Illustration of the computational grid and the splitting of the domain Ω into a set of vertical sub-domains Ω_i, for which two exemplary columns Ω_i and Ω_j with discretization are depicted. We note that Ω_i are still 3D objects, while the actual computational domains are strictly 1D, extruded by the measure . Furthermore, the discrete area of influence ℛ_i ⊂ Γ_s around Ω_i is illustrated, within which the scattering of sunlight and thermal radiation of neighboring surface segments , j ≠ i, is considered.