quat2car Select a unit vector in the quaternion rotation "quat2car returns a unit vector representing a principal axis of the rotation, which can be useful to accumulate positions of moving objects for example. Argument 'x', 'y', 'z, '-x', '-y' or '-z' specifies which axis is the 'front'"	from the library : quat Format : External Environment : max freeware Max 4.6 http://www.mat.ucsb.edu/~wakefield/soft/ http://www.mat.ucsb.edu/~wakefield/soft/quat_release.zip