So I am wondering, looking at the rpi photo, how one would tell their PCB software to route like that, with big areas instead of traces under the components. You can see the top left cap and diode (?) sit between areas. Should I create polygons and name them to the net of the component's connections for say EAGLE to make the big areas like that? Thanks.
Thanks westfw! I didn't know that before. This is neat! It seems that higher ranked polygons are pushed around by lower ranked ones. Top left is rank 2 and bottom left is rank 1, both rectangles but rank 2 is pushed around by rank 1.