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>());
m_pFBO->addForeground(grabber);
m_pFBO->render(m_pRenderAgent->getRenderAction());
// 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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