Various tools for modeling are available in RFEM. The modeling functions allow you to represent complex structures quickly and efficiently in the program. The connection of two circles or arcs, for example, can be generated with the "Tangent to Circles or Arcs" function.
If you want to connect members tangentially to a curved member or a curved surface in RFEM, it is necessary to define the member rotation of the connected members. In order to avoid manual determination, you can display the center point of the curved line and place a node on it. Then, you can select the "Member Rotation via Help node" option and specify the relevant help nodes. Thus, the members are rotated automatically in the defined plane (x-z in our example) and the top edge of the rotated cross-section is parallel to the tangent of the curved line.