How do you add collision for a 3D building easily.

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:bust_in_silhouette: Asked By StarX1709

Hello,
Just to clear you that i already know how to add collision for buildings,but the things is that it takes a lot of time.Now i want to know is there any easy way for creating collsion for buildings which also have a window section.

:bust_in_silhouette: Reply From: kufyweruk

there is no easy way