如何把vtkGenericOpenGLRenderWindow保存为JPG图片？

Question

编程语言：C++
操作系统：Windows11
编译器：VS2022社区版
第三方库：VTK+QT
我总是遇到readpixels called before windows is ready for rendering;ignoring的错误。

Answer 1

#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkWindowToImageFilter.h>
#include <vtkJPEGWriter.h>
#include <vtkGenericOpenGLRenderWindow.h>

vtkSmartPointer<vtkGenericOpenGLRenderWindow> renderWindow = vtkSmartPointer<vtkGenericOpenGLRenderWindow>::New();

renderWindow->Render();

vtkSmartPointer<vtkWindowToImageFilter> windowToImageFilter = vtkSmartPointer<vtkWindowToImageFilter>::New();
windowToImageFilter->SetInput(renderWindow);
windowToImageFilter->Update();

vtkSmartPointer<vtkJPEGWriter> writer = vtkSmartPointer<vtkJPEGWriter>::New();
writer->SetFileName("output.jpg");
writer->SetInputConnection(windowToImageFilter->GetOutputPort());
writer->Write();