just found where the problem is:
Viewer.cpp, line 1023: inside viewer.updateTraversals
if (_cameraManipulator.valid())
{
setFusionDistance( getCameraManipulator()->getFusionDistanceMode(),
getCameraManipulator()->getFusionDistanceValue() );
_camera->setViewMatrix(_cameraManipulator->getInverseMatrix());
}
So, at each frame the camera's matrix is overwritten by a new matrix which is
taken from MatrixManipulator.
I still wonder why viewer doesn't render anything at all (black image) if no
MatrixManipulator is set.
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=34702#34702
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