How can i devolop unity app like this

i saw a unity app [Planoplan] http://planoplan.com/cn/ can design room at runtime and it’s realy amazing, so please anybody tell me how does it make? thank you!

Prefabs and grids most likely. Prebuilt smaller units are modeled to fit each other and form rooms, walls and what not.

Hi, i’m the creator of Planoplan. Feel free to ask any questions about how it works. I will try to answer.