4 + 1 versions

• M surfaces, P apertures in common, N points, with and without unit vector
• M surfaces, P apertures in common, integrate toroidally and vertically subdomain, without unit vector, break toroidal / vertical loop if any solid angle is > 0 (visibility test, and extract polygons)
• M surfaces, P apertures in common, integrate toroidally subdomain, using polygons, without unit vector

Optionnal:

• M surfaces, P apertures in common, integrate toroidally subdomain, using polygons, with unit vector, using user's function