I analized the influence of Sun on my building with the Vasari Programme.
At the beginning you need to select the address of your project (my house, in this case) and to draw the volume of the building. In this part of the study the building are not so defined because we are not interested in the architecture of them, but in their exposition to the Sun.
Now that the buildings are done, with the command SUN SETTING, we can decide time and day of the study and see how shadows and lights "hit" the building.
I've controlled shadows at 11 2o and 15 20 of the 15/03/14.