[osg-users] how to get model scale？

[forest37]

 
 hi all,
    When the secne is zoomed in or out ,I want to get the zoom scale.I do it 
like this:
    osg::Camera* camera= viewer.getCamera();
    osg::Matrix vm=camera->getViewMatrix();
    osg::Vec3 scale=vm.getScale();
 
    the result is that scale always equals to (1,1,1).What does this mean and 
how can I get the reall scale of the scene?
 
    thanks
 
best regards
 
forest
 
 
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