This Generator builds buildings from ready-made blocks, in this case from a pack City Sample Buildings [www.fab.com].
You can create your building in any shape by setting the angle of the first corner block.
The first floor defines the shape of the entire building, and subsequent floors automatically adjust to this floor.
You can create buildings for both backgrounds and interiors, including columns, stairs, and an elevator with a cabin and adjustable collision.
A link to the project is in the video description.