Another mode: If you would like to have a circular elements, we come to the aid of the command SEO (Solid Element Operation) - Intersection:
1. Model View (plan) through walls, make fence element desired shape (rectangular metal profiles)
2. Now create vault (arc, elliptical, any shape - Complex Profile) with an appropriate radius and put it in the right position in relation to previously constructed walls
3. Select the walls and vault and displays them in 3D box
4. Run SEO Target walls, vault operator, select Intersection and press Execute
5. Now put the dome on a invisible Layer and then show off. You see the finished fence element, which is not yet properly turned into the space. Select the Parallel Projection Settings> Settings Perspective> Side View and Azimuth 90 °> OK.
6. Fence components are now visible in the bird perspective. Select them, choose the command File> Libraries and Objects> Save 3D Model as .... Object (under Options> Non-editable binary 3D data, but if you later want to add an object parameter, select Editable GDL Script).
7. Use this object for the new fence installation. Looking at vertical sections from the inside, we see that they are not facing normal to the curvature of the auxiliary arch. In this case you should use the "sloping walls" instead of vertical.