[SOFA] Returns the outer product of two pv-vectors
b. The parameters must have equal dimensions, of which
the first one must be equal to 2 and the second one to 3. The result
gets the same dimensions as the parameters.
If the position and velocity components of
(ap, av) and
(bp, bv), then the
result is the pair of vectors
(ap x bp, ap x bv + av x bp).