几何对象的凸点集

// 引入VTK并初始化
#include "vtkAutoInit.h"
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);

#include 
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int main()
{
  // 创建一个凸多边形点集
  vtkNew<vtkConvexPointSet> cps;
  vtkNew<vtkPoints> points;
  // 插入点的坐标
  // 共有13个点，描述一个凸多边形
  // 前8个点构成一个立方体，后5个点在底面中心和四个边的中心
  points->InsertNextPoint(0, 0, 0);
  points->InsertNextPoint(1, 0, 0);
  points->InsertNextPoint(1, 1, 0);
  points->InsertNextPoint(0, 1, 0);
  points->InsertNextPoint(0, 0, 1);
  points->InsertNextPoint(1, 0, 1);
  points->InsertNextPoint(1, 1, 1);
  points->InsertNextPoint(0, 1, 1);
  points->InsertNextPoint(0.5, 0, 0);
  points->InsertNextPoint(1, 0.5, 0);
  points->InsertNextPoint(0.5, 1, 0);
  points->InsertNextPoint(0, 0.5, 0);
  points->InsertNextPoint(0.5, 0.5, 0);

  for (int i = 0; i < 13; ++i)
  {
    // 将点的ID插入凸多边形点集
    cps->GetPointIds()->InsertId(i, i);
  }

  // 创建一个非结构化网格并设置其几何数据
  vtkNew<vtkUnstructuredGrid> ug;
  ug->Allocate(1, 1);
  ug->InsertNextCell(cps->GetCellType(), cps->GetPointIds());
  ug->SetPoints(points);

  // 创建命名颜色对象
  vtkNew<vtkNamedColors> colors;

  // 创建数据集映射器
  vtkNew<vtkDataSetMapper> mapper;
  mapper->SetInputData(ug);

  // 创建演员（Actor）并设置其属性
  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
  actor->GetProperty()->SetLineWidth(3);
  actor->GetProperty()->EdgeVisibilityOn();

  // 为点创建球体源
  vtkNew<vtkSphereSource> sphere;
  sphere->SetPhiResolution(21);
  sphere->SetThetaResolution(21);
  sphere->SetRadius(.03);

  // 创建用于存储点和球体的多边形数据
  vtkNew<vtkPolyData> polyData;
  polyData->SetPoints(points);

  // 创建点的球体映射器
  vtkNew<vtkGlyph3DMapper> pointMapper;
  pointMapper->SetInputData(polyData);
  pointMapper->SetSourceConnection(sphere->GetOutputPort());

  // 创建点的演员并设置其属性
  vtkNew<vtkActor> pointActor;
  pointActor->SetMapper(pointMapper);
  pointActor->GetProperty()->SetColor(colors->GetColor3d("Peacock").GetData());

  // 创建渲染器、渲染窗口和交互器
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetWindowName("ConvexPointSet");
  renderWindow->AddRenderer(renderer);
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // 将演员添加到场景中
  renderer->AddActor(actor);
  renderer->AddActor(pointActor);
  renderer->SetBackground(colors->GetColor3d("Silver").GetData());

  // 重置相机位置并设置视角
  renderer->ResetCamera();
  renderer->GetActiveCamera()->Azimuth(210);
  renderer->GetActiveCamera()->Elevation(30);
  renderer->ResetCameraClippingRange();

  // 渲染并交互
  renderWindow->SetSize(640, 480);
  renderWindow->Render();
  renderWindowInteractor->Start();

  return 0;
}