This can be done using the HB_Radiance irradiance recipe, where you can input various grids.
Using the LB_IncidentRadiation what i usually do is separating beforehand the different surface types (Roofs, facades) and analyzing them separately (not with the same component but copying them 2, 3 times).
Thanks! i see, that makes sense. and always use in “context” the other parts not testing for.
for now I got it to work quite ok with the meshCP nodes (in this case from Impala plugIn).
Not too slow after all. I am testing for reference geometry (seperate meshes for roof,facade,ground) and sift the mesh faces from the incidentRadiation node accordingly.