Selections
A staircase can consist of various elements, such as the steps(Steps), the vertical element between the steps (Risers), the struts under the steps(Stringers) and the lateral boundaries(Wall Stringers). In addition, it may make sense to cover the top surfaces(C1 and C2) and curves(R1 and R2) of the steps with separate materials. S stands for all polygons that are not on the sides of the stringer shapes. Predefined names are available here for all these areas, which can be linked to materials.