[osg-users] Draw trackball (sphere with constant radius)

[Bruno Oliveira]

Hello,

I have a osg::viewer instance which I manipulate using
TrackballManipulator. I would like to draw the trackball sphere, which
cannot be done with this code because this sphere will be rescaled
everytime I scale my scene view using the mouse wheel:


m_rootNode = new osg::Group();

    // Add trackball sphere
    osg::ref_ptr<osg::Sphere> trackSphere = new osg::Sphere(
osg::Vec3(0,0,0), m_manipulator->getTrackballSize());
    osg::ref_ptr<osg::ShapeDrawable> trackSphereDrawable = new
osg::ShapeDrawable(trackSphere);
    osg::ref_ptr<osg::Geode> trackSphereGeode = new osg::Geode();
    trackSphereGeode->addDrawable(trackSphereDrawable);

    m_rootNode->addChild(trackSphereGeode);


How can I draw a trackball sphere that keeps its size in the window even
when I rescale my scene?
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