I haven't tried it, but wouldn't changing the order of multiplication in the
get(Inverse)Matrix methods do the trick:
return osg::Matrixd::translate(osg::Vec3d(0.0, 0.0, m_distance))*
osg::Matrixd::translate(m_center)*
osg::Matrixd::rotate(M_PI_2-m_elevation, 1.0, 0.0, 0.0)*
osg::Matrixd::rotate(M_PI_2+m_heading, 0.0, 0.0, 1.0)*
osg::Matrixd::rotate(M_PI_2, 0.0, 1.0, 0.0); // NEW!
You essentially want the "m_center" point to rotate around the object in
addition to the camera-offset vector ("m_distance") rotating - that way you can
still pan, but the object would stay at the same location on the screen when
you're rotating. So apply both translations before/after the rotations,
instead of splitting them up.
Again, haven't tested this, just throwing the idea out.
Cheers,
Tom
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=32938#32938
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