c++ - 使用 VTK 连接流媒体点

Question

我有一个在循环中调用的函数，每次通过它都会给出 3D 点的 (x,y,z)。我正在尝试使用 VTK 实时连接这些点，但我无法让渲染窗口在每一帧后刷新。不过，如果我退出循环，我会看到一堆行。

基本上，这就是我正在做的:

// Create a vtkPoints object to store the points in it
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();

vtkSmartPointer<vtkPolyLine> polyLine = vtkSmartPointer<vtkPolyLine>::New();

// Create a cell array to store the lines in   
vtkSmartPointer<vtkCellArray> lines = vtkSmartPointer<vtkCellArray>::New();

// Create a polydata to store everything in
vtkSmartPointer<vtkPolyData> linesPolyData = vtkSmartPointer<vtkPolyData>::New();

// Setup actor and mapper
vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();

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

// Setup render window, renderer, and interactor
vtkSmartPointer<vtkRenderer> renderer =  vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =       vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =   vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);

renderer->AddActor(actor);
renderWindow->Render();
renderer->Render();

int numpoints = 0;

while(some_condition)
{
  call_function(&x,&y,&z);
  double point[3] = {0.0, 0.0, 0.0};
  point[0] = (float)x;
  point[1] = (float)y;
  point[2] = (float)z;

  numpoints++;
  points->InsertNextPoint(point);

  polyLine->GetPointIds()->SetNumberOfIds(numpoints);
  for(unsigned int i = 0; i < num_points; i++)
{
    polyLine->GetPointIds()->SetId(i,i);                        
}

  lines->InsertNextCell(polyLine);

// Add the points to the dataset
linesPolyData->SetPoints(points);

// Add the lines to the dataset
linesPolyData->SetLines(lines);

#if VTK_MAJOR_VERSION <= 5
mapper->SetInput(linesPolyData);
#else
mapper->SetInputData(linesPolyData);
#endif

linesPolyData->Modified();
linesPolyData->Update();

renderWindow->Render();
renderer->Render();

renderWindowInteractor->Enable();

check_loop_exit_condition(); 
}

如果我在循环外执行 renderer->Render()，我会得到所有的行(或者至少我认为我会)。有人能找出我哪里出错了吗？

Answer 1

来自 these docs , 看来你不应该直接打电话

renderer->Render();

你应该只调用

renderWindow->Render();