title: How to get the camera rotation matrix out of the model view matrix
body: <p>If I have the modelview rotation matrix (which I also can use in glMultMatrixf(rtMatrix, 0) for example) then how can I calculate out of this the rotation around the virtual camera. I think converting the position t is just camPos=-1*t but how do I get the rotation around the camera when i have the rotation around the world center (which is the model view matrix right?)</p>