Hi Ufuk,
The CompositeViewer and Viewer should have exactly the same
performance characteristics w.r.t managing multiple cameras - as it's
exactly the same ViewerBase code underneath that is managing all the
threading and graphics rendering.
If you own app is not performing the same then it could be down to the
threading model used, or something else particular. Please note that
some graphics drivers will do swap buffers in sequence if you have
multiple windows being rendered too, with each swap doing a vsync,
which ends up with each window blocking till the end of each screen
refresh. Use of the swap groups extension would be one way around
this issue, unfortunately osgViewer doesn't yet provide this
functionality, it should be possible to integrate it though.
Robert.
On Mon, Feb 9, 2009 at 1:44 PM, Ufuk <ufuk....@gmail.com> wrote:
> Hi,
> i am trying to apply multi camera on my project. I am referencing "Examples
> osgcamera".
> Here i did almost the same with your examples but there are few changes.
> Maybe this changes causes problems because in your examples runs in 60fps
> even there are 6 windows. My fps is 60fps/numberOfWindows :(
> so i want to ask some questions about this.
>
> Here is my code about multi window:
>
> ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
> void MyApplication::multipleWindowMultipleCameras()
> {
> const int numberOfWindows = 4;
>
> osg::GraphicsContext::WindowingSystemInterface* wsi =
> osg::GraphicsContext::getWindowingSystemInterface();
> unsigned int screenWidth, screenHeight;
> wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0),
> screenWidth, screenHeight);
>
> double aspectRatioScale = (double)numberOfWindows / 2;
> double translate_x = double(numberOfWindows) - 1;
>
> simBase::SimCamera* camera; //SimCamera encapsulates osgCamera.
>
> for (int i = 0; i < numberOfWindows ; i++, translate_x -= 2.0)
> {
> if (i == 0)
> {
> camera = getCamera(); //myApplication main camera.
> }
> else
> {
> camera = new simBase::SimCamera(); //new camera which shows
> other parts of scene.
> }
>
> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
> osg::GraphicsContext::Traits;
> traits->screenNum = 0;
> traits->x = (i * screenWidth) / numberOfWindows;
> traits->y = 0;
> traits->width = screenWidth/numberOfWindows - 1;
> traits->height = screenHeight;
> traits->windowDecoration = true;
> traits->doubleBuffer = true;
> traits->sharedContext = 0;
>
> osg::ref_ptr<osg::GraphicsContext> gc =
> osg::GraphicsContext::createGraphicsContext(traits.get());
>
> osg::Camera* osgCamera = camera->getOSGCamera();
> osgCamera->setGraphicsContext(gc.get());
> osgCamera->setViewport(new osg::Viewport(0,0, screenWidth /
> numberOfWindows, screenHeight));
> GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
> osgCamera->setDrawBuffer(buffer);
> osgCamera->setReadBuffer(buffer);
>
> simBase::SimView* view = getView(); //SimView encapsulates
> osgViewer::View.
> if (i != 0) //if i apply this process to main camera, then i see
> nothing on the scene. So i disabled this for first camera.
> view->addSlave(camera, osg::Matrix::scale(aspectRatioScale,
> 1.0, 1.0)*osg::Matrix::translate(translate_x, 0.0, 0.0), osg::Matrix() );
> }
> }
> ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
>
> One important distance here is: i use "osgViewer::View" directly. I dont use
> "osgViewer::Viewer". and MyApplication has a "osgViewer::CompositeViewer".
> Even if i call the function as
> getCompositeViewer()->getView(0)->addSlave(osgCamera,
> osg::Matrix::scale(aspectRatioScale, 1.0,
> 1.0)*osg::Matrix::translate(translate_x, 0.0, 0.0), osg::Matrix() );
>
> So i wonder, is it really that much different to use CompositeViewer or
> Viewer.
> Our design looks like a bit Delta3D (maybe you know) so i wanted to get some
> advices about this..
>
> I wanted to know if Viewer has capability show multiscreen better than
> CompositeViewer or something else...
>
>
> --
> Ufuk
>
> _______________________________________________
> osg-users mailing list
> osg-users@lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
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