For designing glass in the RF‑GLASS add‑on module, you can use one of two calculation methods: a 2D or a 3D calculation. The main difference of these design options is the automatic modeling of the layers in a temporary model. In a 2D calculation, each layer is generated as a surface element (plate theory), in a 3D calculation as a solid. Depending on the selected layer composition, you can either select an option or will find it preselected by the program.