalars(pointIds);

  // Create mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputData(trianglePolyData);
  mapper->SetScalarRange(0., 5.);
  vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetPointSize(5);