I am confused as to how to calculate the "Area with Direct Line of Sight to the Outdoors via Vision Glazing (sq ft)" on the excel calculator form. They explain how to do it for View Type 1, specifically for 90 degree windows, however you need to calculate it for all rooms, including ones without 90 degree windows. How do you do that??? Why does it not specify how to do that? How do you find where to do that? Did i miss something?? Please help ASAP!!!