Werner, I have never switched render targets at runtime before, but I have switched attachments and needed to call camera->dirtyAttachmentMap() after calling attach() or detach(). Maybe that will work.
Glenn Waldron On Thu, Mar 9, 2017 at 9:10 AM, Werner Modenbach <[email protected] > wrote: > Hi all. > > Is it possible to redirect the main camera of a view temporarily to a FBO? > It is my intention to get a snapshot of the scene with a modified > projection matrix. > I think about something like that: > > osg::ref_ptr<osg::Camera> camera = view->getCamera(); > osg::Camera::RenderTargetImplementation rti = camera-> > getRenderTargetImplementation(); > osg::Matrixd projectionMatrix = view->getCamera()->getProjectionMatrix(); > > camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); > > osg::ref_ptr<osg::Image> fbImage = new osg::Image; > > fbImage->allocateImage(width,height,1,GL_RGBA,GL_UNSIGNED_BYTE, 1); > > > camera->attach( osg::Camera::COLOR_BUFFER, fbImage.get(), 0, 0); > > camera->setProjectionMatrix( projectionMatrix * offsetMatrix ); > > > view->frame(); > > camera->setRenderTargetImplementation(rti); > camera->detach( osg::Camera::COLOR_BUFFER ); > > camera->setProjectionMatrix( projectionMatrix ); > > > > I tried it but my screen gets updated on the frame() call with the > modified projection matrix > and the image stays black. > > Thanks for any hints. > > - Werner - > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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