Question

我有一个在循环中调用的函数，并且在每次传递时它给出了3D点的（x，y，z）。我试图使用VTK实时连接这些点，但我无法在每帧后刷新渲染窗口。如果我退出循环，我会看到一堆行。

基本上，这就是我在做的事情：

// 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(); 
}

如果我在循环之外renderer->Render()，我会得到所有的行（或者至少我认为我这样做）。有人能弄明白我哪里错了吗？

Answer 1

从these docs开始，您似乎不应直接致电

renderer->Render();

你应该只打电话

renderWindow->Render();

使用VTK连接流媒体点

1 个答案: