7 lines (7 with data), 326 Bytes

    //AnyString loc = iffun(gtfun(sRel[0],.LengthProximal/2),"dist","prox");
    AnyString loc = iffun(gtfun(sRel[0],.Cut_Node.sRel[0]),"dist","prox");
    AnyDrawNode drw = 
    {
      RGB = {iffun(eqfun(.loc,"dist"),1.0,0.0),iffun(eqfun(.loc,"dist"),0.0,1.0),0.0};
      ScaleXYZ = {0.00035, 0.00035, 0.00035};
    };