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
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