Hello, OpenSG friends,
as i wrote a couple of days ago, I am working on a cave application that
needs tracking of the head position.
Some of the first answers pointed me in the direction of the
ProjectionCameraDecorator so I gave a look at the threads concerning the use
of this decorator. I've made an hasty integration of the
ProjectionCameraDecorator in my code, but I must be missing something as the
head isn't tracked at all (although at least the cave viewports and cameras
are working :) ).
Here is how I set up the decorators:
For (every cave face)
{
osg::Pnt3f screenUpperRight;
osg::Pnt3f screenUpperLeft;
osg::Pnt3f screenLowerLeft;
osg::Pnt3f screenLowerRight;
... some code setting up the screen dimensions
... some more code setting up the cave face main camera
If (face==FRONT_CAVE_FACE)
{
m_pUserBeaconNode = osg::Node::create ();
osg::TransformPtr tran = osg::Transform::create ();
beginEditCP (m_pUserBeaconNode, osg::Node::CoreFieldMask);
m_pUserBeaconNode->setCore (tran);
endEditCP (m_pUserBeaconNode, osg::Node::CoreFieldMask);
beginEditCP(main_beacon,osg::Node::ChildrenFieldMask);
main_beacon->addChild (m_pUserBeaconNode);
endEditCP(main_beacon,osg::Node::ChildrenFieldMask);
}
// stereo camera decorators creation
osg::ProjectionCameraDecoratorPtr leftCamera=
osg::ProjectionCameraDecorator::create();
addRefCP (leftCamera) ;
beginEditCP(leftCamera);
{
leftCamera->setDecoratee(camera);
leftCamera->setEyeSeparation(0.5);
//leftCamera->setZeroParallaxDistance(15);
leftCamera->getSurface ().push_back (screenUpperRight);
leftCamera->getSurface ().push_back (screenUpperLeft);
leftCamera->getSurface ().push_back (screenLowerLeft);
leftCamera->getSurface ().push_back (screenLowerRight);
leftCamera->setLeftEye(true);
leftCamera->setUser (m_pUserBeaconNode);
}
endEditCP(leftCamera);
//right
osg::ProjectionCameraDecoratorPtr rightCamera =
osg::ProjectionCameraDecorator::create();
addRefCP( rightCamera );
beginEditCP(rightCamera);
{
rightCamera->setDecoratee(camera);
rightCamera->setEyeSeparation(0.5);
//rightCamera->setZeroParallaxDistance(15);
rightCamera->getSurface ().push_back (screenUpperRight);
rightCamera->getSurface ().push_back (screenUpperLeft);
rightCamera->getSurface ().push_back (screenLowerLeft);
rightCamera->getSurface ().push_back (screenLowerRight);
rightCamera->setLeftEye(false);
rightCamera->setUser (m_pUserBeaconNode);
}
endEditCP(rightCamera);
}
And this is all for the setup. As for the tracking, I am just doing some
tests, so I just pass to the user node some simple transformations:
void updateUserTransform ()
{
osg::Matrix m;
m.setTranslate (m_fPosX, m_fPosY, m_fPosZ);
beginEditCP (m_pUserTransformCore, osg::Transform::MatrixFieldMask);
m_pUserTransformCore->setMatrix (m);
endEditCP (m_pUserTransformCore, osg::Transform::MatrixFieldMask);
drawFrame ();
}
The problem is that when I call drawFrame, the camera does not change at
all. Probably I am missing something important,
But even looking at the doxigen files I can't figure it out what it could be
Thanks for any hint,
E.
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