[osg-users] osgQt + OSG 3.6.2 Status

[James Davis]

I'm no code guru (more like a hacker), but I'll post what I do if it makes sense and helps.  Had to hand-type this as my code is on a different PC and I couldnt copy.  You'll probably see some typos and short cuts.   

My setup is in a class called OSGDataViewer which double inherits a view base class (pretty much a QMainWindow) and a CompositeViewer.

I define a osgQt::GraphisWindowQt* m_gw member along with all my manipulators, rootnode hud etc in this OSGDataViewer class.

In my constructor, I call a method initializeOSG() which does the following:

setThreadModel(osgViewer::Viewer::SingleThreaded);
osg::ref_ptr<osg::Camera> cam0 = this->createCamera(x(), y(), height(), "Main Camera", false); //more on createCamera in a bit.  x,y,width,height comes from qmainwindow

QWidget* GLWidget = m_gw->getGLWidget();

//finally set my central widget
this->setCentralWidget(GLWidget);

I then setup a cam1 which is my hud camera.  I'll post if you want to see it.

Next I set up my root node, depthPartitionNode, and others.

finally, I'll call another local method:
addNewView(cam0.get(), rootnode.get(), "MainView") //i'd call this with cam1 also.  This method is described below also

finally, my difference scene manipulators are created  and i'd do something like the following:

this->getView(0)->setCameraManipulator(m_keyswitchManipulator.get())

I'd also setup callbacks as example:
this->getView(1)->getCamera()->setFinalDrawCallbac(w_WinCapCallback.get())

------------
here is my createCamera method:
osg::Camera* OSGDataViewer::createCamera(int x, y, w, h, name...)
osg::ref_ptr<osg::DisplaySettings> ds = osg::DisplaySettings::instance();
ds->setMaxNumberOfGraphicContext(20)
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->readDISPLAY
if (traits->displayNum<0) traigs->displayNum=0;

traits->windowName = name
traits->.....
  x=x
  y=y
  width=w
  alpha = ds->getMinimumNumberAlphaBits
  stencil = ds->getMinimumNumStencilBits()
  windowDecoration = false
  doubleBuffer = true;
  sampleBuffers = ds->getMultiSamples
  samples = ds->getNumMultiSamples

  traits->inheritedWindowData = new osgViewer::GraphicsWindowWin32::WindowData((HWND)QWidget::winID());
osgQt::GraphicsWindowQt *GWQ;

if (!m_gw)
  traits->sharedContext = 0;
   GWQ = new osgQt::GraphicsWindowQt(traits.get())
   GWQ->createNewContextID
else
   traits->sharedContext = m_gw
   GWQ = new osgQt::GraphicsWindowQt(traits.get())
   GWQ->createNewContextID();

GWQ->setName(name)
osg::ref_ptr<osg::Camera> camera = new osg::Camera()
camera->setGraphicsContext(GWQ);

QWidget* GLWidget = GWQ->getGLWidget();
GLWidget->setAttribute(Qt::WA_PaintOnScreen)
   .....                                 WA_NoSystemBackground
                                         WA_OpaquePaintEvent
                                         WA_DeleteOnClose
GLWidget->setAttribute(Qt::ClickFocus)

camera->setClearColor(...
camera->setViewPort(new osg::Viewport(0, 0, traits->width, traits->height))
camera ->setLODScale(3.0)
camera->setProjectionMatrixAsPerspective(......
osg::StateSet* stateset = camera->getOrCreateStateSet()
stateset->setGlobalDefaults()
return camera.release()


------------
here is my addNewView method:
void OSGDataViewer::addNewView(osg::Camera* camera, osg::Node* scene, string viewname)

osgVIewer::View* view = new osgVIewer::View;
view->setCamera(camera)
view->adddEventHandler(new osgGA::StateSetManipulator(view->getCamera()->getOrCreateStateSet()))
view->addEventHandler(new osgVIewer::ThreadingHandler)
....                                                      ::WindowSizeHandler)
                                                          ::StatsHandler)
view->setLightingMode(osg::View::SKY_LIGHT)
view->getDatabasePaer()->setUnrefImageDataAfterApplyPolicy(true, valse)

this->addView(view)

view->setSceneData(scene);                        

Hope this is as clear as mud!

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=74359#74359