as recommended here, I used the internal coordinates of the floor to give the zone geometry. same as the walls.
I look at the model in visualization under OpenStuio, and as expected, there is a gap between two floors and between two zones or between two zones in the same floor. there is also a gap between an external wall and the shade surface next to it.
When I run the model, is the sun go trough this gaps? Hope it is not stupid question