hi all,
I want to draw axes in screen position,the axes can't be scaled or
transformed ,but which can be rotated with other scene.I do it like this,but
the billboard (texts: 'X','Y','Z') doesn't work,what should I do to make the
billboard work well？“axes.osg” is downloaded from the osg homepage.
osgViewer::Viewer viewer;
class orbit : public osg::NodeCallback
{
public:
orbit() {}
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osg::PositionAttitudeTransform *pat =
dynamic_cast<osg::PositionAttitudeTransform *>(node);
if( tx != NULL )
{
osg::Camera *camera=viewer.getCamera();
osg::Matrixd pMatrix = camera->getViewMatrix();
pat->setAttitude(pMatrix.getRotate());
}
}
};
osg::Group* fun()
{
osg::Group *group=new osg::Group();
osg::Node *axis=osgDB::readNodeFile("data\\axes.osg");
osg::PositionAttitudeTransform * tran = new osg::PositionAttitudeTransform;
tran->addChild(axis);
tran->setPosition(osg::Vec3(5,5,0));
tran->setUpdateCallback(new orbit());
osg::MatrixTransform* ModelViewMatrix = new osg::MatrixTransform;
ModelViewMatrix->setMatrix(osg::Matrix::identity());
ModelViewMatrix->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
ModelViewMatrix->addChild(tran);
osg::Projection* ProjectionMatrix = new osg::Projection;
ProjectionMatrix->setMatrix(osg::Matrix::ortho2D(0,10,0,10));
ProjectionMatrix->addChild(ModelViewMatrix);
group->addChild(ProjectionMatrix);
return group;
}
int _tmain(int argc, _TCHAR* argv[])
{
osg::Group *mRoot =fun();
viewer.setSceneData(mRoot);
return viewer.run();
}
best regards
forest
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