BRepAdaptor_Curve* curve = arc_line->getCurve () ;
double len = arc_line->getLength ();
GCPnts_AbscissaPoint discret_start (*curve, len*arc_para1,
curve->FirstParameter() );
BRepAdaptor_Curve* curve = arc_line->getCurve () ;
double len = arc_line->getLength ();
GCPnts_AbscissaPoint discret_start (*curve, len*arc_para1,
curve->FirstParameter() );