I posted this in the general AutoCAD 2011 message board and I think this is a more appropriate place for this question.
I work for a solar PV company where we need to calculate how close we can place solar panels to obstructions on roofs or trees on the ground. We mostly do 2d drawings and dont do any rendering. The 3d work we do is to to measure shadows using real time and place cordinates.
The problem I havent been able to figure out is how to get the shadows to be really crisp in model space. The ground shadows will show up really clean but the shadows that fall on objects, such as hvac units or a roof that has a slope to it, are soft and distorted. I think it has something to do with the materials of the objects. Not really sure.
see the image below. The solar panels are blue. The roof is a sloped and white. The vent pipe is casting a shadow but I can't really use those shadow lines to determine how close I can get the panel, what would I measure too? Again there will be no rendering necessary. Thanks for any help.