Using FBO Created with QT

Hello,

is it possible to render in frame buffer object created with QT?

I'm trying to create a FBO using QOpenGLFrameBuffer object and I bind to the context. The QT openGL context is created using the native context created by OCCT.

now if I check the current bound frame buffer before and after a view_->redraw() , the value is not the same

glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &drawFboId);
if(!view_.IsNull())
    view_->Redraw();
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &drawFboId);

 

if I check the value of drawFboId before and after, the value is different (  before is different from zero, after is zero ).

 

The result of this behaviour is that the image obtained from the FBO is not correct ( a black rectangle ).

How can I use the FBO created with QT to render OCCT?

thank you