Hi again, you are naturally quite right. I did a search for osg camera aspect ratio, and it turned out that there was a change in 2.8.0 regarding ABSOLUTE_RF for slave cameras. Setting this for my slave camera which is displaying the view fixed the problem completely (as far as I can tell). It might be absolutely correct that I'm still jumping through a couple of hoops regarding how the projectionmatrix is being set when resizing.
Thanks for your patience :) Jesper D. Thomsen AnyBody Technology A/S -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: 2. december 2010 16:05 To: OpenSceneGraph Users Subject: Re: [osg-users] Window content stretching when resized after updating from 2.6.1 to 2.8.3 Hi Jasper, I don't understand the details of what you are attempting to do, but the OSG directly supports resizing the projection matrix to keep the aspect ratio of the scene the same even when you resize the window. There are also controls in osg::Camera for controlling this. You shouldn't need to do anything special to handle window resize and projection matrix setting, instead you should be able to just set it at setup time and then not have to do anything there after. To me it feels like you are trying to do something overly complicated and likely unnecessary. Robert. On Thu, Dec 2, 2010 at 2:35 PM, Jesper D. Thomsen <[email protected]> wrote: > Hi Robert, thank you very much for your answer. It led me to implement at > rather hacky (in my mind at least solution). > > Instead of : > double r = (double)m_OSGView.aspect_ratio*t; > > I now use: > > double r = (double)m_OSGView.aspect_ratio*(double)m_OSGView.aspect_ratio*t / > mOSG->getOriginalAspect(); //where mOSG->getOriginalAspect() is the aspect > ratio from the creation time of the graphicscontext. > > This gives me exactly the same view as in my 2.6.1 version when resizing the > window, even though it feels very hacky. > > Thank you very much for your help. > > Jesper D. Thomsen > AnyBody Technology A/S > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Robert Osfield > Sent: 2. december 2010 14:40 > To: OpenSceneGraph Users > Subject: Re: [osg-users] Window content stretching when resized after > updating from 2.6.1 to 2.8.3 > > Hi Jasper, > > There is chance that the issue comes from a fix to a bug rather than > introduction of a bug, with your original code working around the bug. > Removing the workaround could well just fix things. The reason why I > suggest that is that I recall merging fixes to the way the projection > matrices are updated, I don't recall the dates though, but I'm sure it's > since 2.6.x. > > Try just removing your code that attempts to update the projection matrix > when you the window is resized. > > Robert. > > On Thu, Dec 2, 2010 at 12:46 PM, Jesper D. Thomsen <[email protected]> > wrote: >> Hi all, I had hoped I would figure this out myself, but no luck so far. >> >> >> >> I just upgraded my OSG usage from 2.6.1 to 2.8.3, and without >> changing anything about how my windows are set up, I'm now getting a >> behavior where the viewed contents of a window stays the same when >> the window is rescaled, whereas in 2.6.1 I would have a constant >> pixel-size for the contents of the window when resized. Please see >> the attached images if I'm not making myself clear enough (please >> note that the HUD-text is supposed to be stretched to the window size in >> both versions). >> >> >> >> I'm using a release OSG 2.8.3, compiled on Visual Studio 2005 sp1, on >> Vista >> 64 (Nvidia Quadro graphics card). >> >> >> >> The camera and graphics context are created like this (done once): >> >> >> >> RECT rect; >> >> mViewer = new osgViewer::Viewer(); >> >> mViewer->setThreadingModel(osgViewer::Viewer::SingleThreaded); >> >> ::GetWindowRect(m_hWnd, &rect); >> >> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new >> osg::GraphicsContext::Traits; >> >> osg::ref_ptr<osg::Referenced> windata = new >> osgViewer::GraphicsWindowWin32::WindowData(m_hWnd); >> >> traits->x = 0; >> >> traits->y = 0; >> >> traits->width = rect.right - rect.left; >> >> traits->height = rect.bottom - rect.top; >> >> traits->windowDecoration = false; >> >> traits->doubleBuffer = true; >> >> traits->sharedContext = 0; >> >> traits->setInheritedWindowPixelFormat = true; >> >> traits->supportsResize = true; >> >> traits->inheritedWindowData = windata; >> >> m_gc = osg::GraphicsContext::createGraphicsContext(traits.get()); >> >> camera = mViewer->getCamera(); >> >> camera->setGraphicsContext(m_gc.get()); >> >> camera->setViewport(new osg::Viewport(traits->x, traits->y, >> camera->traits->width, >> traits->height)); >> >> mViewer->addSlave(camera.get()); >> >> >> >> And for each frame I'm drawing I'm setting the camera like this: >> >> >> >> mOSG->getViewer()->getCamera()->getGraphicsContext()->resized(x, y, >> mOSG->w, h); >> >> mOSG->getViewer()->getCamera()->setViewport(x,y,w,h); >> >> double n = (double)m_OSGView.near_dist; >> >> double f = (double)(m_OSGView.far_dist + >> m_OSGView.eye_dist_add_ortho); >> >> double t = (double)(m_OSGView.focal_height/2.0f); >> >> double r = (double)m_OSGView.aspect_ratio*t; >> >> mOSG->getViewer()->getCamera()->setProjectionMatrixAsOrtho(-r,r,-t,t, >> mOSG->n >> mOSG->,f*50); >> >> >> >> >> The eyepoint is set via setViewMatrix elsewhere. >> >> >> >> This worked just fine in OSG 2.6.1, but the behavior has changed in >> 2.8.3, and I know that's it's probably something I'm either doing >> wrong or forgetting to do, but I would like to keep the pixel-aspect >> the same when resize the view, and any help/hints would be most >> welcome. I'm just about to create a new graphicscontext with new >> traits for each window resize, but I just know that that can't be the proper >> way to solve this. >> >> >> >> Regards, and thanks in advance. >> >> >> >> >> >> Jesper D. Thomsen >> >> AnyBody Technology A/S >> >> >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph. >> org >> >> > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph. > org _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph. > org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
