QVTKOpenGLWidget render() to returns blank image

gde23

Hello, I am trying to render a QVTKOpenGLWidget to a png file, however I just get a blank (white) png.
I want to render it together with other widgets therefore I cannot use the vtkPNGWriter.

Here is my code:

   QSize size = QSize(vtk_widget->width(), vtk_widget->height());
   QImage img = QImage(size, QImage::Format_ARGB32);
   QPainter painter(&img);
   m_vtk_widget->render(&painter);
   img.save(filename);

SGaist

Hi,

Based on the name I guess it derived from QOpenGLWidget so you should use grabFramebuffer.