Exposure Problem Galapagos and Geco

Hi, I´m using Galapagos to optimize the position of terrazes on a façade of a building and I´m using the "exposure" component to calculate the exposure on every terraze (mesh). I got the directon of the sun rays from "ecosunpath" and "ecosunrays" (Geco). As far as I know, the "exposure" component should consider the occlusion that other geometry may cause, but it seems it´s not working for me since Galapagos also puts terrazes on the façade where the shadow is projected.

How should I plug the obstructing geometry in the "O" input? 

Besides, Does the "exposure" component calculate the shadow that every terraze produce on every other one?

THX