jit.gen is 4 plane not adapting in order to provide the process of the 4 plane stuff coming into it.
and thus, it pops out vectors with 4 components EVEN if I'm still using (vec 0. 0. 0. ) object before output.
the fourh component is 0.0000
I can probably remove it with scissors..
but it would be smarter to avoid to have it.