This is an acurate hongawara buki roof tile system, that is most often used on japanese castles or traditional japanese structures.
All geometry information is stored as arrays and curves so that you can use the system on any size, or shape of roof. The individual tiles are simple and can easily be unwrapped without a problem. A few examples I've made that are included in the .blend are shown in the sample images.
Included are some samples of tile shapes I created, as well as a collection of primitives to help create any variety of roof style you need.
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