Hi,
sorry I might have answered too fast. What do you want the main camera
to render when you are taking screenshots? What is it rendering when
when you only attach the FBO camera?
AFAIK you still need to call viewer frame() to trigger the FBO, but you
can make the main camera just render nothing. If you want to run an FBO
camera without creating a window, then consider the pbuffer option for
the main frame buffer.
See also maybe the osgscreencapture example.
jp
J.P. Delport wrote:
Hi,
have a look at the osgautocapture example. Set the main camera to render
offscreen, pbuffer.
jp
jake chambers wrote:
Hi,
I have an application where I setup a "normal" osgViewer view with
setUpViewOnSingleScreen(). This works fine.
I also create an FBO camera to which I add my scene. When I want to
take a screenshot of the application I call
osgviewer->setSceneData(myFBOCamera) and render via
osgviewer->eventTraversal() / updateTraversal() /
renderingTraversals(). After I get the screenshot I restore my normal
scene with osgviewer->setSceneData(mySceneData). This also works fine
for taking screenshots.
What I want to do now is to turn off the "main" camera whilst I render
the FBO (ie if I create a lot of screenshots for a movie I don't want
to render to the screen). How can I turn off the main camera and
render only to the FBO?
I've tried calling osgviewer->setCamera(NULL) without sucess. Indeed
when I meddle with the main camera I dont get a valid image from my
FBO. I think this makes sense as the FBO is under the main camera(?).
I also tried calling osgviewer->setCamera(myFBO) but no luck that way
either. I also can't restore the original camera to the osgviewer.
Perhaps I am solving the problem the wrong way - is there a better
method? Perhaps having two seperate osgViewer objects? But then I
think I have only one conceptual "View" (my FBO always shows the same
view as the main camera, it's only a question of if the main camera
should render an image or not), so having one Viewer, one View and two
Cameras feels correct - it's just that it doesn't work :-)
Thank you!
Cheers,
jake
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=16079#16079
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