Hi,
jake chambers wrote:
Hi,
Thanks for the replies.
Brian: when I set the nodemask on the main camera to zero it no longer renders, which is good, but the FBO no longer gets rendered (I get a totally black image in the associated osg::Image).
JP: If I just insert my FBO into the scene (as POST_RENDER) two things happen
when I render a frame: I get the correct image in my FBO, but the main camera
also renders. I want to be able to choose if the the main camera should render
or not when the FBO is in use.
I'm still confused about what you actually want to do. Would it be OK if
the main camera image is just empty? If so, if you add the scene to your
FBO camera (make it pre_render) and add only the node containing the FBO
camera to your main camera, the main camera should render nothing (you
should get the clearcolor) when you call viewer.frame(). The main camera
would only render the scene if a scene is attached to it, it won't
render the FBO camera's scene.
I looked at osgautocapture, but it doesn't do what I need to do because the
main camera always renders (and has to as the saved image comes from a
DrawCallback on the main camera).
Also see osgscreencapture and grep for screencapturehandler.
jp
I've also tried simply putting my fbo directly into the viewer with:
savedcam=osgviewer->getCamera()
osgviewer->setCamera(myfbo)
osgviewer->renderingTraversals()
osgviewer->setCamera(savedcam)
But when I do this not only do I not get an image in my FBO, but the viewer
(with the normal camera) no longer renders afterwards.
I suspect a workable solution would be to create a duplicate Viewer, setup with
only an FBO as the main camera, and which shares the scene (and database
pager, etc) with the first Viewer. Then when I need to save screenshot(s) I can
just explicitly render with the second Viewer. But surely such a drastic
solution shouldn't be necessary?
Thank you!
Cheers,
jake
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http://forum.openscenegraph.org/viewtopic.php?p=16120#16120
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