Hi all, According to http://www.ros.org/wiki/tf/RotationMethods#btMatrix3x3 the btMatrix3x3 should support retrieving the roll pitch and yaw in both Fixed and Euler representations. However, when I looked in the header file in the bullet folder, the getRPY() method simply calls to getEulerRPY(). The two result in the same angles, only in reversed order. Is there an inconsistency between the tutorial and the code, or am I misinterpreting Euler vs Fixed rotations? Thanks, Ivan Dryanovski