Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the farm_buildings_generator zip. The add-on is listed as Farmstead Builder.

Usage

1. In Object Mode press Shift+A and choose Mesh, Farm Building, then pick a preset. You can also open the Farmstead tab in the 3D viewport sidebar (N) and press Add Building.
2. With a building selected, click the big picture in the sidebar to see every preset as a picture and pick one. The building changes in place.
3. Press Surprise for a random real-world farm building, or Vary to change the current one a little. The paint button picks new colors and the arrow button resets the building to its preset.
4. Open the sections below to change the shape (size, roof shape, pitch), walls and roofing, doors and windows, extras (cupolas, weathervanes, lean-tos, yard) and the finish (paint colors and weathering). Every change rebuilds the building live.
5. The Condition buttons on the first panel age the building: New, Used, Old or Derelict changes the paint, rust and dirt and adds real damage (missing boards, broken panes, patched or lifted roof sheets, a sagging ridge). The Weathering slider fine-tunes it.
6. Detail sets how round the curved parts are: Low for distant buildings and mobile games, High for close-ups.
7. The windpump wheel is animated: press Play to see it turn and set its speed in turns per minute.
8. Convert to Mesh turns a building into plain mesh objects for export (FBX, OBJ, glTF). Delete removes a building with all its parts.

Switch the viewport to Material Preview or Rendered to see the photo textures.