The red tiles are based on real-life historical ~14th century château de Germolles’ tile designs. (https://en.wikipedia.org/wiki/Ch%C3%A2teau_de_Germolles)
Basically an extended texture of the red tile used on another model project of mine.
Workflow:
Blender (Model the tiles and arrange them onto a plane) -> Substance Painter (To bake high-poly to low-poly)
Sketchfab View