使用点拓扑结构
调用函数SetVerts将vtkCellArray按照离散点拓扑结构处理；
调用vtkPointSet类提供的SetPoints函数，设置几何数据点的坐标；
void vtkPolyData::SetVerts(vtkCellArray* v);
virtual void vtkPointSet::SetPoints(vtkPoints*);
float x[8][3] =
{
{
0,0,0},{
1,0,0},{
1,1,0},{
0,1,0},
{
0,0,1},{
1,0,1},{
1,1,1},{
0,1,1}
};
vtkNew<vtkPolyData> geometry;
vtkNew<vtkPoints> points;
vtkNew<vtkCellArray> polys;
polys->InsertNextCell(8);
for (size_t i = 0; i < 8; i++)
{
points->InsertPoint(i, x[i]);
polys->InsertCellPoint(i);
}
geometry->SetPoints(points);
geometry->SetVerts(polys);
vtkNew<vtkPolyDataMapper> geometryMapper;
geometryMapper->SetInputData(geometry);
vtkNew<vtkActor> geometryActor;
geometryActor->SetMapper(geometryMapper);
vtkNew<vtkRenderer> renderer;
renderer->AddActor(geometryActor);
renderer->ResetCamera();
renderer->SetBackground(0, 0, 0);
vtkNew<vtkRenderWindow> renWin;
renWin->AddRenderer(renderer);
renWin->SetSize(300, 300);
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetRenderWindow(renWin);
renWin->Render();
iren->Start();
通过InsertNextCell(int)指定点的个数count，然后使用InsertCellPoint()方法一次添加一个点来创建单元。如果最初不知道计数，使用UpdateCellCount()方法更新单元个数，返回单元的单元id。
使用线拓扑结构
调用函数SetLines将vtkCellArray按照线拓扑结构处理；
调用vtkPointSet类提供的SetPoints函数，设置几何数据点的坐标；
geometry->SetPoints(points);
geometry->SetLines(polys);
使用面拓扑结构
vtkNew<vtkCellArray> polys;
for (size_t i = 0; i < 6; i++)
{
polys->InsertNextCell(4, pts[i]);
}
geometry->SetPoints(points);
geometry->SetPolys(polys);
使用InsertNextCell(4, pts[i])设置vtkCellArray的多边形单元，使用vtkPolyData的方法SetPolys设置多边形单元的拓扑结构；
float x[8][3] =
{
{
0,0,0},{
1,0,0},{
1,1,0},{
0,1,0},
{
0,0,1},{
1,0,1},{
1,1,1},{
0,1,1}
};
vtkIdType pts[6][4] =
{
{
0,1,2,3},{
4,5,6,7},{
0,1,5,4},
{
1,2,6,5},{
2,3,7,6},{
3,0,4,7}
};
vtkNew<vtkPolyData> geometry;
vtkNew<vtkPoints> points;
for (size_t i = 0; i < 8; i++)
{
points->InsertPoint(i, x[i]);
}
vtkNew<vtkCellArray> polys;
for (size_t i = 0; i < 6; i++)
{
polys->InsertNextCell(4, pts[i]);
}
geometry->SetPoints(points);
geometry->SetPolys(polys);
vtkNew<vtkPolyDataMapper> geometryMapper;
geometryMapper->SetInputData(geometry);
vtkNew<vtkActor> geometryActor;
geometryActor->SetMapper(geometryMapper);
vtkNew<vtkRenderer> renderer;
renderer->AddActor(geometryActor);
renderer->ResetCamera();
renderer->SetBackground(0, 0, 0);
vtkNew<vtkRenderWindow> renWin;
renWin->AddRenderer(renderer);
renWin->SetSize(300, 300);
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetRenderWindow(renWin);
renWin->Render();
iren->Start();
使用三角带拓扑结构
vtkNew<vtkCellArray> polys;
polys->InsertNextCell(8);
for (size_t i = 0; i < 8; i++)
{
polys->InsertCellPoint(i);
}
geometry->SetPoints(points);
geometry->SetStrips(polys);
使用vtkPolyData的SetStrips方法设置三角形带单元；
