Question

我创建了一个二十面体并对其进行了细分，我并没有尝试显示它，但它似乎正在显示它未细分。这是我的代码：

vtkSmartPointer<vtkPlatonicSolidSource> icosahedron = vtkSmartPointer<vtkPlatonicSolidSource>::New();
     icosahedron->SetSolidTypeToIcosahedron();
     icosahedron->Update();

     cout << " Centre is " << icosahedron->GetOutput()->GetCenter()[0] << ", " << icosahedron->GetOutput()->GetCenter()[1] << ", " << icosahedron->GetOutput()->GetCenter()[2] << endl;
     cout << "    There are " << icosahedron->GetOutput()->GetNumberOfPolys() << " triangles." << endl;
     cout << " there are " << icosahedron->GetOutput()->GetNumberOfPoints() << " points " << endl;

     vtkSmartPointer<vtkPolyDataAlgorithm> subdivisionFilter;
     subdivisionFilter = vtkSmartPointer<vtkLinearSubdivisionFilter>::New();
     dynamic_cast<vtkLinearSubdivisionFilter *> (subdivisionFilter.GetPointer())->SetNumberOfSubdivisions(2);
     subdivisionFilter->SetInput(icosahedron->GetOutput());
     subdivisionFilter->Update();

     cout << " After " << endl;
     std::cout << "    There are " << subdivisionFilter->GetOutput()->GetNumberOfPoints() << " points." << std::endl;
     std::cout << "    There are " << subdivisionFilter->GetOutput()->GetNumberOfPolys() << " triangles." << std::endl;


     vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
     mapper->SetInputConnection(subdivisionFilter->GetOutputPort());

     vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
     actor->SetMapper(mapper);

     vtkSmartPointer<vtkRenderer> renderer =  vtkSmartPointer<vtkRenderer>::New();
     vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();

     renderWindow->AddRenderer(renderer);

     vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
     renderWindowInteractor->SetRenderWindow(renderWindow);

     //Add the actors to the scene
     renderer->AddActor(actor);
     renderer->SetBackground(.1, .2, .3);

     //Render and interact
     renderWindow->Render();
     renderWindowInteractor->Start();

控制台输出是：

 Centre is 0, 0, 0
    There are 20 triangles.
 there are 12 points 
 After 
    There are 162 points.
    There are 320 triangles.

确认它确实已被细分。

Answer 1

打开线框模式后，我可以看到分歧：

#include <vtkProperty.h>
....
actor->GetProperty()->SetRepresentationToWireframe();

您所看到的是该算法是在与现有三角形相同的平面中添加新点，因此当您将结果渲染为曲面时，它看起来并没有任何不同。

VTK：显示细分多边形

1 个答案: