Enrico -
is the image really empty, or a small size like 2x2?
If you're trying to save the images to files, use OSGGrabFileForeground
instead of just plain OSGGrabForeground :
FileGrabForegroundPtr fgp = FileGrabForeground::create();
string s;
s.assign("%04d.png");
beginEditCP(fgp);
fgp->setName(s);
fgp->setActive(true);
fgp->setIncrement(true);
fgp->setAutoResize(true);
endEditCP(fgp);
f_worldP->getViewport()->getMFForegrounds()->push_back(fgp);
_SLOG(f_pslog, render::util::sINFO, "Grabbing frames and saving
to file(s) named " + fgp->getName());
_SLOG(f_pslog, render::util::sINFO, "Expect slow performance!!!");
The FileGrabForeground automatically saves to files named, in this
example, 0000.png, 0001.png, etc. This assumes that you have compiled
png support into your OSG libs (jpg extension allowed, also, if you
compiled in jpg support).
Nice thing about FileGrabForeground is that it automatically allocates
the Image for you. The 'setAutoResize(true)' call automatically resizes
the images saved to the window size.
**Caution** this saves one image per frame..... Don't run a long app at
high resolution unless you have a lot of time and disk space!
One final word of caution. If running XWindows (not sure about Windows)
you have to ensure that the window's resize() function is called once
prior to rendering. If you're running fullscreen, that might not happen
if you use the CONFIGURE_NOTIFY event to resize the window (e.g. by
calling window->resize(w, h) from that event in your x event loop),
because at fullscreen on XWindows the CONFIGURE_NOTIFY event does not
get called! Its safe to just call window->resize(w, h) with the correct
values - all it does is save those values in the Window object for later
retrieval.
Dan
Enrico wrote:
> Hi opensg users,
>
>
>
> i am working to a cluster/server application.
>
> I would like to take screenshots of what is being rendered
>
> On the remote windows,
>
> so I attached to the viewport a GrabForegroundPtr.
>
>
>
> The problem is that when I try to save the grabbed image,
>
> it is empty.
>
>
>
> fgndImage->setActive(true);
>
> m_pMgr->redraw(); // render pass
>
> fgndImage->setActive(false);
>
>
>
> // get foreground image
>
> beginEditCP(fgndImage, GrabForeground::ImageFieldMask);
>
> ImagePtr img = fgndImage->getImage();
>
> endEditCP(fgndImage, GrabForeground::ImageFieldMask);
>
>
>
> //get pixel data
>
> beginEditCP(fgndImage, Image::PixelFieldMask);
>
> UInt8 *imageData = img->getData();
>
> int width = img->getWidth();
>
> int height = img->getHeight();
>
> endEditCP(fgndImage, Image::PixelFieldMask);
>
>
>
> Does anyone has any clue?
>
>
>
> Thanks
>
> E.
>
>
>
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--
Daniel J. Sperka, Ph. D.
UC Davis Center for Neuroscience
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