Hi,
I'm trying to render a scene onto a UIView that's part of a UIViewController,
so that I can have iOS UI overlay on top of the OSG view.
I tried to achieve this by using the GraphicsWindowIOS class and binding it to
my internal view. This works fine except for one issue, the scene seems
stretched horizontally (in landscape orientation), even though its rendered at
fullscreen and there's no resizing happening.
This is the relevant part of the code I'm using:
Code:
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
CGRect lFrame = [self.osgView convertRect:self.osgView.frame
fromView:[UIApplication sharedApplication].keyWindow];
unsigned int w = lFrame.size.width * [[UIScreen mainScreen] scale];
unsigned int h = lFrame.size.height * [[UIScreen mainScreen] scale];
osg::DisplaySettings* settings = osg::DisplaySettings::instance();
settings->setNumMultiSamples(4);
osg::ref_ptr<osgViewer::GraphicsWindowIOS::WindowData> windata = new
osgViewer::GraphicsWindowIOS::WindowData(self.osgView,
osgViewer::GraphicsWindowIOS::WindowData::LANDSCAPE_LEFT_ORIENTATION, -1.0f);
// Setup the traits parameters
traits->x = lFrame.origin.x * [[UIScreen mainScreen] scale];
traits->y = lFrame.origin.y * [[UIScreen mainScreen] scale];
traits->width = w;
traits->height = h;
traits->windowDecoration = false;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->setInheritedWindowPixelFormat = false;
traits->inheritedWindowData = windata;
// Create the Graphics Context
osg::ref_ptr<osg::GraphicsContext> graphicsContext =
osg::GraphicsContext::createGraphicsContext(traits.get());
_root = new osg::MatrixTransform();
osg::ref_ptr<osg::Node> model = (osgDB::readNodeFile("full.ive"));
_root->addChild(model);
_viewer = new osgViewer::Viewer();
if(graphicsContext)
{
_viewer->getCamera()->setGraphicsContext(graphicsContext);
_viewer->getCamera()->setViewport(new osg::Viewport(traits->x,
traits->y, traits->width, traits->height));
}
_viewer->setSceneData(_root.get());
_cameraManipulator = new osgGA::MultiTouchTrackballManipulator();
_viewer->setCameraManipulator(_cameraManipulator);
_viewer->realize();
// draw a frame
_viewer->frame();
Here are my insights so far:
I tried playing with the traits parameters and that had no effect.
Using view.bounds or just view.frame as the lFrame also has no effect.
As I'm testing this on an iPhone 5, the only scale parameter from the OS that
would get the right value was [[UIScreen mainScreen] scale], using
view.contentScaleFactor returned 1 which was incorrect.
The most import thing I noticed was that if I do not use a graphics context
(for example by commenting out the setGraphicsContext line) the view appears on
the entire screen (like before) but with the correct aspect ratio, again, even
though there is seemingly no difference in the view's size.
I'm relatively new to OSG and I've been struggling with this issue for a couple
of days now so any tips on how to fix it will be greatly appreciated.
Thank you!
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http://forum.openscenegraph.org/viewtopic.php?p=55456#55456
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