My issue is that I don't exactly get how Ecotect calculates the shading mask in order to derive the radiation from the climate data. I have used the adjacencies trick too, without success. I am impressed by the speed of your reply so I am going to try my luck by copying a post I had sent a while ago on the Ecotect forum and has never been replied to.ฤก) solar incidence analysis: I have tested and retested solar incidence analysis without getting a consistent result out of it. I will check that out to see how can it help me, although I have the impression that I have tried it already. If you want to see shadows projected only onto specific objects, then simply select them and tag them as Shaded Surfaces using the Shadow Settings panel. If you meant shadows in the 3D EDITOR view, then this is just a wireframe model which defaults to showing just ground shadows.
Hence there is no right or wrong way of doing such an abstract representation, we just chose to show the full extent of each shadow's projection right down to the ground plane as this seemed to be what people most often expected to see. This is a highly abstract way of looking at things and something that you cannot possibly achieve in a physical world - but with a computer you can do pretty much anything. They will visually appear solid and opaque, but sunlight (and hence shadows) will travel right through.
However, when you choose to 'turn off' the shadows of some objects, you are effectively making those objects transparent to the Sun. Thus, when you do a normal shadow projection in Ecotect, the shadows should look fine. A point shaded by one opaque object is just as much 'in shade' as a point shaded by many opaque obstructions. The thing is you don't normally see this because of the shadow cast of the actual obstruction. In fact, shadows do penetrate right through other obstructions in their way. I am assuming you mean shadows in the OpenGL view (VISUALISE tab), in which case what you are describing occurs only when you choose to show the shadows only from objects you have specifically selected or assigned a different shadow colour.