OK, it seems that there is something odd in osg code.
As found in another topic views that uses the same graphic context don't need
to be added to the compisite viewer at all but a simple instantiation make them
appear on the composite viewer: that seems counterintuitive.
Moreover the compositeviewer example uses addView() even if the graphic context
is the same for all viewes: so it seems the intent was to use addView to add a
view not just create it!
The code of removeView() (and its counterpart addView()) behaves just like the
view should be removed from the composite viewer but indeed it does not happen.
I don't think the intent of a public API like addView/removeView was
implemented with such a behavior in mind.
But there's something even more strange. If an added view is kept alive by a
ref_ptr (see example below) the removeView() does not work as expected. On the
contrary, removing comments from the following code, removeView works fine.
Gianni
Code:
#include <osgViewer/CompositeViewer>
#include <osg/GraphicsContext>
int main( int argc, char** argv )
{
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
traits->x = 100;
traits->y = 100;
traits->width = 500;
traits->height = 300;
traits->depth = 16;
traits->windowDecoration = true;
traits->supportsResize = true;
traits->doubleBuffer = true;
osg::ref_ptr<osg::GraphicsContext> graphicscontext =
osg::GraphicsContext::createGraphicsContext(traits);
osgViewer::CompositeViewer viewer;
osgViewer::View * redView = new osgViewer::View();
redView->setSceneData(new osg::Group);
redView->getCamera()->setClearColor(osg::Vec4f(0.5,0,0,1));
redView->getCamera()->setViewport(50, 50, 300, 100);
redView->getCamera()->setGraphicsContext(graphicscontext);
osg::ref_ptr<osgViewer::View> greenView = new osgViewer::View();
//osgViewer::View * greenView = new osgViewer::View();
greenView->setSceneData(new osg::Group);
greenView->getCamera()->setClearColor(osg::Vec4f(0,0.5,0,1));
greenView->getCamera()->setViewport(100, 100, 300, 100);
greenView->getCamera()->setGraphicsContext(graphicscontext);
viewer.addView(redView);
viewer.addView(greenView);
viewer.removeView(greenView);
return viewer.run();
}
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=57547#57547
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