Графическое определение многоугольной поверхности

В принципе, для этого есть два варианта:

• If no structural lines are defined yet, a polygonal surface can be defined by menu bar → "Insert" → "Model Data" → "Surfaces" → "Plane" → "Graphically" → "Polygon", see Image 1.
  

  1 Многоугольник
• If structural lines are already defined, a polygonal surface can be defined by menu bar → "Insert" → "Model Data" → "Surfaces" → "Plane" → "Graphically" → "Select Boundary Lines", see Image 2.
  

  2 Выбрать граничные линии