Sun analysis

Hi!

I have a plot where I have to built something and I have some buildings around. I have created a volume with the same perimeter of the plot and with the maximum allowed height. Now I would like to model this volume throught the sun path because I dont want that my building blocks the sun to the other volumes. I know how to do it manually with the sun path but it's quite difficult. Do you know how can I do it in a automatic way? or at least in a simple way? Because right now I have to move the point of the sun path into every corner of the context buildings, it would be easier if I can consider lines instead of points.

Thanks a lot, and I would really appreciate if someone can help me.

:)