Hi,
I am doing some exporments on Augmented Reality . In my programe i need to
display 3D OSG model and videos for a selected markers.
My marker traking lib is giving a 4X4 matrix. By setting this matrix to a
transformation matrix I am able to display OSG model on the marker.
But for the video I need to display on full screen or the same size as of video
. So I am not assigning any matrix to the transformation matrix. With this no
video displayed on the screen.
So I assigned a matrix statically to the transformation matrix then I am able
to see video on the screen. The code is given bellow
Code:
double temp_mat_1[16]={-0.999,0.003,0.011,0,
-0.010,-0.700,-0.713,0,
0.005,-0.713,0.700,0,
194.047,121.5,-276.475,1
};
mat.set(temp_mat_1);
videoTransMat->setMatrix(mat);
videoStrm ->seek(0);
videoStrm ->play();
Doing this way is making problem to me. Because I need to change the matrix
every time when the video resolution changes.
When I do a sample program to load video then it displayes with the same
resolution as of the video. In this program the transformation matrix does not
contain any thing. The code is given bellow
Code:
void main()
{
osg::ref_ptr<osg::ImageStream> mImageStream;
//osg::ref_ptr<osg::Texture> mVideoTexture;
osg::ref_ptr<osg::Texture2D> mVideoTexture;
osg::ref_ptr<osg::Geode> mVideoGeode;
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::Image* img;
img = osgDB::readImageFile("C:\\Test\\ar352wa.mp4.ffmpeg");
mImageStream = dynamic_cast<osg::ImageStream*>(img);
mVideoTexture = new osg::Texture2D;
mVideoTexture->setImage( mImageStream.get() );
geode->addDrawable(osg::createTexturedQuadGeometry(
osg::Vec3(0, 0, 0),
osg::Vec3(videoWidth, 0, 0),
osg::Vec3(0, 0, videoHeight)
));
geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, mVideoTexture,
osg::StateAttribute::ON );
osg::MatrixTransform * transformation = new osg::MatrixTransform();
transformation->addChild(geode.get());
mImageStream->play();
osgViewer::Viewer viewer;
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
viewer.setUpViewInWindow (200, 200, 600, 600);
viewer.setSceneData( transformation );
while(!viewer.done())
{
viewer.frame();
}
}
Can you please help me what modification i need to do to my AR program to
display the video.
AR Video Load code
Code:
img = osgDB::readImageFile(filename);
videoStrm = dynamic_cast<osg::ImageStream*>(img);
mVideoTexture = new osg::Texture2D;
geode = new osg::Geode;
mVideoTexture->setImage(videoStrm.get() );
float videoWidth = img->s()*img->getPixelAspectRatio() ;
float videoHeight =img->t();
geode->addDrawable(osg::createTexturedQuadGeometry(
osg::Vec3(0, 0, 0),
osg::Vec3(videoWidth, 0, 0),
osg::Vec3(0, 0, videoHeight)
));
geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, mVideoTexture,
osg::StateAttribute::ON );
videoTransMat = new osg::MatrixTransform();
videoTransMat->addChild(geode.get());
modelSwitch->addChild(videoTransMat);
AR Viewer Settings
Code:
viewer = new osgViewer::Viewer();
viewer->setUpViewInWindow (200, 200, videoXRes, videoYRes);
viewer->getCamera()->setViewport(0,0,videoXRes,videoYRes);
viewer->setLightingMode(osg::View::HEADLIGHT);
viewer->addEventHandler(new CSimpleWndSizeHandler(videoXRes,videoYRes));
/*p is projection matrix from camera*/
viewer->getCamera()->setProjectionMatrix(osg::Matrix(p));
Can you please help me what to do?
...
Thank you!
Cheers,
Koduri
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=47669#47669
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