> 
> 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));

I use this:

#local vA=vnormalize(pE-pS);
#local vB=vnormalize(vcross(vA,<vA.y,vA.z,-vA.x>));

Unless pE=pS, vB will always be perpendicular to vA.

Regards,
John
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