Hi,
I thought this would be extremely trivial. But, perhaps I am missing something.
I have a HUD ortho2D camera slaved to a main view window camera, rendering a
polygon. I need to move the polygon when I resize the main window, which I
attempted by simply placing the geode underneath a MatrixTransform node, first
setting it to identity() and placing it under the HUD camera. However, when I
did this, the polygon no longer is rendered in the window at all.
Note that everything renders fine with a Geode before I placed it under the
MatrixTransform.
To recap this is essentially what I tried:
m_HUDcam = new osg::Camera;
m_HUDcam->setProjectionMatrix( osg::Matrix::ortho2D(0,
m_viewersize.GetX(),0, m_viewersize.GetY()));
m_HUDcam->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
m_HUDcam->setClearMask(GL_DEPTH_BUFFER_BIT);
// draw subgraph after main camera view.
m_HUDcam->setRenderOrder(osg::Camera::POST_RENDER,0);
m_HUDcam->setAllowEventFocus(false);
// create the frame
osg::MatrixTransform * matrixtransfm = new osg::MatrixTransform;
matrixtransfm->setMatrix(osg::Matrix::identity());
// create the Geode (Geometry Node) to contain all our osg::Geometry
objects.
osg::Geode* geode = new osg::Geode();
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
matrixtransfm->setChild(0, geode);
// <.... construct the polygon(s) primitive(s) here ...>
// attach it to the HUD camera -- now the polygon(s) don't display.
m_HUDcam->addChild(matrixtransfm);
// but uncommenting this out, and polygon displays :
// m_HUDcam->addChild(geode);
// viewport, etc.
m_HUDcam->setViewport( 0 ,0, m_viewersize.GetX(),
m_viewersize.GetY());
m_HUDcam->setGraphicsContext(gw);
m_viewer->addSlave(m_HUDcam, false);
Thank you!
Cheers,
Ted
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=33347#33347
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