Hi Carsten,
thanks for the reply! Looking at your code I found that the problem was in
the line
m_pFBO->setFboOn(false);
which I hadn't. What this line means? When I added it the grabforeground started
working, but shadow maps now have some serious problems.. :)
Thanks for your help,
Stefano
Quoting Carsten Neumann <[EMAIL PROTECTED]>:
> Hi Stefano,
>
> On Wed, 2007-08-29 at 17:33 +0200, [EMAIL PROTECTED] wrote:
> > Hi there!
> > I'm trying to save the content of an FBO into an image using the
> > GrabForeground class.. here is the code I use:
> >
> > ImagePtr img = Image::create();
> > beginEditCP(img);
> > img->setPixelFormat(Image::OSG_RGBA_PF);
> > endEditCP(img);
> >
> > GrabForegroundPtr grabber = GrabForeground::create();
> > beginEditCP(grabber);
> > grabber->setImage(img);
> > grabber->setActive(true);
> > grabber->setAutoResize(true);
> > endEditCP(grabber);
> >
> > m_pFBO->setBackground(SolidBackground::create());
> > m_pFBO->setCamera(m_pRenderAgent->getCamera());
> > m_pFBO->setScene(makeCoredNode<Group>());
> ^^^^^^^^^^^^^^^^^^
> I don't have that method in my FBOViewport (there is only setRoot, which
> probably does the same), but it makes me wonder what version you are
> using?
>
> > m_pFBO->addForeground(grabber);
> > m_pFBO->render(m_pRenderAgent->getRenderAction());
>
> There are two issues here, I believe:
> 1) You don't add any textures to the FBOViewport, so it does not have
> any color buffers to render into. I have attached a (crude) test program
> that basically does what you want, not that it is expected that writing
> of fboImage fails, but grabImage will contain the image (without
> lighting though, because the only light is the headlight added by the
> SimpleSceneManager).
>
> 2) Since you do not have a window to which the FBOViewport is attached,
> you must be careful that there is actually an active OpenGL context for
> the call to m_pFBO->render(...). That's why the attached program does
> the actual creation of the screenshot in the display function and not in
> the keyboard function.
>
> Hope it helps,
> Carsten
>
> > // save data
> > char path[255] = "c:\\temp";
> > boost::filesystem::path p(path);
> > p /= ("hithere.png");
> >
> > printf("Saving image %s\n", p.string().c_str());
> > if (!img->write(p.native_file_string().c_str())) {
> > printf("Error writing screenshot\n");
> > } else {
> > printf("Done writing screenshot\n");
> > }
> >
> > img->write() returns me success, an image with the right dimensions gets
> saved,
> > but it's full of (0,0,0,0) while I should get a full black image, right?
> > Is there something wrong? GrabForeground (and glReadPixels) should work
> > correctly with FBOs as I'm reading on the web... isn't it?
> >
> > Thanks a lot,
> > Stefano Verna
> >
> >
> >
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