Selecting only the roofs through many buldings

[user135]

Hi Guys
i wanna select only the roofs through many building in a part of city
is there any help?
roofs.gh (4.2 MB)

[fcegnam (Fernando Ceña)]

Hi,

try this, although for some volumes it may not work because of problems with the geometry.

Roofs_V1.gh (4.2 MB)