Quaterniond.setAngleAxis

Set this quaternion to a rotation equivalent to the supplied axis and angle (in radians). <p> This method assumes that the given rotation axis <code>(x, y, z)</code> is already normalized

@param angle the angle in radians @param x the x-component of the normalized rotation axis @param y the y-component of the normalized rotation axis @param z the z-component of the normalized rotation axis @return this