如何在不向用户显示的情况下在后台运行 vtkRenderWindow

Question

我正在使用可以从 dicom 文件创建冠状、矢状和轴向图像的代码，但同时我不需要向用户显示 renderWindow，这是我的代码：

int main(int argc, char* argv[])
{
   // Verify input arguments
   if ( argc != 2 )
   {
      std::cout << "Usage: " << argv[0]
      << " FolderName" << std::endl;
      return EXIT_FAILURE;
   }

   std::string folder = argv[1];
   //std::string folder = "C:\VTK\vtkdata-5.8.0\Data\DicomTestImages";

   // Read all the DICOM files in the specified directory.
   vtkSmartPointer<vtkDICOMImageReader> reader =
      vtkSmartPointer<vtkDICOMImageReader>::New();
   reader->SetDirectoryName(folder.c_str());
   reader->Update();

   // Visualize
   vtkSmartPointer<vtkImageViewer2> imageViewer =
      vtkSmartPointer<vtkImageViewer2>::New();
   imageViewer->SetInputConnection(reader->GetOutputPort());
imageViewer->SetSlice(0);
  imageViewer->Render();

for(int k = 0; k < 3; k++){

cout<< k << endl;

if(k == 0){
imageViewer->SetSliceOrientationToYZ();
}else if(k == 1){
imageViewer->SetSliceOrientationToXZ();
}else{
 imageViewer->SetSliceOrientationToXY();
}
    int _MinSlice = imageViewer->GetSliceMin();
        int _MaxSlice = imageViewer->GetSliceMax();

     // Screenshot  
  vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter = 
    vtkSmartPointer<vtkWindowToImageFilter>::New();

 vtkSmartPointer<vtkPNGWriter> writer = 
    vtkSmartPointer<vtkPNGWriter>::New();
for (int i = _MinSlice; i < _MaxSlice; i++){
  vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter = 
    vtkSmartPointer<vtkWindowToImageFilter>::New();

 vtkSmartPointer<vtkPNGWriter> writer = 
    vtkSmartPointer<vtkPNGWriter>::New();

  windowToImageFilter->SetInput(imageViewer->GetRenderWindow());
  windowToImageFilter->ReadFrontBufferOff(); // read from the back buffer
  windowToImageFilter->Update();

  std::string filename = "img/" + std::to_string(k) + "/" + std::to_string(i) + ".png";
  char *y = new char[filename.length() + 1];
  std::strcpy(y, filename.c_str());

  writer->SetFileName(y);
  writer->SetInputConnection(windowToImageFilter->GetOutputPort());
  writer->Write();

  imageViewer->SetSlice(i);
  imageViewer->Render();
}
}

   return EXIT_SUCCESS;
}

我的问题是当尝试 imageViewer->SetRenderWindow(NULL); 或 imageViewer->GetRenderWindow()->Delete(); 时，它会删除 renderWindow 实例，并且代码会中断，这样我如何才能让 renderWindow 在后台工作而不向用户显示它？

谢谢

Answer 1

您可以使用SetShowWindow(bool) 或ShowWindowOff()，这些方法是从vtkWindow 继承而来的。这样做不应该停止渲染管道（您可能仍然可以使用 windowToImageFilter），但老实说我没有测试它。让我们知道它是否有效。

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