Is it simplest and good way I choosed ?

I have two points describing axis. I want find vector perpendicular to this axis
but it is not important where it points. So, is it good way?

  #local Axis=vnormalize(P1-P2);
  #local Vect=(abs(vdot(Axis,x))=1?vcross(Axis,y):vcross(Axis,x));

ABX
--
#declare _=function(a,b,x){((a^2)+(b^2))^.5-x}#default {pigment{color rgb 1}}
union{plane{y,-3}plane{-x,-3}finish{reflection 1 ambient 0}}isosurface{ //ABX
function{_(x-2,y,1)|_((x+y)*.7,z,.1)|_((x+y+2)*.7,z,.1)|_(x/2+y*.8+1.5,z,.1)}
contained_by{box{<0,-3,-.1>,<3,0,.1>}}translate z*15finish{ambient 1}}//POV35

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