Question 1) : You are trying to retrieve the Euler angles (i.e. rotation about X,Y,Z in some order) from a matrix. You can google for "Euler" and Matrix; alternatively start here:
http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToEuler/index.htm Question 2) : As mentioned in previous replies, the translation retrieved will incorporate the lookDistance of the camera; hence you need to store and control the lookDistance of the camera - this is a bit similar to the idea of "zoom" on the trackball. For what it's worth, I do this with a combination of distance = (eye-centre).length(), trackball->setDistance(distance), and also retrieve the matrix with trackball->getInverseMatrix().getLookAt(eye,look,up,distance). David
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